Review

1: Why is it important to consider link capacities when designing redundancy?

2: Why is designing redundancy in the core easier than at other layers?

3: If all the core routers are in one building, what is a natural way to provide redundancy?

4: How many links on a ring core can fail before at least one section of the core is isolated?

5: Do ring designs provide consistent hop count through the core network when a link fails?

6: What ring technologies provide redundancy at Layer 2?

7: Do redundant ring technologies provide redundancy against failed devices?

8: Given a full mesh core with 25 routers, how many paths would there be through the network?

9: What method does a Cisco router use to differentiate between routes from two different routing protocols?

10: What is the first, and most important factor, used in deciding which route to use for a particular destination?

11: What mechanism in OSPF needs to be considered when it is being configured on a partial mesh network?

12: What are the possible techniques you can use in OSPF partial mesh network designs to get around this problem?

13: When dual homing a distribution layer or access layer router, what major problem should you be careful of?

14: When interconnecting distribution or access layer routers to provide redundancy, what issues should you be careful of?

15: What are the two main goals you must be careful to address when building redundancy into a network?

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