300-510 Question #256: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer is comparing these RPL and route map configurations. Which two conclusions will the engineer reach? (Choose two.)

Options

• ARPL is applying local preference 50 and community (2:666) for all prefixes, but the route map is
• BRPL and the route map are applying only local preference 50 for prefix 172.22.0.0/16.
• CRPL is applying local preference 50 and community (2:666) for prefix 172.22.0.0/16, but the route
• DRPL is applying local preference 100 and community (2:100) for multiple prefixes, but the route
• ERPL is applying policy only on BGP IPv6 address families, but the route map is applying policy on

Explanation

RPL is applying local preference 50 and community (2:666) for prefix 172.22.0.0/16, but the route map is applying only local preference 50 for the same prefix. The RPL configuration applies both local preference 50 and community (2:666, no-advertise) for the prefix 172.22.0.0/16. The route map, however, matches the same prefix using the prefix list LOW_LP_PREFIXES but only applies local preference 50. There is no community set in the route RPL is applying local preference 100 and community (2:100) for multiple prefixes, but the route map is applying default local preference for multiple prefixes. In the RPL configuration, prefixes other than 172.22.0.0/16 (i.e., in the else block) are assigned local preference 100 and community (2:100). The route map does not explicitly configure a local preference for unmatched prefixes, so the default BGP local preference (100) is applied. The key difference is that the RPL also sets a community (2:100) for the other prefixes, which is not applied by the route map.

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