Ensurepass

 

QUESTION 51

Which of the following wireless standards provide speeds up to 150Mbps?

 

A.

802.11a

B.

802.11b

C.

802.11g

D.

802.11n

 

Correct Answer: D

Explanation:

802.11n builds upon previous 802.11 standards by adding multiple-input multiple-output (MIMO). The additional transmitter and receiver antennas allow for increased data throughput through spatial multiplexing and increased range by exploiting the spatial diversity through coding schemes like Alamouti coding. The speed is 150 Mbit/s (even 250 Mbit/s in PHY level)

 

 

QUESTION 52

Users are reporting wired connectivity drops in a new office with brand new CAT6 infrastructure. Which of the following tools should a technician use to BEST troubleshoot this issue?

 

A.

OTDR

B.

Protocol analyzer

C.

Toner probe

D.

Cable certifier

 

Correct Answer: D

Explanation:

A cable certifier is an electronic device used to verify the source of electric current, voltage and a switching matrix used to connect the current source and the volt meter to all of th
e contact points in a cable.

 

 

QUESTION 53

A CAT5e network cable run needs to be installed over fluorescent lighting arrays in an office building. Which of the following cable types would be BEST suited for such an installation?

 

A.

UTP

B.

Plenum

C.

Coaxial

D.

STP

 

Correct Answer: D

Explanation:

Shielded twisted pair is a special kind of cop
per telephone wiring used in some business installations. An outer covering or shield is added to the ordinary twisted pair telephone wires; the shield functions as a ground.

 

Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company. To reduce crosstalk or electromagnetic induction between pairs of wires, two insulated copper wires are twisted around each other. Each signal on twisted pair requires both wires

 

 

QUESTION 54

A technician needs to ensure that traffic from a specific department is separated within several switches. Which of the following needs to be configured on the switch to separate the traffic?

 

A.

Duplex settings

B.

SNMP string

C.

VLAN assignments

D.

Spanning tree

 

Correct Answer: C

Explanation:

A VLAN is a group of end stations with a common set of requirements, independent of physical location. VLANs have the same attributes as a physical LAN but allow you to group end stations even if they are not located physically on the same LAN segment.

 

 

QUESTION 55

A technician replaces a failed router in an office with the same model unit using the default settings. After the installation, the technician reboots all of the PCs and servers. Upon reboot some of the PCs are receiving IP addresses on the same subnet as the new router; other PCs are receiving addresses on the same subnet as the servers. Which of the following most likely describes the issue?

 

A.

The DHCP lease pool was not large enough

B.

DHCP lease times were set too low

C.

The router is not the only DHCP server

D.

DHCP was not enabled on the replacement router

 

Correct Answer: C

Explanation:

This happens when there are multiple DHCP servers in the same LAN subnet. Here some machines are getting ip address from the router while some are getting ip address from another DHCP server present in the same domain.

 

 

QUESTION 56

You have been tasked with testing a CAT5 cable. A summary of the test results can be found on the screen.

 

Step 1: Select the tool that was used to create the cable test results.

 

Step 2: Interpret the best results and select the options that explains the results.

 

clip_image001

clip_image003

 

Correct Answer:

Cable certifier – incorrectly crimped cable

 

 

QUESTION 57

Which of the following reduces the deployment cost of a wireless LAN?

 

A.

WPA

B.

802.1x

C.

MIMO

D.

PoE

 

Correct Answer: D

Explanation:

Power over Ethernet or PoE describes any of several standardized or ad-hoc systems which pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras.

 

 

QUESTION 58

Which of the following technologies is used to connect public networks using POTS lines?

 

A.

OC3

B.

OC12

C.

PSTN

D.

Cable

 

Correct Answer: C

Explanation:

The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers, thus allowing any telephone in the world to communicate with any other

 

 

QUESTION 59

802.11n can operate at which of the following frequencies? (Select TWO).

 

A.

2.4Mhz

B.

2.5Mhz

C.

5Mhz

D.

2.4Ghz

E.

2.5Ghz

F.

5Ghz

 

Correct Answer: DF

Explanation:

802.11n is an amendment which improves upon the previous 802.11 standards by adding multiple-input multiple-output antennas (MIMO). 802.11n operates on both the 2.4 GHz and the lesser used 5 GHz bands.

 

 

QUESTION 60

A technician has a network with a mix of newer and older equipment. Which of the following settings would dynamically configure whether to use full or half duplex?

 

A.

Transmission speed

B.

Frequency

C.

Auto-negotiate

D.

Distance

 

Correct Answer: C

Explanation:

Autonegotiation is an Ethernet procedure by which two connected devices choose common transmission parameters, such as speed, duplex mode, and flow control. In this process, the connected devices first share their capabilities regarding these parameters and then choose the highest performance transmission mode they both support.

 

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