Answers to Chapter 4 Review Questions
| 1: | What does hierarchy provide in a well-designed netork? |
| A1: | The foundation, or the skeleton on which everything else hangs. |
| 2: | What is the primary tool used to bound the area affected by network changes? |
| A2: | Summarization. |
| 3: | How can you determine which links can be removed from a fully-meshed core network to decrease the number of links? |
| A3: | By looking at the normal traffic patterns and determining which points the majority of the traffic will flow between. |
| 4: | What provides ways around failure points in the network? |
| A4: | Redundancy. |
| 5: | What two things are most desirable in a routing protocol? |
| A5: | Low overhead and fast convergence. |
| 6: | What can a routing protocol do to decrease it's burden to hosts that are not running routing on a network? |
| A6: | Use multicast or unicast routing updates, reduce the frequency of updates, and reduce the number of packets required to transmit the required information. |
| 7: | List the addressing problems that are caused by having multiple links to external networks. |
| A7: |
|
| 8: | Given the network shown in Figure 4-10, how many routes do you think a core router will have in its table if no summarization is applied? |
| A8: | 48 dial-ins, 95 remote sites, 8 links between the access and distribution layers, 6 common services networks, 9 HQ VLANs, 2 default routes, 3 routes to partner networks, 10 links from the core to other parts of the network, and 7 core network links. The total would be at least 179, not counting redundancy. |
| 9: | How many routes do you think a core router will have in its table if all possible summarization is done? |
| A9: | 9 summaries from routers outside the core, 10 links from the core to other parts of the network, and 7 core network links. The total would be around 26. |
| 10: | Define the core, distribution, and access layers of the network shown in Figure 4-11. |
| 11: | Correct any problems in the topology that will affect the stability of the network pictured in Figure 4-11. Explain the changes you make and why. |
| 12: | Address the network shown in Figure 4-11 in a way that reduces the routes in the core to a minimum. |
..................Content has been hidden....................
You can't read the all page of ebook, please click here login for view all page.