Network+ Chapter 20 Definitions

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Network+ Chapter 20 Definitions
2013-06-25 14:48:41
Network Troubleshooting

Network Troubleshooting
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  1. Cable Certifier
    A very powerful cable testing device used by professional installers to test the electrical characteristics of a cable and then generate a certification report, proving that cable runs pass TIA/EIA standards.
  2. Voltage Event Recorder
    Tracks voltage over time by plugging into a power outlet.
  3. Temperature Monitor
    Device for keeping a telecommunications room at an optimal temperature.
  4. Protocol Analyzer
    A tool that monitors the different protocols running at different layers on the network and that can give Application, Session, Network, and Data Link layer information on every frame going through a network.
  5. Multimeters
    A tool for testing voltage (AC and DC), resistance, and continuity.
  6. Toners
    Generic term for two devices used together-a tone generator and a tone locator(probe)-to trace cables by sending an electrical signal along a wire at a particular frequency.  The tone locator then emits a sound when it distinguishes that frequency.  Fox & Hound.
  7. Butt Set
    Device that can tap into a 66-or 110-punchdown block to see if a particular line is working.
  8. ipconfig
    a command-line utility for Windows that displays the current TCP/IP configuration of the machine; similar to UNIX/Linux's ifconfig.
  9. Ping (Packet Internet Groper)
    A small network message sent by a computer to check for the presence and response of another system.  A ping uses ICMP packets.
  10. Internet Control Message Protocol (ICMP)
    Protocol in which messages consist of a single packet and are connectionless.  ICMP packets determine connectivity between two hosts.
  11. Arping
    A command used to discover hosts on a network, similar to ping, but that relies on ARP rather than ICMP.  The arping command won't cross any routers, so it will only work within a broadcast domain.
  12. Domain Information Groper (DIG)
    Command-line tool in non-Windows systems used to diagnose DNS problems.
  13. nslookup
    A once handy tool that advanced techs used to query the functions of DNS servers.  Most DNS servers now ignore all but the most basic nslookup queries.
  14. route
    A command that enables a user to display and edit the local system's routing table.
  15. netstat
    a universal command-line utility used to examine the TCP/IP connections open on a given host.
  16. nbstat
    A command line utility used to check the current NetBIOS name cache on a particular machine.  The utility compares BIOS names to their corresponding IP addresses.
  17. Port scanner
    Is a program that probes on another system, logging the state of the scanned ports.  These tools are used to look for unintentionally opened ports that might make a system vulnerable to attack.
  18. Proxy ARP
    The process of making remotely connected computers act as though they are on the same LAN as local computers.

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