What is the administrative distance of an EIGRP summary route?

The administrative distance of an EIGRP (Enhanced Interior Gateway Routing Protocol) summary route is 5. EIGRP summary routes are created to aggregate several routes into a single route, reducing the size of the routing table and improving network efficiency. The administrative distance is used to rate the trustworthiness of routing information received from different sources, with lower values being more trusted. Here’s how the provided options stand:

• 5 is the correct administrative distance for EIGRP summary routes, indicating a high level of trust.
• 20 is typically associated with external BGP (Border Gateway Protocol) routes.
• 90 is the administrative distance for internal EIGRP routes, those within the same autonomous system.
• 110 is the administrative distance for OSPF (Open Shortest Path First) routes.

Therefore, the administrative distance for an EIGRP summary route is 5.