Cisco Enterprise Network Core Technologies (ENCOR) 2025 – 400 Free Practice Questions to Pass the Exam

The best path attribute that affects the selection based on the age of the route is the concept that prefers the oldest path when both paths are external (eBGP). This attribute is a part of the BGP decision process and is particularly relevant when multiple external BGP routes are available to reach a destination.

When BGP receives multiple routes to a destination from different external sources, it will consider the age of those routes as a deciding factor if both paths are from eBGP peers. BGP maintains the time each route has been present in its routing table. The logic here is that if two paths are learned from different external sources, choosing the older route can provide stability; it’s a way of ensuring that preference is given to paths that have been available for a longer time and are likely more stable.

The other options, while relevant to BGP, do not specifically address the selection based on the age of the route. For instance, the origin type relates to the source of the routing information but does not consider how long that information has been valid. Local preference determines the preferred path for outbound traffic but is not determined by age. The choice of eBGP over iBGP refers to the preference for external routes over internal ones but, again