Network Troubleshooting Chapter 21 Flashcards
What does nslookup do?
Command line tool, used to query DNS servers manually for specific records. Used when a tech needs to see if a DNS record even exists and confirm its value.
Define Time-Domain Reflectometer (TDR)
Advanced cable tester, test lengths of cables and their continuity or their discontinuity and identifies the location of any discontinuity due to a bend break unwanted crimp and so on
Define Optical Time-Domain Reflectometer (OTDR)
Tester for Fiber Optic Cable that determines continuity and reports the location of cable breaks.
Define a Certifier
Device that test the cable to ensure it can handle its rated amount of capacity.
Define Voltage Event Recorder
Tracks voltage over time by plugging into a power outlet
AKA Voltage Quality Recorder
Define Protocol Analylizer
Tool that monitors the different protocols running at different layers on the network and that can give application session network and datalink layer information on every frame going through a network.
Define Cable Stripper
Device that enables the creation of UTP cables
Define Multimeter
Tool for testing voltage (AC/DC) resistance and continuity
Define Toner
Generic term for two devices used together - a tone generator and a tone locater (probe) - to trace cables by sending an electrical signal along a wire at a particular frequency. The tone locater then emits a sound when it distinguishes that frequency. AKA Fox and Hound
Define punch down tool
Specialized tool for connecting UTP wires to a 110-block
AKA 110-Punchdown Tool
Define Wiremap
Test for cooper cables that checks not only for continuity but also that all the wires on both ends of the cable connect to the right spot. Also picks up shorts and crosswires.
Define a Fiber Light Meter
Device that measures the intensity of light pulses within or at the terminal ends of fiber optic cables.
Define Hostname (command)
Command line tool that returns the hostname of the computer its run on
Define TraceRT (also TraceRoute) (Command)
Command line utility used to follow the bath a packet takes between too hosts
Define ipconfig (command)
Command line utility for windows that displays current TCP IP configuration of the machine
MAC (ifconfig)
Linux (ip)
Define Address Resolution Protocol (ARP)
Protocol in the TCP/IP suite used with the CMD of the same name to determine the MAC Address that corresponds with a particular IP Address.
Define Ping (command)
Small ICMP message set to check for the presence and response of another system. ALSO command line utility that uses these messages to check the “Up/Down” status of an IP addressed host.
Define Arping (command)
Command used to discover hosts on a network similar to ping but that relies on ARP instead of ICMP. Wont cross any routers.
Define pathping (command)
Command line tool that combines the features of the ping command and tracert trace route commands
Define dig (Domain Information Groper) (command)
Command line tool used in non windows systems used to diagnose DNS problems
Define route (command)
Command to display and edit to a local systems routing table
Define netstat (command)
Command line utility used to examine TCP/IP connections open on a given host. Once universal though it is being replaced by (ss) in linux
Define Port Scanner
Program that probe ports on another system, logging the state of the scanned ports.
Define Nmap
Popular open source network scanner, designed to scan a network and create a map of hosts and services by sending out packets and examining the responses, frequently used as a vunurablitity scanner.
Define TCPDump
Command line packet line sniffing tool
