Review

1: Why is the topology of the network so important? Are the topology and the logical layout of a network the same thing?

2: Why are hierarchical networks built in "layers"?

3: Note the layer of the network in which each of these functions/services should be performed and why:

• Summarize a set of destination networks so that other routers have less information to process.

• Tag packets for quality of service processing.

• Reduce overhead so that packets are switched as rapidly as possible.

• Use a default route to reach internal destinations.

• Control the traffic that is admitted into the network through packet level filtering.

• Aggregate a number of smaller links into a single larger link.

4: What two factors is speed of convergence reliant on?

5: What types of controls should you typically place on an access layer router to block attacks from within the network?

6: What are the positive and negative aspects of a single router collapsed core?

7: What aspects of policy-based routing are different than the routing a router normally performs?

8: Should you normally allow directed broadcasts to be transmitted onto a segment?

9: What determines the number of routers participating in convergence?

10: Should a failing destination network in the access layer cause the routers in the core to recompute their routing tables?

11: What is the primary goal of the network core? What are the strategies used to reach that goal?

12: Why is optimum routing so important in the core?

13: What are the primary goals of the distribution layer?

14: What strategies are used in the distribution layer to achieve its goals?

15: What are the primary goals of the access layer?

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