Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 339

An engineer configured routing between multiple OSPF domains and introduced a routing loop that caused network instability. Which action resolves the problem?

Answer options

• A. Set a tag using the redistribute command toward a domain and deny inbound in the other domain by a matching tag.
• B. Set a tag using the redistribute command toward a different domain and deny the matching tag when exiting from that domain.
• C. Set a tag using the network command in a domain and use the route-map command to deny the matching tag when exiting toward a different domain.
• D. Set a tag using the network command in a domain and use the route-map command to deny the matching tag when entering into a different domain.

Correct answer: A

Explanation

The correct answer is A because setting a tag with the redistribute command allows for controlled routing between the OSPF domains, and denying inbound traffic with a matching tag prevents routing loops. The other options do not effectively block the routes in the necessary direction to resolve the instability caused by the loops.