Revision as of 19:53, 30 November 2015

Network troubleshooting

Troubleshooting techniques

• Always start with a simple check for the user-claimed error!
• Make a plan / note for yourself:
  • Draw a simple block diagram of the situation or use an existing diagram / documentation
  • Write in short some lines of which technical facts you know about the error
  • Write in short some lines of which technical facts you should remember to check or measure ( brainstorm / idea-catalog )

Troubleshooting skills

1. Knowledge of all Technologies involved. ( How does it work? )
2. Knowledge of troubleshooting tools. ( Ping, ipconfig, show ip route .... )
3. Good at troubleshooting. ( Locating and correcting the fault in a logical way )

Troubleshooting exercises

Diagram for ITT1 network troubleshooting exercises:

Diagram for ITT1 fault finding

Troubleshooting challenge number 1: Jens has no Internet!
Troubleshooting challenge number 2: Ole has no access to Internet!
Troubleshooting challenge number 3: Viggo from IT staff has no access to SYSLOG service!
Troubleshooting challenge number 4: Louise can't reach www.itt2015.com!
Troubleshooting challenge number 5: Lars can't use FTP service!
Troubleshooting challenge number 6: Jens has no Internet access - again!
Troubleshooting challenge number 7: Ole can't reach www.itt2015.com!
Troubleshooting challenge number 8: Viggo can't reach www.google.com!
Troubleshooting challenge number 9: Louise can't use TFTP-service!
Troubleshooting challenge number 10: Lars says that nobody can use www.itt2015.com!

Extra tasks

Extra optional task: If you like the challenge of building networks in Cisco PacketTracer, try this Packet tracer activity!
Another optional task: Packet tracer activity 2