ICND1 Routing Technologies & Protocols 5

Question 1

Which feature prevents routing loops in distance-vector protocols by not advertising a route back out the interface from which it was learned?

Accepted Answer

Split horizon

Answer

Split horizon prevents routing loops by prohibiting a router from advertising a route back on the same interface it was received from.

Question 2

An EIGRP router loses its successor route and there is no feasible successor. What process does EIGRP initiate?

Accepted Answer

It marks the route as possibly down and sends Query messages to neighbors

Answer

When no feasible successor exists, EIGRP enters Active state for that route and sends Query messages to all neighbors to find an alternative path.

Question 3

Which command configures a default route on a Cisco router and forwards traffic to next-hop 203.0.113.1?

Accepted Answer

ip route 0.0.0.0 0.0.0.0 203.0.113.1

Answer

A default static route uses the 0.0.0.0 0.0.0.0 network and mask to match all destinations not found in the routing table.

Question 4

What is the purpose of the OSPF dead interval?

Accepted Answer

The time after which a neighbor is declared down if no Hello is received

Answer

If a router does not receive a Hello from a neighbor within the dead interval, it declares that neighbor down and recalculates routes.

Question 5

Which command shows the routing protocol timers and networks configured on a Cisco router?

Accepted Answer

show ip protocols

Answer

The 'show ip protocols' command displays active routing protocols, their timers, networks, and administrative distance.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test