EIGRP

Question 1

What is EIGRP?

Answer 1

Cisco proprietary distance-vector routing protocol

Question 2

Features of EIGRP

Answer 2

Diffusing Update Algorithm (DUAL)
Establishing Neighbor Adjacencies
Reliable Transport Protocol
Equal and unequal cost load balancing

Question 3

Protocol used by EIGRP

Answer 3

Protocol-dependent modules (PDMs)

Question 4

Security in EIGRP

Answer 4

Supports authentication but does not encrypt the EIGRP routing updates

Question 5

EIGRP packet types

Answer 5

Hello , Update, Acknowledgement, Query, Reply

Question 6

EIGRP broadcast

Answer 6

Uses multicast and unicast
IPv4 - 224.0.0.10
IPv6 - FF02::A

Question 7

A packet type that is sent to initially exchange topology information or topology change. Contains needed routing information

Answer 7

Update Packets

Requires acknowledgement

Question 8

A “dateless” Hello packets used to indicate receipt of any EIGRP packet during a “reliable”

Answer 8

Acknowledgement Packet

Question 9

What packets require acknowledgement ?

Answer 9

update, query and reply packets

Question 10

2 Packets that used DUAL when searching for networks

Answer 10

Query and reply

Question 11

How to identify EIGRP

Answer 11

Autonomous System

Question 12

Passive Interface Command

Answer 12

Prevents neighbor relationships from being established

Routing updates from a neighbor are ignored

Question 13

EIGRP metrics

Answer 13

Bandwidth - Lowest
Delay - Cumulative
Reliability - Worsts
Load - Worsts

Question 14

Command used to Examine the values for EIGRP Metrics

Answer 14

show interfaces

Question 15

Purpose of Diffusing Update Algorithm (DUAL)

Answer 15

Provide the best and backup loop-free paths

Question 16

Neighboring router that is used for packet forwarding and is the least-cost route to the destination network

Answer 16

Successor

Question 17

Actual metric of a route from the current router. Lowest calculated metric to reach the destination network

Answer 17

Feasible Distance

listed in the routing table as the second number inside the brackets

Question 18

Are “Backup Paths” that are loop-free. Must comply to a feasibility condition

Answer 18

Feasible successor (FS)

Question 19

Called “advertised distance” the reported metric from the neighbor advertising the route

Answer 19

Reported Distance (RD)
if RD

Question 20

command to list all

successors and FSs to destination networks.

Answer 20

show ip eigrp topology

Question 21

Similarities is EIGRPv2 & v3

Answer 21

Same protocol number (88)
Maintains a topology table and queries if no FS are avail
Uses DUAL to calculate the successor routes

Question 22

Administrative Distance of internal, summary and external

Answer 22

90,5,170

Question 23

Which bandwidth value is used when calculating the EIGRP metric of a route?

Answer 23

the slowest bandwidth of all outgoing interfaces between the source and destination

Question 24

What two conditions will result in an EIGRP route going into the active state

Answer 24

The successor is down

There is no feasible successor.

Question 25

What information does EIGRP maintain within the routing table?

Answer 25

only successors

Question 26

What needs to be configured so that classless addresses will be advertised instead of classful addresses

Answer 26

No auto summary.

Auto summary will let the routing table summarize your networks

Question 27

IP range 1.0.0.0 to 126.0.0.0

Subnet mask: 255.0.0.0 /8 bits

Answer 27

Class A

Question 28

IP range 192.0.0.0 to 223.255.255.0

Subnet mask: 255.255.255.0 /24 bits

Answer 28

Class C

Question 29

IP range 128.0.0.0 to 191.255.0.0

Subnet mask: 255.255.0.0 /16 bits

Answer 29

Class B

Question 30

Which bandwidth value is used when calculating the EIGRP metric of a route?

Answer 30

the slowest bandwidth of all outgoing interfaces between the source and destination