Question 1

What is administrative distance (AD), and what does a lower AD value indicate?

Accepted Answer

Administrative distance is a rating of the trustworthiness of a routing information source, with values from 0 to 255. A lower AD value indicates a more preferred (more trustworthy) route.

Question 2

What is the administrative distance of a directly connected route?

Accepted Answer

A directly connected route has an administrative distance of 0, making it the most trusted source of routing information.

Question 3

What is the administrative distance of a static route configured on a Cisco router?

Accepted Answer

A static route has a default administrative distance of 1, making it preferred over all dynamic routing protocols.

Question 4

When two routing protocols learn a route to the same destination, what determines which route is installed in the routing table?

Accepted Answer

The route from the protocol with the lowest administrative distance is installed in the routing table. If ADs are equal, the metric is used as a tiebreaker.

Question 5

What is a floating static route, and how is it created?

Accepted Answer

A floating static route is a backup static route that only becomes active if the primary route fails. It is created by assigning it an AD higher than the primary routing protocol's AD.

CCNA Routing Protocols

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