Network+ Routing Protocols and Concepts Flashcards

What is the primary purpose of a default route (0.0.0.0/0) in a routing table?

Answer: To forward packets when no more specific route exists

A default route (0.0.0.0/0) forwards packets when no more specific matching route exists in the routing table, acting as a catch-all gateway of last resort.

Which routing protocol is classified as an Exterior Gateway Protocol (EGP) used between autonomous systems on the internet?

Answer: BGP

BGP (Border Gateway Protocol) is the only widely used Exterior Gateway Protocol, designed to exchange routing information between different autonomous systems.

What metric does RIP (Routing Information Protocol) use to determine the best path to a destination?

Answer: Hop count

RIP uses hop count as its sole metric, with a maximum of 15 hops; any route with 16 or more hops is considered unreachable.

What is the purpose of administrative distance (AD) in IP routing?

Answer: To rank the trustworthiness of different routing information sources

Administrative distance ranks the trustworthiness of routing sources; when multiple protocols know a route, the router installs the one with the lowest AD.

What is the administrative distance of a directly connected network interface?

Answer: 0

Directly connected routes have an administrative distance of 0, making them the most trusted route source since the router is physically part of that network.

What type of routing requires a network administrator to manually enter each route into the routing table?

Answer: Static routing

Static routing requires manual configuration of routes by an administrator and does not adapt automatically to network topology changes.

Which Cisco IOS command displays the current IP routing table on a router?

Answer: show ip route

The 'show ip route' command displays the router's current routing table, including route sources, destinations, and next-hop addresses.