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Q:

What is the purpose of Spanning Tree Protocol in a switched LAN?

A) To provide a mechanism for network monitoring is switched environments B) To prevent routing loops in network with redundant paths
C) To prevent switching loops in networks with redundant switched paths D) To manage the VLAN database across multiple switches
 
Answer & Explanation Answer: C) To prevent switching loops in networks with redundant switched paths

Explanation:

The Spanning Tree Protocol (STP) was designed to stop layer 2 loops. All Cisco switches have the STP on by default.

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Filed Under: CCNA

Q:

When is redistribution required for EIGRP?

Answer

Redistribution is required when more than one EIGRP session or process is running and they are identified with different ASNs. Redistribution shares topology information between EIGRP sessions.

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Subject: CCNA

Q:

What four routed protocols are supported by EIGRP?

Answer

The four routed protocols supported by EIGRP are IP, IPv6, IPX, and AppleTalk.

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Subject: CCNA

Q:

There are three possible routes for a router to reach a destination network. The first route is from OSPF with a metric of 782. The second route is from RIPv2 with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which route will be installed by the router in its routing table?

A) RIPv2 B) EIGRP
C) OSPF D) All three
 
Answer & Explanation Answer: B) EIGRP

Explanation:

Only the EIGRP routes will be placed in the routing table because it has the lowest administrative distance (AD), and that is always used before metrics.

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Q:

Where are EIGRP successor routes stored?

A) In the routing table only B) In the neighbor table only
C) In the routing table and neighbor table D) In the routing table and the topology table
 
Answer & Explanation Answer: D) In the routing table and the topology table

Explanation:

Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are found only in the topology table and used as backup routes in case of primary route failure.

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Filed Under: CCNA

Q:

You get a call from a network administrator who tells you that he typed the following into his router:

Router (config) #router ospf 1

Router (config-router) # network 10.0.0.0. 255. 0.0.0 area 0

He tells you he still can't see any routes in the routing table. What configuration error did the administrator make?

A) The wildcard mask is incorrect B) The OSPF area is wrong
C) The OSPF Process ID is incorrect. D) The AS configuration is wrong
 
Answer & Explanation Answer: A) The wildcard mask is incorrect

Explanation:

The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255 or even 0.255.255.255.

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Q:

A network administrator needs to configure a router with a distance-vector protocol that allows classless routing. Which of the following satisfies those requirements?

A) IGRP B) OSPF
C) RIPv1 D) EIGRP
 
Answer & Explanation Answer: D) EIGRP

Explanation:

In this question, we're calling EIGRP just plain old distance vector. EIGRP is an advanced distance-vector routing protocol, sometimes called a hybrid routing protocol because it uses the characteristics  of both distance-vector and link-state routing protocols.

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Q:

You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers  need to be  checked. What command will display the required information?

A) show ip eigrp adjacency B) show ip eigrp topology
C) show ip eigrp interfaces D) show ip eigrp neighbors
 
Answer & Explanation Answer: D) show ip eigrp neighbors

Explanation:

The show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit  interval and queue counts for the neighbors that have established an adjacency.

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Filed Under: CCNA