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CompTIA Network+ > Troubleshooting Physical Networks > Flashcards

Troubleshooting Physical Networks Flashcards

1
Q

Network Troubleshooting Methodology: Step 1

A
  1. Identify the problem
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2
Q

Network Troubleshooting Methodology: Step 2

A
  1. Establish a theory to determine the cause
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3
Q

Network Troubleshooting Methodology: Step 3

A
  1. Test the theory to determine the cause
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4
Q

Network Troubleshooting Methodology: Step 4

A
  1. Establish a plan of action to resolve the problem and identify potential effects
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5
Q

Network Troubleshooting Methodology: Step 5

A
  1. Implement the solution or escalate as necessary
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6
Q

Network Troubleshooting Methodology: Step 6

A
  1. Verify the whole system functionality and if applicable, implement preventive
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7
Q

Network Troubleshooting Methodology: Step 7

A 
7. Document findings, actions, outcomes, and lesson learned
▪ Gather more details
▪ Identify symptoms
▪ Check for changes
▪ Duplicate problem
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8
Q

Riser Cable

A

▪ Used to run network cables vertically between floors in a building in a
cable riser or elevator shaft
▪ Riser cables cannot be used in plenum spaces since they are not made
from PVC or FEP

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9
Q

Rollover/Console Cable

A

A cable that is used to connect a

computer to a router

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10
Q

Snips or 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

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11
Q

Cable strippers

A

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

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12
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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13
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

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14
Q

Multi-tester

A

▪ Supports not just ethernet cables using RJ-45, but also BNC connectors
for coaxial cables, as well as IDE, PATA, SATA, RJ-45, fiber, DB25, DB9s
and anything else that you might need to test

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15
Q

Wire Map tool

A

Like a cable tester, but it works specifically for twisted pair ethernet
cables
▪ It can diagnose any issues with that cable
Open, short, reversed, crossed, split pairs

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16
Q

Cable Certifier

A

Used with an existing cable to determine its Category or data throughput

17
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

18
Q

Punch-Down 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

19
Q

Toner Generator/Probe

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
▪ Often called a “Fox and Hound”
▪ Fox is a tone generator
▪ Hound is a toner probe

20
Q

Loopback Adapter

A

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

21
Q

Time-domain Reflectometer (TDR)

A

▪ Locate breaks in a copper cable and provide an estimate of the severity
and the distance to the break

22
Q

Optical Time-domain Reflectometer (OTDR)

A

Locate breaks in a fiber able and provide an estimate of the severity
and the distance to the break

23
Q

Fiber Light Meter

A

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

24
Q

Fusion Splicer

A

A machine that is used to permanently join two fibers together

25
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
▪ Spectrum analyzer is a device that measures and displays signal
amplitude (strength) as it varies by frequency within its frequency range

26
Q

Attenuation

A

▪ Loss of signal strength on a network cable or connection over the length
of the cable
▪ Twisted pair cables can transmit data over a maximum distance of 100
meters
▪ Coaxial cables can transmit data over a maximum distance of 500 meters
▪ The higher the frequency, the higher the bandwidth

27
Q

Noise

A

Additional electrical or radio frequency noise in the areas where
your network cables are operating
o Use the proper cables for the physical environment you
are operating in
o Shorten the distance
o Use an amplifier or repeater

28
Q

Fiber cleaning

A

Clean and polish both ends of fiber cable and connectors or switch to a
cable with higher quality

29
Q

Interference

A

▪ Occurs when multiple cables in the same frequency band are operating in
close proximity to each other
▪ Use high quality twisted pair cables or higher category rated cables
▪ Plan cable runs to operate in parallel to any high power cables

30
Q

Decibel (dB) Loss

A 
▪ Measures the amount of signal deterioration we are experiencing on a
given connection
● Copper
o decrease in voltage
● Fiber
o amount of lost light
31
Q

Copper Cable Issues

A

Incorrect pinouts
Bad port
Open
Short

32
Q

Bad port

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

33
Q

Open

A

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

34
Q

Short

A

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

35
Q

Fiber Cable Issues

A

Transceiver
Dry Cleaning
Wet Cleaning

36
Q

Transceiver

A

▪ A transmitter and a receiver combined into a single device that converts a
network connection from one type to another
▪ They are designed to support a certain type of connection and a certain
cable type

37
Q

Dry Cleaning

A

▪ Using light pressure while rubbing the end face of a fiber cable or
connector with a dry-cleaning cloth in one direction

38
Q

Wet Cleaning

A

▪ Moistening a piece of lint-free cloth with a fiber optic cleaning solution
and wiping the end face of the cable or connector

39
Q

Ethernet Issues

A

Duplex Mismatch
▪ 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

CompTIA Network+ (22 decks)

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