Tuesday, August 19, 2008

Network troubleshooting tools

Network Troubleshooting tools
Brief description

Digital volt-meter (DVM)
- Test for existence of a break or a short in cable.
- Operates at the physical layer of OSI Reference Model.
- image (http://www.electronicsnmore.com/images/dvm9912.gif)

Time-domain reflectometer (TDR)
- Determine a break or short occourred within cable with sonar-like pulse.
- Operates at physical layer of OSI Reference Model.
- image (http://www.pantongt.com/TDR44.jpg)

Cable tester
- Examine a cable whether it meets performance standards for its type.
- Also test for impedance and other variables.
- Advance tester will have data link layer data-collection capabilities.
- image (http://www.vpi.us/vpi/images/items/tester-cable.jpg)

Protocol analyzer
- Hardware or software which can monitor network traffic, find faulty network components and also analyze the overall network performance.
- Operates at many layers of OSI model.
- image (http://www.colasoft.com/products/capsa/screenshot.gif)

Network monitor
- Software which monitor the network performance and gather statics.
- Operates from data link layer up through top of OSI model
- image (http://www.mikrotik.com/img/dude3.jpg)

Operating system tools
- Example : Windows NT Diagnostics tool.
- image (http://www.microsoft.com/library/media/1033/technet/images/archive/ntwrkstn/maintain/operate/hardwa04_big.gif)