jocker2

(μηπως λανθανω αγαπητε?ή να συνεχισω???)
ΣΥΝΕΧΙΣΕ ΠΑΣ ΚΑΛΑ!!!!!!!!
Ενα μελος του "φιλοσοφικου" αυτου κινηματος -όπως και συ πολυ σωστα ειπες δεν προκειται για θρησκεια,επομενως γιατι να καταπολεμαται απο την Ορθοδοξη εκκλησια αγαπητε?αφου μιλαμε ΜΟΝΟ για φιλοσοφια???-
ΔΙΟΤΙ ΜΕΣΑ ΣΤΗΝ ΕΚΚΛΗΣΙΑ ΓΙΝΟΝΤΑΙ ΣΦΑΛΜΑΤΑ ΚΑΙ ΛΑΘΗ ΑΣΥΝΧΟΡΙΤΑ ΚΑΙ ΑΡΧΙΣΕ ΝΑ ΧΑΝΕΙ ΑΡΚΕΤΟ ΚΟΣΜΟ ΚΑΙ ΠΡΟΣΠΑΘΕΙ ΝΑ ΒΡΙΣΚΕΙ ΤΑ ΛΑΘΗ ΣΤΟΥΣ ΑΛΛΟΥΣ ΚΑΙ ΝΑ ΜΗΝ ΒΛΕΠΕΙ ΤΑ ΔΙΚΑ ΤΗΣ.
με το που θα εστερνιστει τη Σαηεντολογια κανει τον παρακατω ορκο: "υποσχομαι..να τιμωρω με ολες τις δυναμεις που διαθετω οποιονδηποτε κακομεταχειριζεται ή εξευτελιζει την Σαηεντολοτζυ με επιζημιο τροπο...να εξουδετερωσω συκοφαντιες, προσβολες...κτλ κτλ..
ΦΥΣΙΚΑ ΔΕΝ ΕΧΕΙ ΤΕΤΟΙΟ ΟΡΚΟ Η ΣΑΗΕΝΤΟΛΟΓΙΑ. ΚΑΙ ΜΙΑ ΣΥΜΒΟΥΛΗ ΣΤΑΜΑΤΑ ΝΑ ΠΕΡΝΕΙΣ ΠΛΗΡΟΦΟΡΙΕΣ ΑΠΟ ΛΑΘΟς ΠΗΓΕΣ ΠΟΥ ΒΡΙΣΚΟΝΤΑΙ ΣΤΟ ΙΝΤΕΡΝΕΤ.
Επισης,να αναφερω οτι 4000 υπογραφες που μαζευτηκαν απο οικογενειες ατομων που ειχαν εστερνιστει τη ΣΑηεντολογια την εποχη του ΚΕΦΕ για το κλεισιμο της οργανωσεις...ηταν παρακινουμενοι απο την Εκκλησια της Ελλαδος κι οχι επειδη τα δικα τους προσωπα αρχισαν να ολισθαινουν και να οδηγουνται σε τελμα ετσι???Ολα συνομοσια της κακιας εξουσιαστικης εκκλησιας.....
Ο ΚΑΘΕΝΑΣ ΕΧΕΙ ΤΗΝ ΓΝΟΜΗ ΤΟΥ ΚΑΙ ΜΗΝ ΞΕΧΝΑΣ ΗΤΑΝ ΜΟΝΟ 4000 ΜΟΝΟ ΑΦΤΟΙ ΠΟΥ ΗΘΕΛΑΝ ΝΑ ΧΑΘΕΙ Η ΟΡΓΑΝΩΣΗ ΟΙ ΑΛΛΟΙ ΠΟΥ ΕΙΠΑΝ ΟΧΙ ΠΟΥ ΠΗΓΑΝ?
Φυσικα και η Σαηεντολογια δεν ευθυνεται για τον καθε "αποτυχημενο" ή "δυστυχη" που απευθυνεται σε αυτην ουτε φταιει αν καποιος δεν ειναι δυνατος χαρακτηρας και προβει σε αυτοκτονια ,για αυτο ΦΥΣΙΚΑ και τα μελη υπογραφουν υπευθυνη δηλωση οτι το τοτε ΚΕΦΕ νυν Εκκλησια της Σαηεντολογιας δε φερει καμια ευθυνη για τυχον αυτοκτονια ετσι???
Ο ΣΤΟΧΟΣ ΤΗΣ ΣΑΗΕΝΤΟΛΟΓΙΑ ΕΙΝΑΙ ΝΑ ΣΕ ΚΑΝΕΙ ΝΑ ΒΡΕΙΣ ΤΑ ΠΟΔΙΑ ΣΟΥ...
ΔΕΝ ΠΡΟΚΑΛΕΙ ΤΗΝ ΑΥΤΟΚΤΟΝΙΑ Ε? ΤΟΤΕ ΓΙΑΤΙ ΝΑ ΠΑΡΕΙ ΕΥΘΗΝΗ?
Η μηπως και αυτο συκοφαντια???
ΟΠΟΣ ΤΟ ΠΑΡΕΙ Ο ΚΑΘΕΝΑΣ...
Και επειδη ασχολησε με το θεμα αν δεν κανω λαθος ειπες σπουδαζεις...-ΔΛΔ εισαι ακομη στο σταδιο του "φοιτητη" ή του "επιμελητη"???-
ΔΕΝ ΣΠΟΥΔΑΖΩ ΑΛΛΑ ΠΡΟΚΟΙΤΕ ΝΑ ΚΑΝΩ ΤΗΝ ΣΠΟΥΔΗ ΚΑΙ ΑΣΧΟΛΟΥΜΕ ΑΡΚΕΤΑ ΜΕ ΤΟ ΘΕΜΑ.
πες μας αληθευει το γεγονος οτι τα μελη υπογραφουν συμφωνητικο προσφορας-αποδοχης εθελοντικης με αμειβομενης εργασιας με χρονικη διαρκεια ληξης με σκοπο τη διαδοση της "φιλοσοφιας" της Σαηεντολογιας???
ΟΧΙ. ΤΟ ΣΥΜΦΟΝΙΤΙΚΟ ΓΙΑ ΕΘΕΛΟΝΤΗΣ Ή ΓΙΑ ΑΜΟΙΒΟΜΕΝΗΣ ΕΡΓΑΣΙΑΣ ΕΙΝΑΙ ΔΙΑΦΟΡΕΤΙΚΑ ΣΥΜΒΟΛΕΑ.
ΚΑΙ ΦΥΣΙΚΑ ΚΑΙ ΤΑ 2 ΕΧΟΥΝ ΜΕΣΑ ΣΤΟ ΠΡΟΓΓΡΑΜΜΑ ΤΟΥΣ ΤΗΝ ΔΙΑΔΟΣΗ ΤΗΣ ΦΙΛΟΣΟΦΙΑΣ... ΟΠΟΣ ΟΤΙΔΙΠΟΤΕ...
Τελος,φρονω οτι θα ήταν καλο και σωστο εκ μερους σου να παραθεσεις δημοσιως το ερωτηματολογια που αναφερουν οι προηγουμενοι συνοδοιποροι αυτο το γνωστο των 200 ερωτηματων....γαι να δουμε ΟΛΟΙ για ΤΙ προκειται...
Φυσικα δεν πιστευω να σε ενοχλησει να παραθεσω ορισμενα απο τα ερωτηματα...μεχρι να μας το παραθεσεις ολοκληρο ετσι???
Ειναι αληθεια λοιπον αγαπητε πως υπαρχουν στο ερωτηματολογιο τα εξης ερωτηματα???(και θα παρακαλουσα οποιον εχει συμπληρωσει το εν λογω ερωτηματολογιο και ενθυμαται να μας απαντησει κι αυτος ή να μας παραθεσει την αποψη του).Ξεκινω...

-Οι πραξεις μου θεωρουνται απροβλεπτες απο τους αλλους?
-Θα μπορουσα να συμφωνησω στην αυστηρη πειθαρχια?
-Θα χρησιμοποιουσα σωματικη τιμωρια σε ενα παιδι 10 χρονων αν αρνιοταν να υπακουσει?
-Ευνοω φυλετικες και ταξικες διακρισεις?
-Αισθανομαι συχνα οτι οι αλλοι με κοιταζουν ή μιλανε για μενα πισω απο την πλατη μου?
-Εχω εναν ειδικο μίσος ή φοβο?
-καθομαι και σκεπτομαι συχνα για το θανατο την αρρωστια τον πονο τη λυπη?
-Με ανησυχει η ιδεα να χασω την αξιοπρεπεια μου?
-Εχω ταση να ζηλευω?
-Αισθανομαι συχνα απελπισμενος???
-Οι αλλοι με κανουν ο,τι θελουν?
-Συλλογιζομαι συχνα την κατωτεροτητα μου?
-Αισθανομαι οτι μερικες φορες η ηλικια μου ειναι αναντιον μου?
-Υπαρχουν περιοδοι κατα τις οποιες ειμαι θλιμμενος για οχι εμφανη λογο???

ΕΙΝΑΙ ΤΟ ΕΡΩΤΗΜΑΤΟΛΟΓΙΟ ΠΟΥ ΥΠΑΡΧΕΙ ΣΤΗΝ ΙΣΤΟΣΕΛΙΔΑ ΤΗΣ ΣΑΗΕΝΤΟΛΟΓΙΑΣ ΚΑΙ ΔΕΝ ΒΡΙΣΚΩ ΠΟΥ ΤΟ ΚΑΚΟ ΜΕ ΤΙΣ ΕΡΩΤΗΣΕΙΣ?
ΓΙΑΤΙ Η ΕΡΩΤΗΣΗ ΣΟΥ ΜΕΤΑ ΤΟ ΕΡΩΤΗΜΑΤΟΛΟΓΙΟ? ΙΣΟΣ ΤΟ ΕΡΩΜΑΤΟΛΟΓΙΟ ΥΠΟΣΤΗΡΙΖΕΙ ΟΣΑ ΕΙΠΕΣ ΠΡΙΝ? ΔΕΝ ΠΑΣ ΚΑΛΑ...
Οταν απαντησα πριν απο 4 χρονια αγαπητε στο εν λογω ερωτηματολογιο και ειδαν φυσικα πως ειμαι ενα "ευτυχισμενο και ισσοροπημενο ατομο" (προς Θεου δε βαζω ταμπελες στους ανθρωπους απλως θελω να δειξω την αντιδιαστολη του θεματος)μου ειπαν αυτοι οι "ειδικοι Σαηεντολογοι" πως αυθυποβαλλω τον εαυτο μου σε μια "ψευδη κατασταση ευτυχιας" και μου προτειναν αγαπητε να επαναλαβω το ιδιο τεστ αυτη τη φορα με τη βοηθεια του "μαγικου κουτιου" R METER!
Ακομη το χρησιμοποιειτε ή το καταργησατε???
Θες να εξηγησεις στους φιλους μας τη χρηση του???
ΦΥΣΙΚΑ ΥΠΑΡΧΕΙ, ΟΙ ΕΡΟΤΙΣΕΙΣ ΠΟΥ ΑΠΑΝΤΙΣΕΣ ΑΠΑΝΤΙΘΗΚΑΝ ΜΕ ΗΛΙΚΡΙΝΙΑ Ή ΜΥΠΟΣ ΠΡΟΣΠΑΘΟΥΣΕΣ ΝΑ ΜΕΞΕΙΣ ΛΙΓΟ ΤΟΝ ¨ΕΞΥΠΝΟ¨ ΟΠΟΣ ΚΑΙ ΜΕ ΤΙΣ ΕΡΩΤΙΣΕΙΣ ΣΟΥ?
Φυσικα αρνηθηκα...αλλα δυστυχως ημουν το μοναδικο ατομο...
ΑΝ ΠΕΡΙΜΕΝΕ Η ΣΑΗΕΝΤΟΛΟΓΙΑ ΑΠΟ ΣΕΝΑ...
Εσενα μπορει να "λυτρωθηκαν" να βοηθηθηκαν ατομα....αλλα δεν μας ειπες για ποσο καιρο συμβαινει αυτο...και ποσα ειναι τα ατομα που τελικα δεν βοηθουνται???
ΤΑ ΑΤΟΜΑ ΠΟΥ ΔΕΝ ΒΟΗΘΗΘΗΚΑΝ ΔΕΝ ΤΑ ΕΧΟ ΜΕΤΡΗΣΕΙ ΑΛΛΑ ΕΝΑ ΕΧΟ ΝΑ ΠΟ, ΤΑ ΔΙΚΑ ΜΟΥ ΑΤΟΜΑ ΠΗΓΑΝ ΓΙΑ ΝΑ ΚΑΝΟΥΝ ΕΝΑ ΣΥΓΚΕΚΡΙΜΕΝΟ ΚΕΦΑΛΑΙΟ ΑΠΟ ΤΗΝ ΣΑΗΕΝΤΟΛΟΓΙΑ ΚΑΙ ΤΩΡΑ ΚΑΤΑΛΗΞΑΝ ΝΑ ΘΕΛΟΥΝ ΝΑ ΤΕΛΙΟΣΟΥΝ ΟΛΗ ΤΗΝ ΣΠΟΥΔΗ, ΔΕΝ ΣΟΥ ΛΕΕΙ ΤΙΠΟΤΑ ΑΥΤΟ?
Γιατι δυστυχως εμενα ατομα του στενου μου οικογενειακου και φιλικου κυκλου εξαιτιας της Σαηεντολογιας αλλοι δεν υπαρχουν πλεον μαζι μας αλλοι εφτασαν στο χειλος του γκρεμου...και αυτοι πιστευαν πως για ενα χρονικο διαστημα οφελουνταν....οι μηπως τα ατομα που αναφερω εγω ήταν
"ΜΗ ΨΥΧΙΚΩΣ ΚΑΤΑΛΛΗΛΑ'να διεισδυσουν στους κλαδους της Σαηεντολογιας????
{ετσι τουλαχιστον μας ειπαν οι "εκπροσωποι και πρεσβευτες σας οταν τους ρωτησαμε 'γιατι'???"}
ΑΝ ΕΙΝΑΙ ΟΛΟΙ ΣΑΝ ΚΑΙ ΕΣΕΝΑ... ΜΗΝ ΑΚΟΘΣ ΤΟΥΣ ΔΙΑΦΟΡΟΥΣ ΚΑΙ ΜΗΝ ΔΙΑΒΑΖΕΙΣ ΟΤΙ ΣΟΥ ΛΕΝΕ, ΖΗΣΕ ΚΑΙ ΒΓΑΛΕ ΤΑ ΔΙΚΑ ΣΟΥ ΣΥΜΠΕΡΙΣΜΑΤΑ. ΞΕΚΙΝΑ
Δεν λεω ΦΥΣΙΚΑ πως ΜΟΝΟ η σαηεντολογια -οπως σου ειπα δεν ειμαι μονοπλευρη και μου αρεσει η πολυδαισταση αποψη των πραγματων- εκμεταλλευεται τον ανθρωπινο πονο και την ανθρωπινη αδυναμια....δυστυχως....ΟΛΟΙ το κανουν αυτο [:V]
ΔΕΝ ΕΚΜΕΤΑΛΛΕΥΟΝΤΑΙ ΤΟΝ ΠΟΝΟ ΑΛΛΑ ΤΟΝ ΑΠΑΛΥΝΟΥΝ

jocker
ΔΗΛ.
ΓΝΟΣΤΗ ΤΟΥ JOCKER ΜΕ ΨΕΥΔΟΝΥΜΟ FREE-SOUL= ΕΛΕΥΘΕΡΗ-ΨΗΧΗ.
ΣΑΣ ΕΥΧΑΡΙΣΤΩ

Τώρα όσον αφορά την διαβεβαίωση θα ήθελα καταρχάς μία αποστολή κειμένου στο e-mail μου, γραμμένο από κάποιον από τους γονείς ή κηδεμόνες σου και με τα στοιχεία ταυτότητάς του. Εάν είναι δυνατόν, και αυτό θα είναι προτιμότερο, ένα σκαναρισμένο γραμμένο κείμενο με υπογραφή και σκαναρισμένη την ταυτότητα. Μπορούμε να σου δώσουμε και αριθμό για να μας αποστείλεις ανάλογο FAX, που θα ήταν και το καλύτερο. Σε κάθε περίπτωση, θα πρέπει να έχουμε την διαβεβαίωση αυτή, είτε συμμετέχεις, είτε όχι και σε άλλα θέματα.

Με συγχωρείς για την όποια παραβίαση προσωπικών δεδομένων σου ζητώ, αλλά νομίζω πως είναι επιβεβλημένο σύμφωνα με τις συνθήκες.

ΤΟ ΕΧΩ ΨΑΞΕΙ ΚΑΙ ΔΕΝ ΧΡΕΙΑΖΕΤΕ ΤΙΠΟΤΑ!
Α ΚΑΙ ΕΓΙΝΑ 17!

10.1 Routed Protocol
10.1.1 Routable and routed protocols
A protocol is a set of rules that determines how computers communicate with each other across networks. Computers communicate with one another by exchanging data messages. To accept and act on these messages, computers must have definitions of how a message is interpreted. Examples of messages include those establishing a connection to a remote machine, e-mail messages, and files transferred over a network. A protocol describes the following: · The format that a message must conform to · The way in which computers must exchange a message within the context of a particular activity A routed protocol allows the router to forward data between nodes on different networks. In order for a protocol to be routable, it must provide the ability to assign a network number and a host number to each individual device. Some protocols, such as IPX, require only a network number because these protocols use the host's MAC address for the host number. Other protocols, such as IP, require a complete address consisting of a network portion and a host portion. These protocols also require a network mask in order to differentiate the two numbers. The network address is obtained by ANDing the address with the network mask. The reason that a network mask is used is to allow groups of sequential IP addresses to be treated as a single unit. If this grouping were not allowed, each host would have to be mapped individually for routing. According to the Internet Software Consortium, this would not be possible with the 162,128,000 hosts that are currently on the Internet.

10.1 Routed Protocol
10.1.2 IP as a routed protocol
The Internet Protocol (IP) is the most widely used implementation of a hierarchical network-addressing scheme. IP is a connectionless, unreliable, best-effort delivery protocol. The term connectionless means that no dedicated circuit connection is established prior to transmission as there is when placing a telephone call. IP determines the most efficient route for data based on the routing protocol. The terms unreliable and best-effort do not imply that the system is unreliable and does not work well, but that IP does not verify that the data reached its destination. This function is handled by the upper layer protocols. As information flows down the layers of the OSI model, the data is processed at each layer. At the network layer, the data is encapsulated into packets, also known as datagrams. IP determines the contents of the IP packet header, which includes addressing and other control information, but is not concerned with the actual data. IP accepts whatever data is passed down to it from the upper layers.

10.1 Routed Protocol
10.1.3 Packet propagation and switching within a router
As a packet travels through an internetwork to its final destination, the Layer 2 frame headers and trailers are removed and replaced at every Layer 3 device. This is because Layer 2 data units, frames, are for local addressing. Layer 3 data units, packets, are for end-to-end addressing. Layer 2 Ethernet frames are designed to operate within a broadcast domain using the MAC address that is burned into the physical device. Other Layer 2 frame types include Point-to-Point Protocol (PPP) serial links and Frame Relay connections, which use different Layer 2 addressing schemes. Regardless of the type of Layer 2 addressing used, frames are designed to operate within a Layer 2 broadcast domain, as the data crosses a Layer 3 device the Layer 2 information changes. As a frame is received at a router interface, the destination MAC address is extracted. The address is checked to see if the frame is directly addressed to the router interface, or if it is a broadcast. In either of these two cases, the frame is accepted. Otherwise, the frame is discarded since it is destined for another device on the collision domain. The accepted frame has the Cyclic Redundancy Check (CRC) information extracted from the frame trailer, and calculated to verify that the frame data is without error. If the check fails, the frame is discarded. If the check is valid, the frame header and trailer are removed and the packet is passed up to Layer 3. The packet is then checked to see if it is actually destined for the router, or if it is to be routed to another device in the internetwork. If the destination IP address matches one of the router ports, the Layer 3 header is removed and the data is passed up to the Layer 4. If the packet is to be routed, the destination IP address will be compared to the routing table. If a match is found or there is a default route, the packet will be sent to the interface specified in the matched routing table statement. When the packet is switched to the outgoing interface, a new CRC value is added as a frame trailer, and the proper frame header is added to the packet. The frame is then transmitted to the next broadcast domain on its trip to the final destination.

10.1 Routed Protocol
10.1.4 Internet Protocol (IP)
Two types of delivery services are connectionless and connection-oriented. These two services provide the actual end-to-end delivery of data in an internetwork. Most network services use a connectionless delivery system. Different packets may take different paths to get through the network, but are reassembled after arriving at the destination. In a connectionless system, the destination is not contacted before a packet is sent. A good comparison for a connectionless system is a postal system. The recipient is not contacted to see if they will accept the letter before it is sent. Also, the sender never knows whether the letter arrived at the destination. In connection-oriented systems, a connection is established between the sender and the recipient before any data is transferred. An example of a connection-oriented network is the telephone system. The caller places the call, a connection is established, and then communication occurs. Connectionless network processes are often referred to as packet switched processes. As the packets pass from source to destination, packets can switch to different paths, and possibly arrive out of order. Devices make the path determination for each packet based on a variety of criteria. Some of the criteria, such as available bandwidth, may differ from packet to packet. Connection-oriented network processes are often referred to as circuit switched processes. A connection with the recipient is first established, and then data transfer begins. All packets travel sequentially across the same physical or virtual circuit. The Internet is a gigantic, connectionless network in which all packet deliveries are handled by IP. TCP adds Layer 4, connection-oriented reliability services to IP.


10.1 Routed Protocol
10.1.5 Anatomy of an IP packet
IP packets consist of the data from upper layers plus an IP header. The IP header consists of the following: · Version – Indicates the version of IP currently used; four bits. If the version field is different than the IP version of the receiving device, that device will reject the packets. · IP header length (HLEN) – Indicates the datagram header length in 32-bit words. This is the total length of all header information, accounting for the two variable-length header fields. · Type-of-service (TOS) – Specifies the level of importance that has been assigned by a particular upper-layer protocol, eight bits. · Total length – Specifies the length of the entire packet in bytes, including data and header, 16 bits. To get the length of the data payload subtract the HLEN from the total length. · Identification – Contains an integer that identifies the current datagram, 16 bits. This is the sequence number. · Flags – A three-bit field in which the two low-order bits control fragmentation. One bit specifies whether the packet can be fragmented, and the other specifies whether the packet is the last fragment in a series of fragmented packets. · Fragment offset – Used to help piece together datagram fragments, 13 bits. This field allows the previous field to end on a 16-bit boundary. · Time-to-live (TTL) – A field that specifies the number of hops a packet may travel. This number is decreased by one as the packet travels through a router. When the counter reaches zero the packet is discarded. This prevents packets from looping endlessly. · Protocol – indicates which upper-layer protocol, such as TCP or UDP, receives incoming packets after IP processing has been completed, eight bits. · Header checksum – helps ensure IP header integrity, 16 bits. · Source address – specifies the sending node IP address, 32 bits. · Destination address – specifies the receiving node IP address, 32 bits. · Options – allows IP to support various options, such as security, variable length. · Padding – extra zeros are added to this field to ensure that the IP header is always a multiple of 32 bits. · Data – contains upper-layer information, variable length up to 64 Kb. While the IP source and destination addresses are important, the other header fields have made IP very flexible. The header fields are the information that is provided to the upper layer protocols defining the data in the packet.

10.2 IP Routing Protocols
10.2.1 Routing overview
Routing is an OSI Layer 3 function. Routing is a hierarchical organizational scheme that allows individual addresses to be grouped together. These individual addresses are treated as a single unit until the destination address is needed for final delivery of the data. Routing is the process of finding the most efficient path from one device to another. The primary device that performs the routing process is the router. The following are the two key functions of a router: · Routers must maintain routing tables and make sure other routers know of changes in the network topology. This function is performed using a routing protocol to communicate network information with other routers. · When packets arrive at an interface, the router must use the routing table to determine where to send them. The router switches the packets to the appropriate interface, adds the necessary framing information for the interface, and then transmits the frame. A router is a network layer device that uses one or more routing metrics to determine the optimal path along which network traffic should be forwarded. Routing metrics are values used in determining the advantage of one route over another. Routing protocols use various combinations of metrics for determining the best path for data. Routers interconnect network segments or entire networks. Routers pass data frames between networks based on Layer 3 information. Routers make logical decisions regarding the best path for the delivery of data. Routers then direct packets to the appropriate output port to be encapsulated for transmission. The encapsulation and de-encapsulation process occurs each time a packet transfers through a router. As shown in Figure 4, the process of sending data from one device to another involves the process of encapsulation and de-encapsulation. This process breaks up the data stream into segments, adds the appropriate headers and trailers then transmits the data. The de-encapsulation process is the opposite process, removing the headers and trailers, then recombining the data into a seamless stream. This course focuses on the most common routable protocol, which is the Internet Protocol (IP). Other examples of routable protocols include IPX/SPX and AppleTalk. These protocols provide Layer 3 support. Non-routable protocols do not provide Layer 3 support. The most common non-routable protocol is NetBEUI. NetBEUI is a small, fast, and efficient protocol that is limited to frame delivery within one segment.

10.2 IP Routing Protocols
10.2.2 Routing versus switching
Routing is often contrasted with switching. Routing and switching might seem to perform the same function to the inexperienced observer. The primary difference is that switching occurs at Layer 2, the data link layer, of the OSI model and routing occurs at Layer 3. This distinction means routing and switching use different information in the process of moving data from source to destination. The relationship between switching and routing parallels that of telephone local and long distance calls. When a telephone call is made to a number within the same area code, a local switch handles the call. However, the local switch can only keep track of its own local numbers. The local switch cannot handle all the telephone numbers in the world. When the switch receives a request for a call outside of its area code, it switches the call to a higher-level switch that recognizes area codes. The higher-level switch then switches the call so that it eventually gets to the local switch for the area code dialed. The router performs a function similar to that of the higher-level switch in the telephone example. Figure shows the ARP tables for Layer 2 addressing and routing tables for Layer 3 addressing. Each computer and router interface maintains an ARP table for Layer 2 communication. The ARP table is only effective for the broadcast domain (or LAN) that it is connected to. The router also maintains a routing table that allows it to route data outside of the broadcast domain. Each ARP table contains an IP-MAC address pair (the MAC addresses in the graphic are represented by the acronym MAC, as the actual addresses are too long to fit in the graphic). The routing tables also track how the route was learned (in this case either directly connected [C] or learned by RIP [R]), the network IP address for reachable networks, the hop count or distance to those networks, and the interface the data must be sent out to get to the destination network. The Layer 2 switch can only recognize its own local MAC addresses and cannot handle Layer 3 IP addresses. When a host has data for a non-local IP address, it sends the frame to the closest router, also known as its default gateway. The host uses the MAC address of the router as the destination MAC address. A Layer 2 switch interconnects segments belonging to same logical network or subnetwork. If Host X needs to send a frame to a host on a different network or subnetwork, Host X sends the frame to the router that is also connected to the switch. The switch forwards the frame to the router based on the destination MAC address. The router examines the Layer 3 destination address of the packet to make the forwarding decision. Host X knows the IP address of the router because the IP configuration of the router also includes the IP address of the default gateway. Just as a Layer 2 switch keeps a table of known MAC addresses, the router keeps a table of IP addresses known as a routing table. There is a difference between these two types of addresses. MAC addresses are not logically organized, but IP addresses are organized in a hierarchical manner. A Layer 2 device can handle a reasonable number of unorganized MAC addresses, because it will only have to search its table for those addresses within its segment. Routers need to handle a greater volume of addresses. Therefore, routers need an organized addressing system that can group similar addresses together and treat them as a single network unit until the data reaches the destination segment. If IP addresses were not organized, the Internet simply would not work. An example would be like a library that contained millions of individual pages of printed material in a large pile. This material is useless because it is impossible to locate an individual document. If the pages are organized into books and each page is individually identified, and the books are also listed in a book index, it becomes a lot easier to locate and use the data. Another difference between switched and routed networks is switched networks do not block broadcasts. As a result, switches can be overwhelmed by broadcast storms. Routers block LAN broadcasts, so a broadcast storm only affects the broadcast domain from which it originated. Because routers block broadcasts, routers also provide a higher level of security and bandwidth control than switches.

10.2 IP Routing Protocols
10.2.3 Routed versus routing
Protocols used at the network layer that transfer data from one host to another across a router are called routed or routable protocols. Routed protocols transport data across a network. Routing protocols allow routers to choose the best path for data from source to destination. A routed protocol functions include the following: · Includes any network protocol suite that provides enough information in its network layer address to allow a router to forward it to the next device and ultimately to its destination. · Defines the format and use of the fields within a packet The Internet Protocol (IP) and Novell's Internetwork Packet Exchange (IPX) are examples of routed protocols. Other examples include DECnet, AppleTalk, Banyan VINES, and Xerox Network Systems (XNS). Routers use routing protocols to exchange routing tables and share routing information. In other words, routing protocols enable routers to route routed protocols. A routing protocol functions includes the following: · Provides processes for sharing route information · Allows routers to communicate with other routers to update and maintain the routing tables Examples of routing protocols that support the IP routed protocol include the Routing Information Protocol (RIP), Interior Gateway Routing Protocol (IGRP), Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), and Enhanced IGRP (EIGRP).

10.2 IP Routing Protocols
10.2.4 Path determination
Path determination occurs at the network layer. Path determination enables a router to compare the destination address to the available routes in its routing table, and to select the best path. The routers learn of these available routes through static routing or dynamic routing. Routes configured manually by the network administrator are static routes. Routes learned by others routers using a routing protocol are dynamic routes.
The router uses path determination to decide which port an incoming packet should be sent out of to travel on to its destination. This process is also referred to as routing the packet. Each router that the packet encounters along the way is called a hop. The hop count is the distanced traveled. Path determination can be compared to a person driving a car from one location in a city to another. The driver has a map that shows the streets that can be taken to get to the destination, just as a router has a routing table. The driver travels from one intersection to another just as a packet travels from one router to another in each hop. At any intersection, the driver can route himself by choosing to turn left, turn right, or go straight ahead. In the same manner, a router decides which outbound port the packet should be sent.
The decisions of a driver are influenced by factors such as traffic on a road, the speed limit of the road, the number of lanes on the road, whether or not there is a toll on the road, and whether or not the road is frequently closed. Sometimes it is faster to take a longer route on a smaller, less crowded back street instead of a highway with a lot of traffic. Similarly, routers can make decisions based on the load, bandwidth, delay, cost, and reliability of a network link.
The following process is used during path determination for every packet that is routed:
· The destination address is obtained from the packet.
· The mask of the first entry in the routing table is applied to the destination address.
· The masked destination and the routing table entry are compared.
· If there is a match, the packet is forwarded to the port that is associated with that table entry.
· If there is not a match, the next entry in the table is checked.
· If the packet does not match any entries in the table, the router checks to see if a default route has been set.
· If a default route has been set, the packet is forwarded to the associated port. A default route is a route that is configured by the network administrator as the route to use if there are no matches in the routing table.
· If there is no default route, the packet is discarded. Usually a message is sent back to the sending device indicating that the destination was unreachable.

10.2 IP Routing Protocols
10.2.5 Routing tables
Routers use routing protocols to build and maintain routing tables that contain route information. This aids in the process of path determination. Routing protocols fill routing tables with a variety of route information. This information varies depending on the routing protocol used. Routing tables contain the information necessary to forward data packets across connected networks. Layer 3 devices interconnect broadcast domains or LANs. A hierarchical addressing scheme is required for data transfer to occur.
Routers keep track of important information in their routing tables, including the following:
· Protocol type – The type of routing protocol that created the routing table entry
· Destination/next-hop associations – These associations tell a router that a particular destination is either directly connected to the router, or that it can be reached using another router called the “next-hop” on the way to the final destination. When a router receives an incoming packet, it checks the destination address and attempts to match this address with a routing table entry.
· Routing metric – Different routing protocols use different routing metrics. Routing metrics are used to determine the desirability of a route. For example, the Routing Information Protocol (RIP) uses hop count as its only routing metric. Interior Gateway Routing Protocol (IGRP) uses a combination of bandwidth, load, delay, and reliability metrics to create a composite metric value.
· Outbound interfaces – The interface that the data must be sent out on, in order to reach the final destination.
Routers communicate with one another to maintain their routing tables through the transmission of routing update messages. Some routing protocols transmit update messages periodically, while others send them only when there are changes in the network topology. Some protocols transmit the entire routing table in each update message, and some transmit only routes that have changed. By analyzing the routing updates from the neighboring routers, a router builds and maintains its routing table

10.2 IP Routing Protocols
10.2.6 Routing algorithms and metrics
An algorithm is a detailed solution to a problem. In the case of routing packets, different routing protocols use different algorithms to decide which port an incoming packet should be sent to. Routing algorithms depend on metrics to make these decisions.
Routing protocols often have one or more of the following design goals:
· Optimization – Optimization describes the capability of the routing algorithm to select the best route. The route will depend on the metrics and metric weightings used in the calculation. For example, one algorithm may use both hop count and delay metrics, but may consider delay metrics as more important in the calculation.
· Simplicity and low overhead – The simpler the algorithm, the more efficiently it will be processed by the CPU and memory in the router. This is important so that the network can scale to large proportions, such as the Internet.
· Robustness and stability – A routing algorithm should perform correctly when confronted by unusual or unforeseen circumstances, such as hardware failures, high load conditions, and implementation errors.
· Flexibility – A routing algorithm should quickly adapt to a variety of network changes. These changes include router availability, router memory, changes in bandwidth, and network delay.
· Rapid convergence – Convergence is the process of agreement by all routers on available routes. When a network event causes changes in router availability, updates are needed to reestablish network connectivity. Routing algorithms that converge slowly can cause data to be undeliverable.
Routing algorithms use different metrics to determine the best route. Each routing algorithm interprets what is best in its own way. The routing algorithm generates a number, called the metric value, for each path through the network. Sophisticated routing algorithms base route selection on multiple metrics, combining them in a single composite metric value. Typically, smaller metric values indicate preferred paths.
Metrics can be based on a single characteristic of a path, or can be calculated based on several characteristics. The following are the metrics that are most commonly used by routing protocols:
· Bandwidth – The data capacity of a link. Normally, a 10-Mbps Ethernet link is preferable to a 64-kbps leased line.
· Delay – The length of time required to move a packet along each link from source to destination. Delay depends on the bandwidth of intermediate links, the amount of data that can be temporarily stored at each router, network congestion, and physical distance.
· Load – The amount of activity on a network resource such as a router or a link.
· Reliability – Usually a reference to the error rate of each network link.
· Hop count – The number of routers that a packet must travel through before reaching its destination. Each router the data must pass through is equal to one hop. A path that has a hop count of four indicates that data traveling along that path would have to pass through four routers before reaching its final destination. If multiple paths are available to a destination, the path with the least number of hops is preferred.
· Ticks – The delay on a data link using IBM PC clock ticks. One tick is approximately 1/18 second.
· Cost – An arbitrary value, usually based on bandwidth, monetary expense, or other measurement, that is assigned by a network administrator.

10.2 IP Routing Protocols
10.2.7 IGP and EGP
An autonomous system is a network or set of networks under common administrative control, such as the cisco.com domain. An autonomous system consists of routers that present a consistent view of routing to the external world.
Two families of routing protocols are Interior Gateway Protocols (IGPs) and Exterior Gateway Protocols (EGPs).
IGPs route data within an autonomous system.
· Routing Information Protocol (RIP) and (RIPv2)
· Interior Gateway Routing Protocol (IGRP)
· Enhanced Interior Gateway Routing Protocol (EIGRP)
· Open Shortest Path First (OSPF)
· Intermediate System-to-Intermediate System protocol (IS-IS)
EGPs route data between autonomous systems. An example of an EGP is Border Gateway Protocol (BGP).


10.2.8 Link state and distance vector
Routing protocols can be classified as either IGPs or EGPs, which describes whether a group of routers is under a single administration or not. IGPs can be further categorized as either distance-vector or link-state protocols.
The distance-vector routing approach determines the distance and direction, vector, to any link in the internetwork. The distance may be the hop count to the link. Routers using distance-vector algorithms send all or part of their routing table entries to adjacent routers on a periodic basis. This happens even if there are no changes in the network. By receiving a routing update, a router can verify all the known routes and make changes to its routing table. This process is also known as “routing by rumor”. The understanding that a router has of the network is based upon the perspective of the adjacent router of the network topology.
Examples of distance-vector protocols include the following:
· Routing Information Protocol (RIP) – The most common IGP in the Internet, RIP uses hop count as its only routing metric.
· Interior Gateway Routing Protocol (IGRP) – This IGP was developed by Cisco to address issues associated with routing in large, heterogeneous networks.
· Enhanced IGRP (EIGRP) – This Cisco-proprietary IGP includes many of the features of a link-state routing protocol. Because of this, it has been called a balanced-hybrid protocol, but it is really an advanced distance-vector routing protocol.
Link-state routing protocols were designed to overcome limitations of distance vector routing protocols. Link-state routing protocols respond quickly to network changes sending trigger updates only when a network change has occurred. Link-state routing protocols send periodic updates, known as link-state refreshes, at longer time intervals, such as every 30 minutes.
When a route or link changes, the device that detected the change creates a link-state advertisement (LSA) concerning that link. The LSA is then transmitted to all neighboring devices. Each routing device takes a copy of the LSA, updates its link-state database, and forwards the LSA to all neighboring devices. This flooding of LSAs is required to ensure that all routing devices create databases that accurately reflect the network topology before updating their routing tables.
Link-state algorithms typically use their databases to create routing table entries that prefer the shortest path. Examples of link-state protocols include Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS).

10.2.9 Routing protocols
RIP is a distance vector routing protocol that uses hop count as its metric to determine the direction and distance to any link in the internetwork. If there are multiple paths to a destination, RIP selects the path with the least number of hops. However, because hop count is the only routing metric used by RIP, it does not always select the fastest path to a destination. Also, RIP cannot route a packet beyond 15 hops. RIP Version 1 (RIPv1) requires that all devices in the network use the same subnet mask, because it does not include subnet mask information in routing updates. This is also known as classful routing.
RIP Version 2 (RIPv2) provides prefix routing, and does send subnet mask information in routing updates. This is also known as classless routing. With classless routing protocols, different subnets within the same network can have different subnet masks. The use of different subnet masks within the same network is referred to as variable-length subnet masking (VLSM).
IGRP is a distance-vector routing protocol developed by Cisco. IGRP was developed specifically to address problems associated with routing in large networks that were beyond the range of protocols such as RIP. IGRP can select the fastest available path based on delay, bandwidth, load, and reliability. IGRP also has a much higher maximum hop count limit than RIP. IGRP uses only classful routing.
OSPF is a link-state routing protocol developed by the Internet Engineering Task Force (IETF) in 1988. OSPF was written to address the needs of large, scalable internetworks that RIP could not.
Intermediate System-to-Intermediate System (IS-IS) is a link-state routing protocol used for routed protocols other than IP. Integrated IS-IS is an expanded implementation of IS-IS that supports multiple routed protocols including IP.
Like IGRP, EIGRP is a proprietary Cisco protocol. EIGRP is an advanced version of IGRP. Specifically, EIGRP provides superior operating efficiency such as fast convergence and low overhead bandwidth. EIGRP is an advanced distance-vector protocol that also uses some link-state protocol functions. Therefore, EIGRP is sometimes categorized as a hybrid routing protocol.
Border Gateway Protocol (BGP) is an example of an External Gateway Protocol (EGP). BGP exchanges routing information between autonomous systems while guaranteeing loop-free path selection. BGP is the principal route advertising protocol used by major companies and ISPs on the Internet. BGP4 is the first version of BGP that supports classless interdomain routing (CIDR) and route aggregation. Unlike common Internal Gateway Protocols (IGPs), such as RIP, OSPF, and EIGRP, BGP does not use metrics like hop count, bandwidth, or delay. Instead, BGP makes routing decisions based on network policies, or rules using various BGP path attributes.

10.3 The Mechanics of Subnetting
10.3.1 Classes of network IP addresses
Classes of IP addresses offer a range from 256 to 16.8 million hosts, as discussed previously in this module. To efficiently manage a limited supply of IP addresses, all classes can be subdivided into smaller subnetworks. Figure provides an overview of the division between networks and hosts.

10.3.2 Introduction to and reason for subnetting
To create the subnetwork structure, host bits must be reassigned as network bits. This is often referred to as ‘borrowing’ bits. However, a more accurate term would be ‘lending’ bits. The starting point for this process is always the leftmost host bit, the one closest to the last network octet.
Subnet addresses include the Class A, Class B, and Class C network portion, plus a subnet field and a host field. The subnet field and the host field are created from the original host portion of the major IP address. This is done by assigning bits from the host portion to the original network portion of the address. The ability to divide the original host portion of the address into the new subnet and host fields provides addressing flexibility for the network administrator.
In addition to the need for manageability, subnetting enables the network administrator to provide broadcast containment and low-level security on the LAN. Subnetting provides some security since access to other subnets is only available through the services of a router. Further, access security may be provided through the use of access lists. These lists can permit or deny access to a subnet, based on a variety of criteria, thereby providing more security. Access lists will be studied later in the curriculum. Some owners of Class A and B networks have also discovered that subnetting creates a revenue source for the organization through the leasing or sale of previously unused IP addresses.
A LAN is seen as a single network with no knowledge of the internal network structure. This view of the network keeps the routing tables small and efficient. Given a local node address of 192.168.10.14, the world outside the LAN sees only the advertised major network number of 192.168.10.0. The reason for this is that the local address of 192.168.10.14 is only valid within the LAN 192.168.10.0 and cannot function anywhere else.

10.3.3 Establishing the subnet mask address
Selecting the number of bits to use in the subnet process will depend on the maximum number of hosts required per subnet. An understanding of basic binary math and the position value of the bits in each octet is necessary when calculating the number of subnetworks and hosts created when bits were borrowed.
The last two bits in the last octet, regardless of the IP address class, may never be assigned to the subnetwork. These bits are referred to as the last two significant bits. Use of all the available bits to create subnets, except these last two, will result in subnets with only two usable hosts. This is a practical address conservation method for addressing serial router links. However, for a working LAN this would result in prohibitive equipment costs.
The subnet mask gives the router the information required to determine in which network and subnet a particular host resides. The subnet mask is created by using binary ones in the host octet or octets. The subnet octet or octets are determined by adding the position value of the bits that were borrowed. If three bits were borrowed, the mask for a Class C address would be 255.255.255.224. This mask may also be represented, in the slash format, as /27. The number following the slash is the total number of bits that were used for the network and subnetwork portion.
To determine the number of bits to be used, the network designer needs to calculate how many hosts the largest subnetwork requires and the number of subnetworks needed. As an example, the network requires 30 hosts and five subnetworks. A shortcut to determine how many bits to reassign is by using the subnetting chart. By consulting the row titled ”Usable hosts”, the chart indicates that for 30 usable hosts three bits are required. The chart also shows that this creates six usable subnetworks, which will satisfy the requirements of this scheme. The difference between usable hosts and total hosts is a result of using the first available address as the ID and the last available address as the broadcast for each subnetwork. The ability to use these subnetworks is not provided with classful routing. However, classless routing, which will be covered later in the course can recover many of these lost addresses.
The method that was used to create the subnet chart can be used to solve all subnetting problems. This method uses the following formula:
Number of usable subnets= two to the power of the assigned subnet bits or borrowed bits, minus two (reserved addresses for subnetwork id and subnetwork broadcast)
(2 power of borrowed bits) – 2 = usable subnets
(23) – 2 = 6
Number of usable hosts= two to the power of the bits remaining, minus two (reserved addresses for subnet id and subnet broadcast)
(2 power of remaining host bits) – 2 = usable hosts
(25) – 2 = 30

10.3.4 Applying the subnet mask
Once the subnet mask has been established it then can be used to create the subnet scheme. The chart in the Figure is an example of the subnets and addresses created by assigning three bits to the subnet field. This will create eight subnets with 32 hosts per subnet. Start with zero (0) when numbering subnets. The first subnet is always referenced as the zero subnet.
When filling in the subnet chart three of the fields are automatic, others require some calculation. The subnetwork ID of subnet zero is the same as the major network number, in this case 192.168.10.0. The broadcast ID for the whole network is the largest number possible, in this case 192.168.10.255. The third number that is given is the subnetwork ID for subnet number seven. This number is the three network octets with the subnet mask number inserted in the fourth octet position. Three bits were assigned to the subnet field with a cumulative value of 224. The ID for subnet seven is 192.168.10.224. By inserting these numbers, checkpoints have been established that will verify the accuracy when the chart is completed.
When consulting the subnetting chart or using the formula, the three bits assigned to the subnet field will result in 32 total hosts assigned to each subnet. This information provides the step count for each subnetwork ID. Adding 32 to each preceding number, starting with subnet zero, the ID for each subnet is established. Notice that the subnet ID has all binary 0s in the host portion.
The broadcast field is the last number in each subnetwork, and has all binary ones in the host portion. This address has the ability to broadcast only to the members of a single subnet. Since the subnetwork ID for subnet zero is 192.168.10.0 and there are 32 total hosts the broadcast ID would be 192.168.10.31. Starting at zero the 32nd sequential number is 31. It is important to remember that zero (0) is a real number in the world of networking.
The balance of the broadcast ID column can be filled in using the same process that was used in the subnetwork ID column. Simply add 32 to the preceding broadcast ID of the subnet. Another option is to start at the bottom of this column and work up to the top by subtracting one from the preceding subnetwork ID.

10.3.5 Subnetting Class A and B networks

The Class A and B subnetting procedure is identical to the process for Class C, except there may be significantly more bits involved. The available bits for assignment to the subnet field in a Class A address is 22 bits while a Class B address has 14 bits.
Assigning 12 bits of a Class B address to the subnet field creates a subnet mask of 255.255.255.240 or /28. All eight bits were assigned in the third octet resulting in 255, the total value of all eight bits. Four bits were assigned in the fourth octet resulting in 240. Recall that the slash mask is the sum total of all bits assigned to the subnet field plus the fixed network bits.
Assigning 20 bits of a Class A address to the subnet field creates a subnet mask of 255.255.255.240 or /28. All eight bits of the second and third octets were assigned to the subnet field and four bits from the fourth octet.
In this situation, it is apparent that the subnet mask for the Class A and Class B addresses appear identical. Unless the mask is related to a network address it is not possible to decipher how many bits were assigned to the subnet field.
Whichever class of address needs to be subnetted, the following rules are the same:
Total subnets = 2 to the power of the bits borrowed
Total hosts= 2 to the power of the bits remaining
Usable subnets = 2 to the power of the bits borrowed minus 2
Usable hosts= 2 to the power of the bits remaining minus 2






10.3.6 Calculating the resident subnetwork through ANDing
Routers use subnet masks to determine the home subnetwork for individual nodes. This process is referred to as logical ANDing. ANDing is a binary process by which the router calculates the subnetwork ID for an incoming packet. ANDing is similar to multiplication.
This process is handled at the binary level. Therefore, it is necessary to view the IP address and mask in binary. The IP address and the subnetwork address are ANDed with the result being the subnetwork ID. The router then uses that information to forward the packet across the correct interface.
Subnetting is a learned skill. It will take many hours performing practice exercises to gain a development of flexible and workable schemes. A variety of subnet calculators are available on the web. However, a network administrator must know how to manually calculate subnets in order to effectively design the network scheme and assure the validity of the results from a subnet calculator. The subnet calculator will not provide the initial scheme, only the final addressing. Also, no calculators, of any kind, are permitted during the certification exam.

Summary

An understanding of the following key points should have been achieved:
· Routed or routable protocol characteristics
· The steps of data encapsulation in an internetwork as data is routed to one or more Layer 3 devices
· Connectionless and connection-oriented delivery
· The IP packet fields
· Routers operate at the network layer. Initially, the router receives a Layer 2 frame with a Layer 3 packet encapsulated within it. The router must strip off the Layer 2 frame and examine the Layer 3 packet. When the router is ready to transmit the packet, the router then must encapsulate the Layer 3 packet in a new Layer 2 frame.
· Routed protocols define the format and use of the fields within a packet. Packets generally are conveyed from end system to end system.
· LAN switching occurs at Layer 2 of the OSI reference model, and routing occurs at Layer 3.
· Routing protocols are used between routers to determine paths and maintain routing tables. Routed protocols are used to direct user traffic.
· Routing involves two basic activities: determining the best routing paths and transporting packets through an internetwork.
· Routing algorithms process routing updates and populate the routing table with the best routes.
· Routing tables contain the best routes to all known networks. These routes can be either static routes, which are entered manually, or dynamic routes, which are learned through routing protocols.
· Convergence describes the speed at which all routers agree on a change in the network.
· Interior routing protocols route data within autonomous systems, while exterior routing protocols route data between autonomous systems.
· Routers using distance-vector routing protocols periodically send routing updates consisting of all or part of its routing table. Routers using link-state routing protocols use link-state advertisements (LSAs) to send updates only when topological changes occur in the network, and send complete routing tables much less frequently.
· The uses for subnetting
· How to determine the appropriate subnet mask for a given situation
· How to subnet Class A, B, and C networks
· How to use a subnet mask to determine the subnet ID

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