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ICND EIGRP Multiple Questions.

 
 

Question 1:

Refer to the exhibit, when running EIGRP what is required for R1 to exchange routing updates with R3?

EIGRP multiple= 

A.  AS numbers must be changed to match on all the routers
B.  Loopback interfaces must be configured so a DR is elected
C. The no auto-summary command is needed on R1 and R3
D.  R2 needs to have two network statements, one for each connected network

Answer: A

Explanation :

EIGRP uses autonomous system (AS) numbers to identify the collection of routers that share route information. Only router that have the same autonomous system (AS) numbers share routing information.

 So, R1 AS have to be configured with AS 300.
 

Question 2:

As a Cisco technician, you need to know EIGRP protocol very well. Which of the following is true about EIGRP successor routes? (Choose two)

A.  A successor route is used by EIGRP to forward traffic to a destination
B.  Successor routes are stored in the neighbor table following the discovery process
C.  Successor routes are flagged as "active" in the routing table
D.  A successor route may be backed up by a feasible successor route

Answer: A D

Explanation:

A and D are correct because successor route is the best and primary route to a remote network. A successor route is used by EIGRP to forward traffic to a destination and is stored in the routing table. Its backed up by a feasible successor route in case the primary route fails, that is stored in the topology table.

B is incorrect because neighbor table only contains a list of directly connected EIGRP routers that have an adjacency with this router, it doesn't contain successor routes.

C is incorrect because successor routes found in the routing table are not flagged as "active”
 
 

Question 3:

Which two statements are true regarding EIGRP? (Choose two)

A - Passive routes are in the process of being calculated by DUAL
B - EIGRP supports VLSM, route summarization, and routing update authentication
C - EIGRP exchanges full routing table information with neighboring routers with every update
D - If the feasible successor has a higher advertised distance than the successor route, it becomes the primary route
E - A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information

Answer:  B E

Explanation:

B  is correct because EIGRP Support VLSM, route summarization, and routing update authentication. These are the outstanding features of EIGRP and

E is correct because when a route fails and has no feasible successor, EIGRP uses Diffusing Update Algorithm (DUAL) to discover and replace a failed route which will be added to the routing table.

 A is incorrect because Diffusing Update Algorithm (DUAL) is used by EIGRP  for the selection and maintainance of the best path to each remote network. DUAL tracks all the routes advertised by neighbors and selects routes based on feasible successors. It inserts lowest cost paths into the routing table .

C is incorrect because. EIGRP sends a partial routing table update,especially when there is a change in the network topology. Although this is one of the features of a link state protocol like OSPF which is one of the reason why EIGRP is called a hybrid protocol, it’s still a distance-vector protocol.



 
 
 


 
 
 
 
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