Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 295

You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options are valid checks that should be performed first to verify proper OSPF operation? (Choose two.)

Answer options

• A. Are the ASBRs trying to redistribute the external routes into a totally stubby area?
• B. Are the ABRs configured with stubby areas?
• C. Is the subnets keyword being used with the redistribution command?
• D. Is backbone area (area 0) contiguous?

Correct answer: C, P, U

Explanation

The correct answer is C because using the subnets keyword is essential for redistributing external routes properly in OSPF. A is incorrect because ASBRs can redistribute into stub areas but not totally stubby areas. B is not a primary concern when troubleshooting external route visibility. D, while important for OSPF design, does not directly affect the visibility of external routes.