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Module 12: Network Troubleshooting - Coggle Diagram
Module 12: Network Troubleshooting
12.2 Troubleshooting Process
the troubleshooting process should be guided by structured methods. This requires well defined and documented troubleshooting procedures to minimize wasted time associated with erratic hit-and-miss troubleshooting.
Seven-Step Troubleshooting Process
Troubleshooting with Layered Models
Guidelines for Selecting a Troubleshooting Method
12.1 Network Documentation
All network documentation should be kept in a single location, either as hard copy or on the network on a protected server. Backup documentation should be maintained and kept in a separate location.
The purpose of network monitoring is to watch network performance in comparison to a predetermined baseline.
Step 3 - Determine the Baseline Duration
Step 2 - Identify Devices and Ports of Interest
Step 1 - Determine What Types of Data to Collect
12.4 SÃntomas y causas de los problemas de red
Physical Layer Troubleshooting
Data Link Layer Troubleshooting
Transport Layer Troubleshooting - ACLs
ransport Layer Troubleshooting - NAT for IPv4
Application Layer Troubleshooting
12.5 Troubleshooting IP Connectivity
Components of Troubleshooting End-to-End Connectivity
Step 1. Check physical connectivity at the point where network communication stops. This includes cables and hardware. The problem might be with a faulty cable or interface, or involve misconfigured or faulty hardware.
Step 2. Check for duplex mismatches.
Step 3. Check data link and network layer addressing on the local network. This includes IPv4 ARP tables, IPv6 neighbor tables, MAC address tables, and VLAN assignments.
Step 4. Verify that the default gateway is correct.
Step 5. Ensure that devices are determining the correct path from the source to the destination. Manipulate the routing information if necessary.
Step 6. Verify the transport layer is functioning properly. Telnet can also be used to test transport layer connections from the command line.
End-to-End Connectivity Problem Initiates Troubleshooting
Troubleshoot VLAN Assignment Example
