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Chap 13 Network Troubleshooting

Chap 13 Network Troubleshooting

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Chap 13 Network Troubleshooting

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  1. Chap 13 Network Troubleshooting Andres, Wen-Yuan Liao Department of Computer Science and Engineering De Lin Institute of Technology andres@dlit.edu.tw http://www.cse.dlit.edu.tw/~andres

  2. Troubleshooting Network • Describe typical layer 1 errors • Typical layer 2 errors • Typical layer 3 errors • Network troubleshooting strategies

  3. Problems in each layer • Layer 1 - incorrect cable used • Layer 2 - interface not configured for Ethernet • Layer 3 - subnet mask is incorrect

  4. Describe typical layer 1 errors • Broken cables • Disconnected cables • Cables connected to the wrong ports • Intermittent cable connection • Devices turned off

  5. Describe typical layer 1 errors • Wrong cables used for the task at hand (must use rollovers, cross-connects, and straight-through cables correctly) • Transceiver problems • DCE cable problems • DTE cable problems

  6. Typical layer 2 errors • Improperly configured serial interf. • Improperly configured Ethernet interfaces • Improper encapsulation set (HDLC is default for serial interfaces) • Improper clockrate settings on serial interfaces

  7. Typical layer 3 errors • Routing protocol not enabled • Wrong routing protocol enabled • Incorrect IP addresses • Incorrect Subnet Masks • Incorrect DNS to IP bindings

  8. Summary • Layer 1 errors • Layer 2 errors • Layer 3 errors • Network Problems