Chapter 18. Routing and Layer 2/3 Switches
This book is primarily concerned with communication between devices that are connected to the same LAN. But it also is important to understand the role and operation of routers, which carry traffic to and from LANs. This is especially true because of the increasing use of Layer 2/3 switches, which bridge some types of traffic and route other types.
This chapter provides an overview of the functions that are performed by routers. It also explains what Layer 2/3/4 and application-layer switches are.
Because of its widespread use, the IP protocol is used as the basis of examples that describe the types of functions that a router performs. Recall that the IP protocol data unit, which consists of a header ...
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