249+ CISCO Exams Questions and Answers with Explanation

Q:

Which command will create a dynamic pool named Todd that will provide you with 30 global addresses?

A) ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.240	B) ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224
C) ip nat pool todd 171.16.10.65 171.16.10.94 net 255.255.255.224	D) ip nat pool Todd 171.16.10.1 171.16.10.254 net 255.255.255.0

Answer & Explanation Answer: B) ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224

Explanation:

The command ip nat pool name creates the pool that hosts can use to get onto the global internet. What makes option B correct is that the range 171.16.10.65 through 171.16.10.94 includes 30 hosts, but the mask has to match 30 hosts as well, and that mask is 255.255.255.224 . Option C is wrong because there is a lowercase t in the pool name. Pool name are case sensitive.

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0 4927

Q:

Convert 10100010111101011001110110001011 2 to dotted decimal.

Answer

Convert to dotted hexadecimal first, and then convert each hexadecimal number pair to decimal.

A2.F5.9D.8B then 162.245.157.139

Workspace

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14 4906

Q:

Suppose you have a customer who has a central HQ and six branch offices. The customer anticipates adding six more branches in the near future. It whishes to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. which of the following would you recommend?

A) PPP	B) HDLC
C) Frame Relay	D) ISDN

Answer & Explanation Answer: C) Frame Relay

Explanation:

The key is "there are no free ports" on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.

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0 4830

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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1 4825

Q:

What switch must be added to the ipconfig command on a PC to verify DNS configuration?

A) /dns	B) -dns
C) /all	D) -all

Answer & Explanation Answer: C) /all

Explanation:

The /all switch must be added to the ipconfig command on a PC to verify DNS configuration.

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0 4821

Q:

What is the bit length and expression form of a MAC address?

Answer

48 bits (6 bytes) expressed as a hexadecimal number.

Workspace

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2 4780

Q:

The exhibit below shows the output of a show ip interface brief on a Cisco router.

r1#show ip interface brief

Serial0/0 does not respond to ping requests. What step would you take to resolve the problem?

A) Change ip address on Serial0/0	B) Enable the interface Serial0/0
C) Check the physical connection in Serial 0/0	D) The interface looks fine in status up, problem must be somewhere else

Answer & Explanation Answer: C) Check the physical connection in Serial 0/0

Explanation:

In order for an interface to work properly and respond to ping requests, both Status and Protocol must be up.

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Q:

Which switching technology reduces the size of a broadcast domain?

A) ISL	B) 802.1Q
C) VLANs	D) STP

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