Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 34

Which of the following statements regarding OSPF routing updates on a point-to-point link is true?

Answer options

• A. On a point-to-point link, there is no need for a DR and BDR election; all routing updates are sent to 224.0.0.5.
• B. On a point-to-point link, a DR and BDR are elected. The DR sends link-state advertisements describing the network.
• C. On a point-to-point link, a DR and BDR are elected. To ensure resiliency, both the DR and BDR send link-state advertisements describing the network.
• D. On a point-to-point link, there is no need for a DR and BDR election. All routing updates are sent to the unicast address of the neighbor's interface.

Correct answer: A

Explanation

The correct answer is A because point-to-point links do not require a Designated Router (DR) or Backup Designated Router (BDR) election, as all routers directly communicate with each other. Options B and C are incorrect because they imply the need for DR and BDR elections on point-to-point links, which is not the case. Option D is also incorrect because it suggests using a unicast address instead of the multicast address 224.0.0.5 for routing updates.