Exam JN0-664 topic 1 question 65 discussion

B,D correct. A - is wrong because if "orlonger" is used, then all /28 prefixes are advertised, hence no summarization happening

you set routing-options aggregate route 203.0.113.128/25 command to create a summary route and the protocol of this route is "Aggregate" , ofc this route's NH is "reject'. Then you must remove the protocol bgp this criteria from term 10 of export-policy.

The exact match in the route-filter only allows the route 203.0.113.128/25 to be advertised. By changing it to orlonger, all more-specific prefixes of 203.0.113.128/25 (e.g., /28 prefixes) will also match the policy

Correct A,D

AC, because the routes in the routing table are /28, hence it should be /25 or longer not /25 exact. Hence A is valid. All the routes in the routing table are BGP learnt routes, so no need to remove the BGP command from the export policy, as it will not make a difference. Since we want to summarise routes into a /25, we have to use the aggregate route, hence D is a valid answer.

You need to summarize routes so you need to use aggregate. Answer BD