Realtime EIGRP Multiple Choice Questions And Answers For Freshers

6. What are the different packet types used by EIGRP?
The packet types used by EIGRP are:-
1. Hello - Neighborship is discovered and maintained by Hello Packets.
2. Acknowledgment - ACK packets are used to acknowledge the receipt of update, query and reply packets. Acknowledgment packets are Unicast.
3. Update - EIGRP uses Update messages to send Routing information to neighbors. Update packets can be sent to a single neighbor using unicast or to a group of neighbors using multicast.
4. Query - Query packets are used when EIGRP router has lost path (Successor) to a certain network and does not have any backup paths (Feasible Successor). Router sends query packets to its neighbors asking them if they have information about this particular network. Query packets are multicast.
5. Reply - Reply packets are used in response to the query packets. Reply packets are unicast to the originator of the query.

7. What is Reliable Transport Protocol?
EIGRP uses RTP (Reliable Transport Protocol) to deliver EIGRP packets between neighbors in a reliable and ordered way. If the packet with RTP enable sent, gets lost in the transit it will be send again (resend).

8. What packets are RTP enabled?
1.Update Packet.
2.Query Packet.
3.Reply Packet.

9. Explain what will happen if the packet is not acknowledged?
If a packet is not acknowledged, EIGRP will retransmit the packet to the non responding neighbor as a unicast. No other traffic is sent to this neighbor until it responds. After 16 unacknowledged re-transmissions, the neighbor is removed from the neighbor table.

10. Explain EIGRP Router ID?
In EIGRP, duplicate RIDs do not prevent routers from becoming neighbors and two EIGRP routers with the same router ID will still form a neighbor relationship. The only time the value of EIGRP RIDs consider is when injecting external (redistributed) routes into EIGRP. In this case, the routers injecting the external routes should have unique RIDs to avoid confusion.
To manually configures the router ID
R1(config)# router eigrp 10
R1(config-router)# eigrp router-id 1.1.1.1

Read More Questions:
EIGRP Interview Questions Part1
EIGRP Interview Questions Part2

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