2. EIGPR Core Concepts

Question 1

What type of routing protocol is EIGRP?

Answer 1

Advanced Distance Vector

Question 2

What does Distance Vector mean?

Answer 2

Distance = cost
Vector = path

Question 3

What is DUAL?

Answer 3

The Diffusing Update Algorithm that identifies network paths and provides fast convergence by using precalculated loop free backup paths

Question 4

How is the topology table populated in EIGRP?

Answer 4

With help of the Protocol Dependant Modules

Question 5

What are Protocol Dependant Modules?

Answer 5

They allow EIGRP to support multiple L3 protocols like IPv4/v6

Question 6

What is the RTP?

Answer 6

Reliable Transport Protocol

Question 7

What does the RTP do?

Answer 7

Ensures the delivery of reliable packet types and takes action when ACK are not received as expected.

Question 8

What ar the RTP unreliable packets?

Answer 8

Hello and ACK

Question 9

What will happen if an ACK is not received?

Answer 9

RTP will retransmit up to 16 times

Question 10

What is the protocolnumber of EIGRP?

Answer 10

88

Question 11

What are the multicast addresses of EIGRP?

Answer 11

224.0.0.10 - 01:00:5e:00:00:0a

FF02::A - 33:33:00:00:00:0a

Question 12

How does EIGRP maintain its routes?

Answer 12

It creates its own Topology table and installs routes from the topology table into the routing table

Question 13

What is in the EIGRP topology table?

Answer 13

• Network prefix
• Neighbor that advertised the prefix
• Metris from each neighbor
• Values used to calculate the metric (total delay, minimum bandwith, load, reliability)