Networking Theory

Terms you'll need to understand:

✓ Open Systems Interconnection (OSI) model

✓ Peer-to-peer communication

✓ Transmission Control Protocol (TCP)

✓ Internetwork Packet Exchange (IPX)

✓ Split horizon

✓ Triggered updates

✓ Poison reverse

✓ Routing table

Techniques you'll need to master:

✓ Identifying and describing the functions of each layer of the OSI model

✓ Comparing IP and IPX, and explaining the protocols' functions

✓ Comparing TCP and UDP, and explaining the protocols' functions

✓ Convergence

✓ Distance vector

✓ Acknowledgment

✓ Fragmentation

✓ Maximum transmission unit (MTU)

✓ Handshaking

✓ Termination

✓ Using common routing commands on Cisco routers

✓ Understanding frame formats for IP, TCP, UDP, and IPX

This chapter addresses the CCIE blueprint objectives as laid out by the Cisco Systems CCIE program. Specifically, the chapter reviews the following topics:

► OSI model—Encompasses understanding the functions of the OSI model's layers and how each layer compares to the other layers.

► General routing concepts—Includes reviewing split horizon, poison reverse, recognizing the differences between switching and routing, the importance and techniques of route summarization, comparing link state versus distance vector protocols, discussing routing loops, understanding tunneling, and reviewing IP routing tables.

► Protocol operation—Includes understanding Windowing/Acknowledgments (ACK), fragmentation, maximum transmission units (MTU), handshaking, and termination.

► Protocol descriptions and use—Reviews Internet Protocol (IP), IP fragmentation, Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Internetwork Packet Exchange (IPX).

► IEEE802.x standards—Reviews the various 802.x protocol descriptions.

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