[Free] 2017(Jan) Ensurepass Pass4sure CompTIA N10-006 Real Test 111-120

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CompTIA Network+ Certification Exam

 

Question 111

Ann, a user, is experiencing an issue with her wireless device. While in the conference area, the wireless signal is steady and strong. However, at her desk the signal is consistently dropping, yet the device indicates a strong signal. Which of the following is the MOST likely cause of the issue?

 

A. Signal-to-noise ratio

B. AP configuration

C. Incorrect SSID

D. Bounce

Correct Answer: D

Explanation:

The signal between the access point and Ann’s wireless device is being bounced off walls, windows, glass mirrors, carpeted floors, and many other objects. This results in the slow connection. The radio waves are travelling at the same rate, but as a result of signal bounce, it’s taking longer to reach its destination.

 

 

Question 112

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

 

Explanation:

Since we know that the network was running perfectly before replacing AP2 we should start by looking at this new device that was 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 using 1, 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 113

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. 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 a different location would solve the problem.

 

 

Question 114

A technician recently ran a 20-meter section of CAT6 to relocate a control station to a more central area on the production floor. Since the relocation, the helpdesk has received complaints about intermittent operation. During the troubleshooting process, the technician noticed that collisions are only observed on the switch port during production. Given this information, which of the following is the cause of the problem?

 

A. Distance limitation

B. Electromagnetic interference

C. Cross talk

D. Speed and duplex mismatch

Correct Answer: B

Explanation:

When cables are installed near electrical devices the signal within the cable might become corrupt. The cable connecting the control station to the switch port is now surrounded by the production machinery. Electromagnetic interference could occur when the machinery is running, causing the intermittent operation.

 

 

Question 115

A technician is troubleshooting a wired device on the network. The technician notices that the link light on the NIC does not illuminate. After testing the device on a different RJ-45 port, the device connects successfully. Which of the following is causing this issue?

 

A. EMI

B. RFI

C. Cross-talk

D. Bad wiring

Correct Answer: D

Explanation:

The question states that the device worked on a different port. This indicates that the wiring is faulty.

 

 

Question 116

A technician is tasked with connecting a router to a DWDM. The technician connects the router to the multiplexer and confirms that there is a good signal level. However, the interface on the router will not come up. Which of the following is the MOST likely cause?

 

A. The wrong wavelength was demuxed from the multiplexer.

B. The SFP in the multiplexer is malfunctioning.

C. There is a dirty connector on the fiber optic cable.

D. The fiber optic cable is bent in the management tray.

Correct Answer: A

Explanation:

A multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. A demultiplexer (or demux) is a device taking a single input signal and selecting one of many data-output-lines, which is connected to the single input. Since the signal going in is good, the problem must be with the signal output. If the correct wavelength was demultiplexed, the interface will be displayed on the router.

 

 

Question 117

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 more likely to happen where the fiber is excessively bent.

 

 

Question 118

A network technician has been assigned to install an additional router on a wireless network. The router has a different SSID and frequency. All users on the new access point and the main network can ping each other and utilize the network printer, but all users on the new router cannot get to the Internet. Which of the following is the MOST likely cause of this issue?

 

A. The gateway is misconfigured on the new router.

B. The subnet mask is incorrect on the new router.

C. The gateway is misconfigured on the edge router.

D. The SSID is incorrect on the new router.

Correct Answer: A

Explanation:

A missing or incorrect default gateway parameter limits communication to the local segment.

The question states: “All users on the new access point and the main network can ping each other and utilize the network printer, but all users on the new router cannot get to the Internet”.

 

 

Question 119

While troubleshooting a connectivity issue, a network technician determines the IP address of a number of workstations is 169.254.0.0/16 and the workstations cannot access the Internet. Which of the following should the technician check to resolve the problem?

 

A. Default gateway address

B. Misconfigured DNS

C. DHCP server

D. NIC failure

Correct Answer: C

Explanation:

If a DHCP server fails, the workstations are assigned an address from the 169.254.0.0 address range by Automatic Private IP Addressing (APIPA). APIPA also configures a suitable subnet mask, but it doesn’t configure the system with a default gateway address. This allows communication on the local network, but not externally.

 

 

Question 120

A network engineer is troubleshooting an issue with a computer that is unable to connect to the Internet. The network engineer analyzes the following output from a command line utility:

 

Network Destination Netmask Gateway Interface

 

192.168.1.0 255.255.255.0 192.168.1.254 eth0

 

192.168.1.10 255.255.255.255 192.168.1.10 eth0

 

127.0.0.1 255.0.0.0 On-Lin lo

 

127.0.0.0 255.0.0.0 On-Link lo

 

255.255.255.255 255.255.255.255 102.168.1.10 eth0

 

Which of the following is the reason for the computer issue, given the above output?

 

A. Wrong default gateway netmask

B. Incorrect default gateway address

C. Default gateway on the wrong interface

D. Missing default gateway

Correct Answer: D

Explanation:

The output appears to be a result of running the netstat -r command. If the default gateway was present, the first line would show the Network Destination as 0.0.0.0 and the Netmask as 0.0.0.0.

 

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