CompTIA Network+ Certification Exam

 

QUESTION 141

A technician has prolonged contact with a thermal compound. Which of the following resources should be consulted?

 

A.

HCL

B.

MSDS

C.

SLA

D.

HVAC

 

Correct Answer: B

Explanation:

MSDS stands forMaterial Safety Data Sheet. An MSDS is a health and safety document that contains information on the potential hazards of working with a chemical product and how to work safely with the chemical product.

In this question, the thermal compound is a chemical product so the MSDS will provide information about the effects of prolonged contact with the thermal compound.

 

 

QUESTION 142

Which of the following does a network technician need to implement if a change is unsuccessful within the approved maintenance window?

 

A.

Configuration procedures

B.

Stakeholder notification

C.

Impact analysis

D.

Rollback procedure

 

Correct Answer: D

Explanation:

A rollback procedure is something that should bedocumented in a change management doc
ument. In this question, the network technician has made a change during a maintenance window. The change has not worked so the technician needs to `undo’ the change he made to revert the system back to its previous state. The network technician can then investigate why the change has not worked as expected.

The rollback procedure is the list of steps required to undo the changes made to the system.

 

 

QUESTION 143

Which of the following will negotiate standoff timers to allow multiple devices to communicate on congested network segments?

 

A.

CSMA/CD

B.

OSPF

C.

DOCSIS

D.

BGP

 

Correct Answer: A

Explanation:

Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is used by devices in an Ethernet network for transmittingdata on the network.

Any device on an Ethernet network can send data at any time. The network devices sense when the line is idle and therefore available for the transmission of data. The network device then transmits a data frame onto the network. If another device sends a frame at exactly the same time, a collision occurs and the frames are discarded. The network devices will then wait for a random period of time before attempting to send the frame again.

 

 

QUESTION 144

A network technician is utilizing a network protocol analyzer to troubleshoot issues that a user has been experiencing when uploading work to the internal FTP server. Which of the following default port numbers should the technician set the analyzer to highlight when creating a report? (Select TWO).

 

A.

20

B.

21

C.

22

D.

23

E.

67

F.

68

G.

69

 

Correct Answer: AB

Explanation:

FTP (File Transfer Protocol) is used for transferring files between an FTP client and an FTP server. FTP uses TCP Ports 20 and 21.

 

 

QUESTION 145

A network administrator is using a packet analyzer to determine an issue on the local LAN. Two separate computers are showing an error message on the screen and are unable to communicate with other computers in the same lab. The network administrator looks at the following output:

 

SRC MACSRC IPDST MACDST IP

 

00:1D:1F:AB:10:7D192.168.1.10:200015:BE:9F:AB:10:1D192.168.1.14:1200

 

05:DD:1F:AB:10:27192.168.1.10:100022:C7:2F:AB:10:A2192.168.1.15:1300

 

Given that all the computers in the lab are directly connected to the same switch, and are not using any virtualization technology, at which of the following layers of the OSI model is the problem occurring?

 

A.

Network

B.

B.Application

C.

Data link

D.

Transport

 

Correct Answer: A

Explanation:

If we look at the Source Mac column, we can see two different MAC addresses. Everynetwork interface card has a unique MAC address. These are the network cards in the two separate compute
rs.

If we look in the Source IP column, we can see that the two network cards have been assigned the same IP address (192.168.1.10). This is the problem in this question. The error message on the screens will be saying that “An IP conflict exists”. Every network card connected to the network needs to be configured with a different IP address.

As the problem is with the IP address configuration of the twocomputers, we know that the problem is occurring at the Network layer (layer 3) of the OSI model. The network layer is responsible for Internet Protocol (IP) addressing and routing.

 

 

QUESTION 146

A company is deploying a new wireless network and requires 800Mbps network throughput. Which of the following is the MINIMUM configuration that would meet this need?

 

A.

802.11ac with 2 spatial streams and an 80MHz bandwidth

B.

802.11ac with 3 spatial streams and a 20MHz bandwidth

C.

802.11ac with 3 spatial streams and a 40MHz bandwidth

D.

802.11ac with 4 spatial streams and a 160MHz bandwidth

 

Correct Answer: A

Explanation:

Spatial streaming is used in wireless communications where multiple-input-multiple-output(MIMO) is being used. With MIMO, multiple antennas are used for transmission and reception. MIMO was available in 802.11n but its capabilities have been extended in 802.11ac.

802.11ac supports a mandatory 80 MHz channel bandwidth for stations (vs. 40 MHzmaximum in 802.11n), 160 MHz available optionally and more (up to 8) special streams.

A single antenna and 80 MHz channel bandwidth provides a bandwidth of 433Mbps. In this question, we need a minimum bandwidth of 800Mbps. Two antennas and 80 MHz channel bandwidth provides a bandwidth of 867Mbps and therefore meets the requirement.

 

 

QUESTION 147

Which of the following describes an area containing a rack that is used to connect customer equipment to a service provider?

 

A.

110 block

B.

MDF

C.

DSU

D.

CSU

 

Correct Answer: B

Explanation:

MDFstands for Main Distribution Frame. A Main Distribution Frame is a commonly a long steel rack accessible from both sides. On one side of the rack is cabling that connects the service provider’s network. The other side of the rack is for the connections tothe customer’s equipment.

 

 

QUESTION 148

Before logging into the company network, users are required to sign a document that is to be stored in their personnel file. This standards and policies document is usually called which of the following?

 

A.

SOP

B.

BEP

C.

AUP

D.

SLA

 

Correct Answer: C

Explanation:

AUP stands for Acceptable Use Policy. An Acceptable Use Policy defines what a user can or cannot do with his or her computer during business hours. For example, using the company’s Internet connection to look at the sports scores on a sports website may be deemed inappropriate or unacceptable during business hours. Other examples include the use of social media websites such as Facebook or using Instant Messaging clients to chat to your friends.

 

 

 

 

 

 

QUESTION 149

A network administrator has created a virtual machine in the cloud. The technician would like to connect to the server remotely using RDP. Which of the following default ports needs to be opened?

 

A.

445

B.

3389

C.

5004

D.

5060

 

Correct Answer: B

Explanation:

RDP (Remote Desktop Protocol) is used for connecting to a remote Windows computer. When using RDP to connect to a remote Windows computer, you can view and control the desktop of the remote computer. RDP uses TCP port 3389.

 

 

QUESTION 150

When troubleshooting a network problem, browsing through the log of a switch, it is discovered that multiple frames contain errors. In which of the following layers does the problem reside? (Select TWO).

 

A.

Layer 2

B.

Layer 3

C.

Layer 5

D.

Transport layer

E.

Data link

F.

Physical layer

 

Correct Answer: AE

Explanation:

Layer 2 of the OSI reference model is the data-link layer. Components of the data-linklayer include frame-format, Media Access Control (MAC) addressing, protocol identification and error detection.

When data is being sent, it is split into protocol data units (PDUs) as it passes through the layers of the OSI model. The PDUs have different names as they are passed through the layers of the OSI model. In layer 2, the PDU is called a `Frame’.

The most common protocol specified in the data-link layer is Ethernet and the most common network component in the data-link layer is a network switch.

Inthis question, problems are discovered with Ethernet frames by examining the logs in a network switch. Therefore, for this question, we are working in Layer 2, the data-link layer.

 

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