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LAN Switching Concepts

A modern Ethernet LAN connects user devices as well as servers into some switches, with
the switches then connecting to each other, sometimes in a design like Figure 7-1. Part of the
LAN, called a campus LAN, supports the end user population as shown on the left of the
figure. End user devices connect to LAN switches, which in turn connect to other switches
so that a path exists to the rest of the network. The campus LAN switches sit in wiring closets
close to the end users. On the right, the servers used to provide information to the users
also connects to the LAN. Those servers and switches often sit in a closed room called a
data center, with connections to the campus LAN to support traffic to/from the users.
Free CISCO CCNA Routing and Switching ICND1 Study Guide
Figure 7-1 Campus LAN and Data Center LAN, Conceptual Drawing

To forward traffic from a user device to a server and back, each switch performs the same
kind of logic, independently from each other. The first half of this chapter examines the
logic: how a switch chooses to forward an Ethernet frame, when the switch chooses to not
forward the frame, and so on.

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