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Troubleshooting Tools

Troubleshooting Tools

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Troubleshooting Tools

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  1. Troubleshooting Tools Kyle Broussard and Alexandra Mikolai

  2. Hardware Tools

  3. Broken Cables • Broken cables cause permanent disconnections, not slowdowns • Types of broken cables • Open circuit • Short • Wire map problem • Crosstalk • Noise • Impedance mismatch

  4. Cable Testers, TDRs, and OTDRs • Cable testers tell you if there’s a continuity problem or if a wire map is incorrect • TDR and OTDR tell where the break in the cable is • TDR = time domain Reflectometers • OTDR = optical time domain reflectometers

  5. Cable Certifiers • Certifiers test cable to ensure it can handle its rated capacity • Should use when there is a slowdown or to eliminate cabling as the problem

  6. Voltage Event Recorder/ Temperature Monitor • Heat and power problems can manifest as intermittent problems • Use to monitor server rooms over time to detect and record issues with electricity and heat

  7. Protocol Analyzers • Monitor the different protocols running at different layers on the network • Helps to determine slowdowns on a network by giving an idea of excess or unexpected traffic

  8. Cable Strippers, Snips, and Crimpers • Used to make UTP cables

  9. Multimeters • Test voltage, resistance and continuity • Only tool to read amount of voltage on a line • Used also for continuity testing if cable tester is unavailable

  10. Tone Probes/Generators • Used together to help locate a particular cable

  11. Butt Sets • Used to test whether a particular phone line is working or not

  12. Punchdown Tools • Put UTP wires into 66- and 110-blocks. • Only used diagnostically to repunch a connection

  13. Software Tools

  14. Built-In Software

  15. The traceroute Command

  16. Trace all routers between two points • Diagnose where the problem lies when unable to reach remote system • Many routers block ICMP packets

  17. The mtr Command

  18. The ipconfig and ifconfig Commands

  19. The ping and arping Commands

  20. Ping • Uses ICMP packets to query by IP or name • Works across routers • Arping • Use if ping doesn’t work • Uses ARP frames instead of ICMP packets • ARP frames do not cross routers, can only be used within broadcast domains • UNIX based systems

  21. The nslookup/dig Commands

  22. The hostname Command

  23. The route Command

  24. The nbtstat Command

  25. Windows only program • Should always be ran with a switch • Most useful switch is –n which shows the local NetBIOS names • Useful way to see what systems are on your network

  26. The netstat Command

  27. Third-Party Software

  28. Packet Sniffer

  29. Also called protocol analyzers • Intercepts and logs packets • Wireshark

  30. Port Scanners

  31. Probes ports on other systems • Used to look for unintentionally opened ports • Used by hackers • Nmap

  32. Throughput Testers

  33. Measures data flow in a network • Speedtest.net