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Q:

You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?

A) The routing tables on the switches will not update	B) The MAC forward/;filter table will not update on the switch
C) Broadcast storms will occur on the switched network	D) The switches will automatically load-balance between the two links

Answer & Explanation Answer: C) Broadcast storms will occur on the switched network

Explanation:

If spanning tree is disabled on a switch and you have redundant links to another switch, broadcast stroms will occur, among other possible problems.

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Q:

You want to run the new 802.1w on your switches. which of the following would enable this protocol?

A) Switch (config) # Spanning-tree mode rapid-pvst	B) Switch#spanning-tree mode rapid-pvst
C) Switch (config)#spanning-tree mode 802.1w	D) Switch#spanning-tree mode 802.1w

Answer & Explanation Answer: A) Switch (config) # Spanning-tree mode rapid-pvst

Explanation:

802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d

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Q:

Your switch has a port status LED that is alternating between green and amber. What could this indicate?

A) The port is experiencing errors	B) The port is shut down
C) The port is in STP blocking mode	D) Nothing, this is normal.

Answer & Explanation Answer: A) The port is experiencing errors

Explanation:

When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.

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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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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:

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:

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

A) The Lowest IP address of any physical interface	B) The Highest IP address of any physical interface
C) The Lowest IP address of any logical interface	D) The Highest IP address of any logical interface

Answer & Explanation Answer: B) The Highest IP address of any physical interface

Explanation:

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router . If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

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