OBJ 5.2 X

Question 1

Throughput

Answer 1

Actual measure of how much data is successfully transferred from the source to a destination

Question 2

Shielded and unshielded

Answer 2

Shielded Twisted Pair (STP)
▪ Wires are twisted in pairs and surrounded in a metallic shielding to
minimize EMI
▪ Outer shielding minimizes EMI, but makes STP cost more than UTP

Unshielded Twisted Pair (UTP)
▪ Number of twists determines how much EMI can be blocked
● CAT 6 has more twists per inch than CAT 5
▪ UTP is cheaper than STP
▪ Media of choice in most LANs

Question 3

Plenum and riser-rated

Answer 3

Plenum - Used when running cables horizontally in a building across a particular
level

Riser - Used to run network cables vertically between floors in a building in a cable riser or elevator shaft

Question 4

Rollover cable/console cable

Answer 4

A type of null-modem cable that is used to connect a computer terminal to a router’s console port

Question 5

Crossover cable

Answer 5

A type of null-modem cable that is used to connect a computer terminal to a router’s console port

Question 6

Power over Ethernet

Answer 6

o Passes electric power over twisted pair Ethernet cable to
powered devices

o PoE provides 15.4 to 60 watts of power using two twisted
pairs, and between 60-100 watts of power using all four

Question 7

Attenuation

Answer 7

Reduction of signal strength between the transmission and receipt of the signal

Question 8

Interference

Answer 8

▪ Occurs when multiple wireless networks communicate on the same
channel using the same frequency
▪ Use channels 1, 6, and 11 in the 2.4 GHz spectrum
▪ Ensure a 10-15% overlap between access points for sufficient coverage

Question 9

Decibel (dB) loss

Answer 9

Measures the amount of signal deterioration we are experiencing on a given connection

Question 10

Incorrect pinout

Answer 10

By default, the patch panel should use the TIA-568B pinout, with
pins 1 through 8 being connected as:
o White/Orange – Orange – White/Green – Blue – White/Blue – Green – White/Brown – Brown

Question 11

Bad ports

Answer 11

If you suspect a bad port on a switch or router, you should connect a loopback plug to the port on that device and run a test using specialized software

Question 12

Open/short

Answer 12

Open- There is nothing on the other end of the connection or there’s a break in the wires between the source and the destination

Short- Indicates there are two wires are connected together somewhere
in the connection

Question 13

Duplexing issues

Answer 13

▪ When one device thinks the connection is full duplex and the other thinks it is half duplex

▪ Ensure both devices are configured to auto negotiate the connection
properly

Question 14

Transmit and receive (TX/RX) reversed

Answer 14

Ethernet Pinout
Pins 1 to 3 (Tx+ to Rx+)
Pins 2 to 6 (Tx- to Rx-)

Question 15

Cable crimper

Answer 15

▪ Used to attach the connector to the end of the cable
▪ support both RJ-45 and RJ-11 connectors
▪ If you are working with coaxial cables, then you will need a cable crimper that supports an RG-6 or RG-59 connector

Question 16

Punchdown tool

Answer 16

▪ Used to terminate wires on a punch-down block without stripping off the insulation
▪ Used with 66 block or 110 block, network jacks, and patch panels

Question 17

Tone generator

Answer 17

Allows technicians to generate a tone at one end of a connection and use the probe to audibly detect the wire pair connected to the tone
generator

Question 18

Loopback adapter

Answer 18

Connects transmit pins (or fibers) to receive pins (or fiber) to test a network interface

Question 19

Optical time-domain reflectometer (OTDR)

Answer 19

Used for fiber optic cables

Question 20

Multimeter

Answer 20

▪ Checks the voltage or the amperage or the resistance of a copper cable
▪ Used to verify if a cable is broken or not
▪ Used to check coaxial cables to ensure there is no cuts or breaks in the middle of a patch cable, or test power sources or power cords

Question 21

Cable tester

Answer 21

▪ Verifies continuity for each wire in the cable to ensure there are no breaks
▪ Verifies the pinouts of the connectors
▪ Different testers for different cable types

Question 22

Wire map

Answer 22

▪ Like a cable tester, but it works specifically for twisted pair ethernet cables
▪ It can diagnose any issues with that cable

Question 23

Tap

Answer 23

A simple device that connects directly to the cabling infrastructure to split or copy packets for use in analysis, security, or general network management.

Question 24

Fusion splicers

Answer 24

A machine that is used to permanently join two fibers together

Question 25

Spectrum analyzers

Answer 25

a device that measures and displays signal amplitude (strength) as it varies by frequency within its frequency range
(spectrum

Question 26

Snips/cutters

Answer 26

▪ Used to simply cut a piece of cable off a larger spool or run of cable
▪ Looks a lot like a pair of scissors, but uses stronger blades to cut twisted copper cables, coaxial, cables, or even larger cable bundles

Question 27

Cable stripper

Answer 27

Strips the end of the cable to prepare it the attachment of a RJ-45 or other type of connector

Question 28

Fiber light meter

Answer 28

A device that provides a continuous wave of stable source of energy for attenuation measurements