Final answer:
The default administrative distance for a directly connected route is 1, indicating a direct physical connection and high trustworthiness.
Step-by-step explanation:
The default administrative distance for a directly connected route is a. 1. This means that the router has a direct physical connection to the network in question, and therefore, it considers this path to be highly trustworthy. The administrative distance is a value that routers use to select the best path when there are two or more different routes to the same destination from two different routing protocols. Directly connected routes are always preferred over routes that must go through another router, hence they have the lowest administrative distance possible.