Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 343

Under which circumstance does BGP ignore the best-path algorithm after receiving multiple routes to a destination?

Answer options

• A. when the routes have local-preference values less than 100
• B. when the route’s first hop has a different AS number
• C. when the route’s next hop is unreachable
• D. when the routes are synchronized

Correct answer: C

Explanation

BGP will ignore the best-path algorithm when the next hop of a route is unreachable, as it cannot use that route. The other options do not cause BGP to disregard the best-path selection; local-preference values below 100, different AS numbers for the first hop, and synchronized routes do not prevent BGP from evaluating routes.