Cisco
352-001 · Question #311
352-001 Question #311: Real Exam Question with Answer & Explanation
The correct answer is B: Enable mutual redistribution between OSPF and RIP on Router A and Router B using route tags.. Merging OSPF and RIP domains with dual border routers requires route tags and administrative distance tuning to guarantee both redundancy and loop-free redistribution.
Question
Refer to the exhibit. Company A is running a single-area OSPF, and Company B is running RIP as the IGP with no overlapping IP address spaces. Company A has just acquired Company B and both networks must be merged. Which three design components are recommended to guarantee connectivity and redundancy between the two networks? (Choose three.)
Exhibit
Options
- AEnable mutual redistribution between OSPF and RIP on one border router.
- BEnable mutual redistribution between OSPF and RIP on Router A and Router B using route tags.
- CIncrease the administrative distance to 130 for the OSPF external prefixes on Router A and
- DImplement an ACL on Router A and Router B to prevent OSPF external routes from being
- EFilter external routes on Router A and Router B based on route tags.
Explanation
Merging OSPF and RIP domains with dual border routers requires route tags and administrative distance tuning to guarantee both redundancy and loop-free redistribution.
Common mistakes.
- A. Configuring redistribution on only one border router eliminates redundancy, violating the explicit design requirement for redundancy between the two merged networks.
- D. Blocking all OSPF external routes with an ACL would prevent legitimate redistributed prefixes from being advertised, breaking connectivity between the two networks rather than simply preventing loops.
Concept tested. Mutual redistribution with route tags to prevent routing loops
Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13659-17.html
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