Question 860
At New Teaching Block, a route appears in the BGP table but never enters the IP route table because next hop is unreachable. Which TWO responses together provide a direct implementation and a continuing safeguard for the stated risk? Select TWO answers.
Explanation
Correct Answers
This is the implementation element for the New Teaching Block case: A BGP advertisement may be valid but unusable without next-hop reachability. The specific action Provide a valid underlay path or justified next-hop policy for the advertised BGP prefix addresses the stated fault; the question also requires a persistent risk control.
This is the continuing risk-control element for New Teaching Block. Validate next-hop reachability when adding overlay transport changes prevents a future regression or unauthorized relaxation of the repair; it complements, rather than replaces, the implementation.
Incorrect Answers
This may be a configuration step for Default route selection: Default route 0.0.0.0/0 applies when no more specific IPv4 route matches. It does not resolve the BGP next-hop resolution requirement in New Teaching Block and is not one of the two controls requested. The direct mechanism here is a BGP advertisement may be valid but unusable without next-hop reachability
This may be an ongoing precaution for OSPF area membership: OSPF neighbors on a link must agree on essential area and protocol parameters. It does not resolve the BGP next-hop resolution requirement in New Teaching Block and is not one of the two controls requested. The direct mechanism here is a BGP advertisement may be valid but unusable without next-hop reachability