Review Questions

1: Which UDP port number is used to access IGRP? 2: What is the maximum IGRP internetwork diameter, in hops? 3: What is the default update period for IGRP? 4: Why does IGRP specify an autonomous system number?

5: Referring to Figure 6.11, will the router McCloy advertise 192.168.1.0 as an interior, system, or external route? Similarly, as what type of route will Acheson advertise 172.16.0.0?

6: What is the default IGRP holddown time?

7: Which variables can IGRP use to calculate its composite metric?

8: How many entries can be carried within a single IGRP update packet?

Configuration Exercises

1: Write configurations for the six routers in Figure 6.25 to route to all subnets via IGRP. Use autonomous system number 50.

Figure 6.25. The internetwork for Configuration Exercises 1 through 3.

Figure 6.25. The internetwork for Configuration Exercises 1 through 3.

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2: Figures 6.26 through 6.29 show the outgoing interfaces for the route from subnet 192.168.2.96/27 to subnet 192.168.5.96/27. Assuming that IGRP is using the default bandwidth and delay metrics, calculate the composite metric of this route.

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