Final answer:
Routes received from external BGP peers are assigned an administrative distance value of 170.
Step-by-step explanation:
The BGP routes that are assigned an administrative distance value of 170 are routes received from external BGP peers. BGP (Border Gateway Protocol) is an exterior gateway protocol used for routing between autonomous systems. When a BGP router receives routes from external BGP peers, it assigns them an administrative distance value of 170. This value is used to determine the preference of routes when multiple routing protocols have routes to the same destination.