Chap 13 Network Troubleshooting Andres, Wen-Yuan Liao Department of Computer Science and Engineering...
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Transcript of Chap 13 Network Troubleshooting Andres, Wen-Yuan Liao Department of Computer Science and Engineering...
Chap 13 Network Chap 13 Network TroubleshootingTroubleshooting
Andres, Wen-Yuan Liao
Department of Computer Science and Engineering
De Lin Institute of Technology
http://www.cse.dlit.edu.tw/~andres
Troubleshooting NetworkTroubleshooting Network
Describe typical layer 1 errors Typical layer 2 errors Typical layer 3 errors Network troubleshooting
strategies
Problems in each layerProblems in each layer
Layer 1 - incorrect cable used Layer 2 - interface not
configured for Ethernet Layer 3 - subnet mask is
incorrect
Describe typical layer 1 errorsDescribe typical layer 1 errors
Broken cables Disconnected cables Cables connected to the wrong
ports Intermittent cable connectionDevices turned off
Describe typical layer 1 errorsDescribe 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
Typical layer 2 errorsTypical layer 2 errors
Improperly configured serial interf. Improperly configured Ethernet interfa
ces Improper encapsulation set (HDLC is
default for serial interfaces) Improper clockrate settings on serial i
nterfaces
Typical layer 3 errorsTypical layer 3 errors
Routing protocol not enabled Wrong routing protocol
enabled Incorrect IP addresses Incorrect Subnet Masks Incorrect DNS to IP bindings
SummarySummary Layer 1 errors Layer 2 errors Layer 3 errors Network Problems