EIGRP

Question 1

When does EIGRP send full and partial updates?

Answer 1

Full on neighbor adjacency

Partial as needed when network topology changes

Question 2

What are the 2 primary timers for EIGRP?

Answer 2

Hello

Hold

Question 3

What are the default values for the Hello and Hold timers in EIGRP?

Answer 3

Hello = 5 seconds
Hold = 3xHello, or 15 seconds by default

Question 4

What are EIGRP’s 2 primary metrics?

Answer 4

Bandwidth and Delay

Question 5

What is the multicast address for EIGRP?

Answer 5

224.0.0.10

Question 6

Does EIGRP ever flood updates periodically?

Answer 6

No, only during adjacency setup or topology changes

Question 7

What are the 3 required and 1 optional attributes that must pass before an EIGRP adjacency will be established?

Answer 7

Required:

1. Same AS number
2. Same IP subnet
3. Matching K values

Optional:1. Authentication, if configured, must match.

Question 8

What is the Feasible Distance in EIGRP?

Answer 8

The metric of an EIGRP route on the local router.

Question 9

What is the Reported Distance in EIGRP?

Answer 9

The next-hop router’s best metric for a FD subnet

Question 10

What algorithm is used by EIGRP

Answer 10

DUAL

Question 11

What does DUAL stand for?

Answer 11

Diffusing Update ALgorithm

Question 12

Does the EIGRP ASN need to match between neighbors?

Answer 12

Yes

Question 13

Syntax to include interfaces into EIGRP

Answer 13

conf t
router eigrp ASN
network network [wildcard mask]

Question 14

What 3 attributes must match for EIGRP neighbors to become adjacent?

Answer 14

1. Same subnet
2. Same ASN
3. Matching K-values

Question 15

What is the all-EIGRP routers IPv6 address?

Answer 15

FF02::10

Question 16

What are the EIGRP k values, in order?

Answer 16

K1 = Bandwidth modifier
K2 = Load modifier
K3 = Delay modifier
K4 = Reliability modifier
K5 = Additional Reliability modifier

Question 17

2 steps to have EIGRP use a key chain in authentication

Answer 17

1. Under a given interface, set up authentication for the routing protocol.
2. Staying under that same interface, bind the key-chain that will be used to the auth line.

Question 18

Syntax to bind a key chain to EIGRP authentication

Answer 18

conf t
int gi1/0
ip authentication key-chain eigrp asn key-chain name

Question 19

Syntax to add automatic summarization to EIGRP

Answer 19

auto-summary

Question 20

Change the bandwidth or delay on an interface for EIGRP

Answer 20

conf t
int gi1/0
bandwidth value
delay value

Question 21

Syntax to set the hello and hold timers for EIGRP

Answer 21

conf t
int gi1/0
ip eigrp hello-interval seconds
ip eigrp hold-time seconds

Question 22

Configuration to allow for unequal cost load balancing in EIGRP

Answer 22

variance multiplier

Question 23

When you show the routing table, what letter signifies that route was learned via EIGRP?

Answer 23

D

Question 24

Syntax to set up authentication for eigrp under an interface.

Answer 24

conf t
int gi1/0
ip authentication mode eigrp asn md5

Question 25

What is the successor?

Answer 25

The successor is the path that has the best metric.

Question 26

What is the Feasible Distance?

Answer 26

The metric of a given route from the current router’s point of view.

Question 27

What is the Reported Distance?

Answer 27

The metric of a given route from the neighbor’s point of view.

Question 28

If a path meets the feasibility condition, but does not fall within variance parameters, what happens to it?

Answer 28

It is held in reserve as a feasible successor, one which may take over if the current successor fails.

Question 29

What is the feasibility condition?

Answer 29

The reported distance of a path must be less than the FD of the path on the current router.

Question 30

What happens to a path who’s FD falls within variance parameters but does not meet the feasibility condition?

Answer 30

It’s not installed in the routing table, nor will it be a Feasible Successor

Question 31

How does a router determine if a path can be a Feasible Successor?

Answer 31

If the path’s RD is less that the FD, it will be a Feasible Successor.