Question

a router learns of multiple toward the same destination. Which value in a routing table replesents the trustworthiness of learned routes and is used by the router to determine which route to install into the routing table for specific situation?

Answer 1

Final answer:

The Administrative Distance (AD) represents the trustworthiness of learned routes, and routers use it to decide which route to install in the routing table, with a lower AD being preferred.

Step-by-step explanation:

When a router learns of multiple routes toward the same destination, the value that represents the trustworthiness of these learned routes is known as the Administrative Distance (AD). The AD is used by routers to determine which route to install in the routing table when there are multiple routes to a single destination. A lower AD value is preferred over a higher one. For example, if Route A has an AD of 90 and Route B has an AD of 120, the router will choose Route A because it has the lower AD. Each routing protocol has a default AD; for instance, Directly connected interfaces have an AD of 0, EIGRP summary routes have an AD of 5, eBGP has an AD of 20, EIGRP has an AD of 90, OSPF has an AD of 110, IS-IS has an AD of 115, and RIP has an AD of 120.