Pertemuan 20
Network Testing
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Discussion Topics
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Introduction to network testing
Using a structured approach to troubleshooting
Testing by OSI layers
Layer 1 troubleshooting using indicators
Layer 3 troubleshooting using ping
Layer 7 troubleshooting using Telnet
2
Introduction to Network
Testing
Structured Approach to
Troubleshooting
Typical Layer 1 Errors
• Broken cables
• Disconnected cables
• Cables connected to the wrong
ports
• Intermittent cable connection
• Wrong cables used for the task
at hand
• Transceiver problems
• DCE cable problems
• DTE cable problems
• Devices turned off
Typical Layer 2 Errors
• Improperly configured serial
interfaces
• Improperly configured Ethernet
interfaces
• Improper encapsulation set
• Improper clock rate settings on
serial interfaces
• Network interface card (NIC)
problems
Typical Layer 3 Errors
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Routing protocol not enabled
Wrong routing protocol enabled
Incorrect IP addresses
Incorrect subnet masks
Layer 1 Problems in a
Network
Layer 3 Troubleshooting
Using Ping
Layer 7 Troubleshooting
Using Telnet