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Module 12: Network Troubleshooting, Link Title - Coggle Diagram
Module 12: Network Troubleshooting
Network Documentation
Network topology diagrams (physical and logical)
Hardware and software inventory
Device configurations
IP addressing and subnetting
Network policies and procedures
Troubleshooting Process
Formulate a hypothesis (Determine probable causes)
Test the hypothesis (Apply temporary fixes)
Identify the problem (Gather symptoms, talk to users)
Implement a solution (Adjust configurations or replace hardware)
Document the incident (Update records for future reference)
Troubleshooting Tools
Ping (Tests connectivity)
Wireshark (Traffic analysis)
Netstat (Displays active connections)
Nmap (Device and port scanning)
Traceroute (Tracks network paths)
Multimeters
Cable testers
Network sniffers
Protocol analyzers
Symptoms and Causes of Network Problems
Slow network speed
Packet loss
Intermittent connection
Connection errors (DNS, DHCP)
Hardware failures (cables, switches, routers)
Incorrect IP or DNS configuration
Inability to access certain services
Network congestion
Cyber attacks or malwarem
ISP issues
Troubleshooting IP Connectivity
Test local connectivity (ping the gateway)
Test external connectivity (ping public sites)
Check IP configuration (ipconfig/ifconfig)
Verify DNS and DHCP services
Use traceroute to detect routing issues
Check firewall and security rules
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