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CompTIA Network+ Certification Exam

 

QUESTION 111

After recent changes to the pictured network, several users are unable to access the servers. Only PC1, PC2, PC3, and PC4 are clickable and will give you access to the command prompt and the adapter configuration tabs.

 

Instructions:

Verify the settings by using the command prompt, after making any system changes. Next, restore connectivity by making the appropriate changes to the infrastructure. When you have completed these steps, select the Done button to submit.

 

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Correct Answer:

The default gateway must be on the same network as the nodes that use it. Therefore, the subnet on PC3 and the default gateway on PC4 must be modified.

 

References:

Dulaney, Emmett and Mike Harwood, CompTIANetwork+ Authorized Exam Cram, Fourth Edition, Pearson, Indianapolis, 2012, p 101.

http://www.subnetonline.com/pages/subnet-calculators/ip-subnet-calculator.php

 

 

 

QUESTION 112

After connecting a workstation directly to a small business firewall, a network administrator is trying to manage it via HTTPS without losing its stored configuration. The only two pieces of information that the network administrator knows about the firewall are the management interface MAC address, which is 01:4a:d1:fa:b1:0e, and the administrator’s password. Which of the following will allow the administrator to log onto the firewall via HTTPS if the management’s IP address is unknown and the administrator’s workstation IP address is 192.168.0.10/23?

 

A.

Use the reset button on the back of the firewall to restore it to its factory default, and then log onto

B.

Run the following command on the administrator’s workstation: arp -s 192.168.1.200 01:4a:d1:fa:b1:0e

C.

Use an SNMP tool to query the firewall properties and determine the correct management IP address

D.

Use a crossover cable to connect to the console port and reconfigure the firewall management IP to 192.168.0.1

 

Correct Answer:
B

Explanation:

Address Resolution Protocol (ARP) is used to resolve IP addresses to MAC addresses. The arp -s command addsa static permanent address to the ARP cache. This will allow the administrator to access the firewall.

 

 

QUESTION 113

A company has changed ISPs for their office and ordered a new 250 Mbps symmetrical Internet connection. As a result, they have been given a new IP range. The ISP has assigned the company 10.10.150.16 /28. The company gateway router has the following interface configuration facing the ISP:

 

Interface A:

IP address: 10.10.150.16

Subnet mask: 255.255.255.240

Default gateway: 10.10.150.32

Speed: 1000 Mbps

Duplex: Auto

State: No Shutdown

 

None of the workstations at the company are able to access the Internet. Which of the following are the reasons? (Select TWO).

 

A.

There is a duplex mismatch between the router and ISP.

B.

B.The router interface is turned off.

C.

The interface is set to the incorrect speed.

D.

The router is configured with the incorrect subnet mask.

E.

The router interface is configured with the incorrect IP address.

F.

The default gateway is configured incorrectly.

 

Correct Answer: EF

Explanation:

According to the IP Address Range Calculator, for the given subnet mask and the IP range address range assigned by the ISP, the first host address should be 10.10.150.17 and the broadcast address should be 10.10.150.31. Therefore, the router interface is configured with the incorrect IP address and the default gateway is configured incorrectly.

 

QUESTION 114

A PC technician has installed a new network printer that was preconfigured with the correct static IP address, subnet mask, and default gateway. The printer was installed with a new cable and appears to have link activity, but the printer will not respond to any network communication attempts. Which of the following is MOST likely the cause of the problem?

 

A.

Damaged cable

B.

Duplex mismatch

C.

Incorrect VLAN assignment

D.

Speed mismatch

 

Correct Answer: C

Explanation:

If a port is accidentally assigned to the wrong VLAN in a switch, it’s as if that client was magicallytransported to another place in the network. This would explain the inability to communication with the printer, as it is on a different VLAN.

 

 

QUESTION 115

A network technician has received a help desk ticket indicating that after the new wireless access point was installed, all of the media department’s devices are experiencing sporadic wireless connectivity. All other departments are connecting just fine and the settings on the new access point were copied from the baseline. Which of the following is a reason why the media department is not connecting?

 

A.

A.Wrong SSID

B.

Rogue access point

C.

Placement

D.

Channel mismatch

 

Correct Answer: C

Explanation:

The sporadic wireless connectivity is being caused by interference. Moving the access point to adifferent location would solve the problem.

 

 

QUESTION 116

While troubleshooting a network outage, a technician finds a 100-meter fiber cable with a small service loop and suspects it might be the cause of the outage. Which of the following is MOST likely the issue?

 

A.

Maximum cable length exceeded

B.

Dirty connectors

C.

RF interference caused by impedance mismatch

D.

Bend radius exceeded

 

Correct Answer: D

Explanation:

The excessive bending of fiber-optic cables can increase microbending and macrobending losses. Microbending causes light attenuation induced by deformation of the fiber, while macrobending causes the leakage of light through the fiber cladding and this is morelikely to happen where the fiber is excessively bent.

 

 

QUESTION 117

A network technician has detected a personal computer that has been physically connected to the corporate network. Which of the following commands would the network technician use to locate this unauthorized computer and determine the interface it is connected to?

 

A.

nbtstat -a

B.

show mac address-table

C.

show interface status

D.

show ip access-list

E.

nslookup hostname

 

Correct Answer: B

Explanation:

The show mac address-table command is used to view the ageing timer, and also the unicast and multicast MAC addresses stored in the MAC address table by the switch. Furthermore, you can view all of the addresses in the table or only the addresses learned or specified on a particular port or VLAN.

 

 

QUESTION 118

A user calls the help desk and states that he was working on a spreadsheet and was unable to print it. However, his colleagues are able to print their documents to the same shared printer. Which of the following should be the FIRST question the helpdesk asks?

 

A.

Does the printer have toner?

B.

Are there any errors on the printer display?

C.

Is the user able to access any network resources?

D.

Is the printer powered up?

 

Correct Answer: C

Explanation:

The user has already provided you with the information relevant to the first step in the 7-step troubleshootingprocess. The next step is to “Question the obvious.” The user has stated: “…his colleagues are able to print their documents to the same shared printer.” The obvious question in this instance is whether the user can access any network resources.

 

1. Identify the problem.

Information gathering.

Identify symptoms.

Question users.

Determine if anything has changed.

 

2. Establish a theory of probable cause.

Question the obvious.

 

3. Test the theory to determine cause:

When the theory is confirmed, determine the next steps to resolve the problem.

If theory is not confirmed, re-establish a new theory or escalate.

 

4. Establish a plan of action to resolve the problem and identify potential effects.

 

5. Implement the solution or escalate as necessary.

 

6. Verify full system functionality and if applicable implement preventive measures.

 

7. Document findings, actions, and outcomes.

 

 

QUESTION 119

Wireless network users recently began experiencing speed and performance issues after access point 2 (AP2) was replaced due to faulty hardware. The original network was installed according to a consultant’s specifications and has always worked without a problem.

 

You, a network technician, have been tasked with evaluating the situation and resolving the issues to improve both performance and connectivity. Refer to the following diagram and perform any NECESSARY changes to the wireless and wired infrastructure by adjusting devices.

 

Note: Adjust the LEAST number of devices needed to fix the issue, all blue icons in the image are clickable. When you feel the simulation is complete please select the Done button.

 

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Correct Answer:

Change the speed and duplex settings on AP2 only to 100 and full.

Change the mode to G on AP2

Change the channel to 6 on AP2

 

Since we know that the network was running perfectly before replacing AP2 we should start by looking at this new device thatwas used to replace the old one. Here we see that the other AP’s have hard coded the speed and duplex settings to 100/full, while AP2 is set to auto/auto.

Also, the other AP’s have been configured to use 802.11G, while AP2 is using 802.11B.

Finally the channel that AP2 is using overlaps with AP1 which can cause problems. Channels 1, 6, and 11 are spaced far enough apart that they don’t overlap. On a non-MIMO setup (i.e. 802.11 a, b, or g) you should always try to use channel 1, 6, or 11. Since AP1 is using1, and AP3 is using 11, AP2 should be using 6.

 

References:

Dulaney, Emmett and Mike Harwood, CompTIA Network+ Authorized Exam Cram, Fourth Edition, Pearson, Indianapolis, 2012, p 269. Lammle, Todd, CompTIA Network+ Deluxe Study Guide, Deluxe Edition, Wiley Publishing, Inc., Indianapolis, 2009, pp 676, 677.

http://en.wikipedia.org/wiki/List_of_WLAN_channels#2.4.C2.A0GHz_.28802.11b.2Fg.2Fn.29

 

 

 

QUESTION 120

A network administrator recently installed a web proxy server at a customer’s site. The following week, a system administrator replaced the DNS server overnight. The next day, customers began having issues accessing public websites. Which of the following will resolve the issue?

 

A.

Update the DNS server with the proxy server information.

B.

Implement a split horizon DNS server.

C.

Reboot the web proxy and then reboot the DNS server.

D.

Put the proxy server on the other side of the demarc.

 

Correct Answer: A

Explanation:

Proxy servers act as an intermediary for requests from clients seeking resourcesfrom other servers. If the DNS server is not communicating with the proxy server, these requests are not forwarded. Therefore, updating the DNS server with the proxy server information will solve the problem.

 

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