Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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David is a network administrator in his organization. He has configured OSPF on a router with both physical and logical interfaces. Which of the following factors would determine the router ID?
  1. The highest IP address of any interface.
  2. The highest IP address of any logical interface.
  3. The highest IP address of any physical interface.
  4. The lowest IP address of any logical interface.
Explanation
Answer: B - The router ID is determined by the highest IP address of any logical interface.

Key Takeaway: An OSPF process running in Cisco IOS requires a router-wide unique router ID. An IP address of an active interface is commonly used as the OSPF router ID. If the OSPF router ID has not been selected in the first step, IP addresses of all other applicable interfaces are collected. OSPF router IDs of active OSPF processes are removed from the list and the highest IP address is used.
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