Chapter 10: Troubleshooting WAN

Question 1

List the steps of documenting network.

Answer 1

• Document the network
- Network (configuration files, physical/logical topology, baseline performance levels, type of devices/model, IOS image version, network device hostnames, location of device, module slots if present)
- End devices (device name, OS and OS version, network addressing, GW/DNS, high bandwidth applications used on the end system)
• Network topology (physical/logical, device type, manufacturer, OS, cable type and ID)
• Establish Network Baseline (used to establish normal network reference, typically performed during normal operations)
• Measure Data (ping, traceroute speeds, manual data collection [upload/download])

Question 2

List the steps of troubleshooting steps.

Answer 2

1. Gather symptoms (question end user, see if it can be reproduced)
2. Isolate the problem (use OSI layer models with different approaches top-bottom, bottom-top, divide-and-conquer)
3. Implement corrections
4. Check if problem is fixed