Which statement regarding BGP route selection rules is true?

Which statement regarding BGP route selection rules is true?

• A. The route with the higher local preference is preferred
• B. A summarized route is preferred over a non-summarized route
• C. The priorities of three Origin attributes types are in the following order: EGP, IGP, Incomplete
• D. Among the equal-cost routes, the route with the shorter Cluster-List is preferred

Answer: (A)

The statement about BGP route selection rules indicating that the route with the higher local preference is preferred is accurate. In Border Gateway Protocol (BGP), local preference is a well-known attribute used to influence outbound routing decisions within a single autonomous system (AS). When a router receives multiple routes to a particular destination, it uses local preference to determine which route should be selected. A higher local preference value is favored over a lower one, meaning that if two routes exist to the same destination, the route with the higher local preference will be used to forward packets. This approach allows network administrators to manually influence the path selection in their AS, which can be useful for traffic engineering and optimizing routes based on policies set by the organization. The local preference attribute serves as a key tool for managing how data is routed out of an AS, thereby affecting overall network performance and efficiency. Regarding the other statements, while they relate to route selection and attributes in BGP, they do not hold in the same manner as the statement about local preference. For instance, while summarized routes can simplify routing, BGP does not inherently prefer them over non-summarized routes without additional context. Similarly, the order of origin types is indeed significant in BGP, but it is not

The statement about BGP route selection rules indicating that the route with the higher local preference is preferred is accurate. In Border Gateway Protocol (BGP), local preference is a well-known attribute used to influence outbound routing decisions within a single autonomous system (AS). When a router receives multiple routes to a particular destination, it uses local preference to determine which route should be selected. A higher local preference value is favored over a lower one, meaning that if two routes exist to the same destination, the route with the higher local preference will be used to forward packets.

This approach allows network administrators to manually influence the path selection in their AS, which can be useful for traffic engineering and optimizing routes based on policies set by the organization. The local preference attribute serves as a key tool for managing how data is routed out of an AS, thereby affecting overall network performance and efficiency.

Regarding the other statements, while they relate to route selection and attributes in BGP, they do not hold in the same manner as the statement about local preference. For instance, while summarized routes can simplify routing, BGP does not inherently prefer them over non-summarized routes without additional context. Similarly, the order of origin types is indeed significant in BGP, but it is not