Exam 300-420 topic 1 question 24 discussion

D. Use an IP prefix list to block the desired networks and apply the IP prefix list to BGP neighbors inbound. To meet the design conditions, the engineer should create an IP prefix list that blocks prefixes with a subnet mask greater than /24, and apply the IP prefix list to BGP neighbors inbound. This will filter out undesired networks and ensure that the routers will only learn prefixes with a subnet mask of /24 or less. This selection will be made based on the length of the mask alone, and it will be independent of the service provider's configuration.

Provided Answer is correct * The routers will determine the routes to include in the routing table based on the length of the mask alone. ==> prefix list == length of mask alone , otherwise route-map is always more versatile