
Chapter 2: What Is a Computer Network?
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segments of a network are down. A router can redirect data traffic around a
congested network segment to ensure that it reaches its destination in a timely
manner. Routers also are used to connect LANs to WANs using digital subscriber
line (DSL), Integrated Services Digital Network (ISDN), Frame Relay, or
dedicated leased lines (T1/E1 or T3/E3 private lines).
Chapter 4, “Network Foundation Technologies—Switching and Routing,”
provides a more in-depth discussion of switching, routing, and hubs.
Types of Networks
A fundamental way to characterize a network is by size. Using this method,
the most common types of ...