Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 7

Which of the following statements regarding the router ID in OSPF are incorrect? (Choose three)

Answer options

• A. The router IDs of OSPF routers in the same area must be the same, but can be different in different areas.
• B. The router ID must be the IP address of an OSPF router interface.
• C. The router ID must be configured manually.
• D. A router running OSPF must have a router ID for it to operate properly.

Correct answer: A, B, C

Explanation

Option A is incorrect because router IDs must be unique within an OSPF area, not the same. Option B is wrong as the router ID does not have to be an IP address of an interface; it can be any 32-bit number. Option C is also incorrect because if a router ID is not manually configured, OSPF can automatically assign one based on the highest IP address of its active interfaces.