Section 20: Network Troubleshooting Methodology Flashcards
What are the 7 Steps to Troubleshooting?
1) Identify the problem
2) Establish a theory to determine the cause
3) Test the theory to determine the cause
4) Establish a plan of action to resolve the problem and identify potential effects
5) Implement the solution or escalate as necessary
6) Verify the whole system functionality and if applicable, implement preventive measures
7) Document findings, actions, outcomes, and lesson learned
What is Throughput?
Actual speed of data on the network
What is a Shielded Twisted Pair (STP)?
Wires are twisted in pairs and surrounded in a metallic shielding to minimize EMI
What is an Unshielded Twisted Pair (UTP)?
Number of twists determines how much EMI can be blocked
What is a Plenum Cable?
Used when running cables horizontally in a building across a particular level
What is a Riser Cable?
Used to run network cables vertically between floors in a building in a cable rise or elevator shaft
What is a Rollover/Console Cable?
A type of null-modem cable that is used to connect a computer terminal to a router’s console port
What is a Crossover Cable?
Connects two Ethernet devices directly, such as two computers without a switch or a router in between
What is Power over Ethernet (PoE)?
Passes electric power over twisted pair Ethernet cable to powered devices
What is Attenuation?
Reduction of signal strength between the transmission and receipt of the signal
What is Interference?
Occurs when multiple wireless networks communicate on the same channel using the same frequency
What is Decibel (dB) Loss?
Measures the amount of signal deterioration we are experiencing on a given connection
What is the default pinout for the TIA-568B?
White/Orange - Orange - White/Green - Blue - White/Blue - Green - White/Brown - Brown
What do you do if there’s a Bad Port?
Connect a loopback plug to the port on that device and run a test using specialized software
What is an 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
What is a Short?
Indicates there are two wires are connected together somewhere in the connection
What is the Activity Light?
Used to show the status of the link when it’s in used
What does it mean if the Activity Light is off?
Means there’s no link or no connection being established
What does it mean if the Activity Light is solid orange?
Means there’s a link or a connection established with the NIC
What does it mean if the Activity Light is blinking orange?
Means there’s data activity occurring over that link or connection
When the Link Speed Light is green, what is the speed?
1 Gb/s
When the Link Speed Light is orange, what is the speed?
100 Mb/s
When the Link Speed Light is off, what is the speed?
10 Mb/s
What is a Transceiver?
A transmitter and a receiver combined into a single device that converts a network connection from one type to another
What is a Duplex Mismatch?
When one device thinks the connection is full duplex and the other thinks it is half duplex
What is Dry Cleaning regarding Fiber Optics?
Using light pressure while rubbing the end face of a fiber optic or connector with a dry-cleaning cloth in one direction
What is Wet Cleaning regarding Fiber Optics?
Moistening a piece of lint-free cloth with a fiber optic cleaning solution and wiping the end face of the cable or connector
What is a Cable Crimper? What 2 connectors does it support?
Used to attach the connector to the end of the cable. Supports both RJ-45 and RJ-11 connectors
What is a Punchdown Tool? What is it used for?
Used to terminate wires on a punch-down block without stripping off the insulation. 66 Block, 110 Block, network jacks, and patch panels
What is a Tone Generator?
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
What is a Loopback Adapter?
Connects transmit pins (or fibers) to receive pins (or fiber) to test a network interface
What is the Optical Time Domain Reflectometer (OTDR)?
Locate breaks in fiber optic cables and provide an estimate of the severity and the distance to the break
What is a Multimeter?
Checks the voltage or the amperage or the resistance of a copper cable
What is a Cable Tester?
verifies continuity for each wire in the cable to ensure there are no breaks
What is a Wire Map Tool?
Like a cable tester, but it works specifically for twisted pair Ethernet cables
What is a Tap?
A simple device that connects directly to the cabling infrastructure to split or copy packets for use in analysis, security, or general network management
What is a Fusion Splicer?
A machine that is used to permanently join two fibers together
What is a Spectrum Analyzer?
A device that measures and displays signal amplitude (strength) as it varies by frequency within its frequency range (spectrum)
What are Snips/Cutters?
Used to simply cut a piece of cable off a larger spool or run of cable
What is a Cable Stripper?
Strips the end of the cable to prepare it the attachment of a RJ-45 or other type of connector
What is a Fiber Light Meter?
A device that provides a continuous wave of stable source of energy for attenuation measurements
