This chapter covers the following topics that you will need to master as a CCNA:
·
The OSI, TCP/IP, and NetWare Protocol Architectures
This section describes
the history of OSI and its relevance to networking in the new millennium. In addition,
this section covers the meaning and usefulness of each layer, the interactions of the
layers, and the encapsulation of data.
·
OSI Transport Layer Functions
Routers and switches are mainly concerned with
protocols similar to the OSI network and data link layers, and sometimes with the
transport layer. This section covers the pertinent details of the transport layer,
including connectionless and connection-oriented operation, error recovery, flow
control, buffering, and windowing.
·
OSI Data Link Layer Functions
Routers, switches, and bridges use data link layer
concepts, both on LAN and WAN connections. This section discusses the data link
functions of arbitration, addressing, error detection, and encapsulation.
·
OSI Network Layer Functions
The network layer defines the core concepts used
by routers. This section discusses network layer addressing and routing in depth.
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