Cisco CCNA mock exam questions sample test – Question 43

.Which Enhanced Interior Gateway Routing Protocol (EIGRP) packet type is used for neighbor discovery?

A. Hello
B. Update
C. Queries
D. Replies

Correct Answer: A

Explanation:
Hello packets are used for neighbor discovery. These are sent as multicasts and do not require an acknowledgement.
Update packets are sent to communicate the routes used by a router to converge. When a new route is discovered or the convergence process is completed, updates are sent as
multicast. During topology table synchronization, updates are sent as unicasts to neighboring peers.
Query packets are sent when a router performs route computation and cannot find a feasible successor. These packets are sent to neighboring peers asking if they have a feasible
successor to the destination network.
Reply packets are sent in response of a query packet. These are unicast and sent to the originator of the query.
Objective:
Routing Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot EIGRP for IPv4 (excluding authentication, filtering, manual summarization, redistribution, stub)