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Chapter 13 Network Troubleshooting

Chapter 13 Network Troubleshooting. Troubleshooting problems in a 5 router network. Sample LAB SETUP. 204.204.7.1. S0. S1. Console. S0. LAB C. Cable. 199.6.13.1. 199.6.13.2. Console. LAB B. S1. Cable. 199.6.13.0 NW. 204.204.7.2. 255.255.255.0. LAB D. 201.100.11.2. S1.

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Chapter 13 Network Troubleshooting

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  1. Chapter 13 Network Troubleshooting • Troubleshooting problems in a 5 router network

  2. Sample LAB SETUP 204.204.7.1 S0 S1 Console S0 LAB C Cable 199.6.13.1 199.6.13.2 Console LAB B S1 Cable 199.6.13.0 NW 204.204.7.2 255.255.255.0 LAB D 201.100.11.2 S1 204.204.7.0 NW 210.93.105.1 255.255.255.0 E0 Console 201.100.11.0 NW Cable 255.255.255.0 S0 201.100.11.1 Switch LAB A 210.93.105.0 NW 255.255.255.0 E0 210.93.105.2 Console Cable LAB E Console Cable

  3. Layer 1 Errors • Broken cables • Disconnected cables • Cables connected to the wrong ports • Intermittent cable connection • Wrong Cables used for the task at hand. Must use rollovers, straight-through and cross-over cables properly • Transceiver problems • DCE cable problems • DTE cable problems • Devices turned off or unplugged

  4. Layer 2 Errors • Improperly configured serial interfaces • Improperly configured Ethernet interfaces • Cables connected to the wrong ports • Improper encapsulation set (HDLC is the default for serial interfaces) • Improper clock rate settings on serial interfaces

  5. Layer 3 Errors • Routing protocol not enabled • Wrong routing protocol enabled • Incorrect IP addresses • Incorrect subnet masks • Incorrect DNS to IP bindings

  6. OSI Layer Troubleshooting START NO Layer 1 OK? Fix Layer 1 YES NO Layer 2 OK? Fix Layer 2 YES NO Layer 3 OK? Fix Layer 3 YES NO Layer 4 OK? Fix Layer 4 YES NO Layer 5 OK? Fix Layer 5 YES NO Layer 6 OK? Fix Layer 6 YES NO Layer 7 OK? Fix Layer 7 YES STOP

  7. START Collect all available information and analyze the symptoms of failure Localize the problem to within a single network segment, to a single complete module or unit, or to a single user Isolate the trouble to a specific hardware or software, within a unit, module, or user’s network account Locate and correct the specific problem Verify that the problem has been solved YES Other problems? 5 - Step Troubleshooting NO STOP

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