Figure 14-5 shows two
LANs (Atlanta and Cincinnati), a WAN link between the two routers, and the
routing tables of each router. People typically use a lightning bolt type of line to
represent a WAN link, as shown in the figure. Note also that R1 is using its
serial0 interface, abbreviated s0 in the figure, and R2 is using its serial1
interface, abbreviated s1.
Now take a closer look at the routing tables in Figure 14-5. Comparing this internetwork to
the one in Chapter 11, Figure 11-13, the only
physical difference is that there is now a WAN link between the routers instead
of an Ethernet. The routing tables differ in what outgoing interfaces they list.
For example, R1's route to 150.1.3.0 lists an outgoing interface of S0, with a
next-hop IP address of 150.1.2.2.
Now that we have an established internetwork to talk about, the
next sections explain three topics related to the WAN data link layer and IP
routing. In order, you'll read about WAN data link framing, WAN data link
addressing, and the two most popular WAN data link protocols: HDLC and PPP.
Sections
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