OSPF Tuning & Verification

Covers Lesson 5 and Lesson 6

Checks that you can predict which path OSPF prefers, who leads a shared segment, and how to localise a fault from the right command in the right order.

Topics covered

• Cost, reference bandwidth, and the cost-1 tie
• DR/BDR election, priority, and non-preemption
• Injecting a default route into OSPF
• The verification order and each fault fingerprint

Every question here is answerable from the first-party notes of the lessons above. You commit to an answer before you see whether it was right.

This quiz is a Week 5 milestone in its own right. Passing it does not change the completion state of any individual lesson, and you do not need it to finish the lessons it covers.

Section quiz

OSPF Tuning & Verification

8 questions covering Lesson 5 and Lesson 6. Answer each one before you see whether you were right.

Question 1 of 8

1. How is an OSPF interface cost calculated by default?

2. Under the default reference bandwidth, what cost does a 1 Gbps interface have, and why is that a problem?

3. How is the Designated Router elected on a broadcast segment?

4. A DR is already elected. You raise another router's priority above it. What happens?

5. On which link type does no DR/BDR election happen?

6. What does default-information originate require before it advertises anything?

7. What is the first OSPF verification command, and why that one?

8. Two routers are FULL, but one remote LAN is missing from the other's table. Which family of fault is this?

Back to Lesson 6 Continue to Lesson 7

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