OBJ 5.2 X Flashcards

1
Q

Throughput

A

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

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2
Q

Shielded and unshielded

A

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

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3
Q

Plenum and riser-rated

A

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

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4
Q

Rollover cable/console cable

A

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

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5
Q

Crossover cable

A

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

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6
Q

Power over Ethernet

A

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

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7
Q

Attenuation

A

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

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8
Q

Interference

A

▪ 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

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9
Q

Decibel (dB) loss

A

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

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10
Q

Incorrect pinout

A

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

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11
Q

Bad ports

A

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

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12
Q

Open/short

A

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

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13
Q

Duplexing issues

A

▪ 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

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14
Q

Transmit and receive (TX/RX) reversed

A

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

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15
Q

Cable crimper

A

▪ 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

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16
Q

Punchdown tool

A

▪ 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

17
Q

Tone generator

A

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

18
Q

Loopback adapter

A

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

19
Q

Optical time-domain reflectometer (OTDR)

A

Used for fiber optic cables

20
Q

Multimeter

A

▪ 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

21
Q

Cable tester

A

▪ 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

22
Q

Wire map

A

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

23
Q

Tap

A

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

24
Q

Fusion splicers

A

A machine that is used to permanently join two fibers together

25
Q

Spectrum analyzers

A

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

26
Q

Snips/cutters

A

▪ 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

27
Q

Cable stripper

A

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

28
Q

Fiber light meter

A

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