| 1 | Write EIGRP configurations for Routers A, B, and C in Figure 7-41. Use process ID 5.

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| 2 | The serial interfaces connecting Routers A and B in Figure 7-41 are both S0. Configure authentication between these two routers, using the first key two days from today's date. Configure a second key to be used beginning 30 days after the first key.

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| 3 | Router D is added in Figure 7-42. Add this router to the configurations written in Configuration Exercise 2. |
| 4 | Router F has been added in Figure 7-43. Configure this router to run EIGRP with the routers configured in Configuration Exercises 2 and 3.
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| 5 | Configure route summarization wherever possible in the network of Figure 7-43. |