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Chapter 3: Fundamentals of WANs and IP Routing 71
Step 3.
Compare the IP packet’s destination IP address to the routing table, and find the
route that best matches the destination address. This route identifies the outgo-
ing interface of the router and possibly the next-hop router IP address.
Step 4.
Encapsulate the IP packet inside a new data-link header and trailer, appropriate
for the outgoing interface, and forward the frame.
Figure 3-11 works through a repeat example of a packet sent by PC1 to PC2, followed by a
detailed analysis of each device’s routing logic. Each explanation includes the details about
how PC1 and each of the three routers builds the appropriate new data-link headers.
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