indentify and resolve network problems.pptx

indentify and resolve network p

1. Identify and Resolve Network Problems INFOLINK UNIVERSITY COLLEGE CHAPTER 1 Network Troubleshooting Fundamentals

2. Introduction to Network Troubleshooting Importance of troubleshooting in networking Common network issues (slow speeds, connection failures, hardware faults ) Systematic approach to problem-solving Best Practices in Network Troubleshooting

3. Common Network Problems Hardware Issues : Damaged cables, Network Interface Card (NIC) failures, switch/router malfunctions. Software Issues: Incorrect configurations, outdated drivers, presence of malware. Connectivity Issues: IP address conflicts, DNS resolution failures, firewall restrictions. Performance Issues: Network latency, congestion, packet loss.

4. Network Troubleshooting Methodologies OSI and TCP/IP Model Approach : Diagnose network issues layer-by-layer, starting from the physical layer (OSI) or the network layer (TCP/IP), to identify where the problem lies. Top-Down Approach: Start troubleshooting from the application layer and work down to lower layers. This method is useful when the issue is application-related. Bottom-Up Approach: Begin from the physical layer and move up through the layers. This approach is helpful when the issue might be related to hardware or network connections. Divide and Conquer Approach: Isolate and test different network segments or components to quickly narrow down the cause of the problem.

5. The OSI Model in Troubleshooting Layer 1 (Physical) – Inspect cables, power supply, and connections. Layer 2 (Data Link) – Check MAC addresses and switch configurations. Layer 3 (Network) – Use Ping to test connectivity, verify IP addressing and routing tables. Layers 4-7 – Review firewall rules and application configurations.

6. TCP/IP Model and Troubleshooting Network Interface Layer – Cable faults, NIC (Network Interface Card) failure Internet Layer – Incorrect IP configuration, routing table errors Transport Layer – Port blocking by firewall, TCP handshake failure Application Layer – DNS resolution failure, HTTP/FTP service downtime

7. Network Documentation and Reporting Importance of proper documentation in troubleshooting Simplifies Troubleshooting Reduces Downtime Enhances Network Security Supports Disaster Recovery Documents? Network Diagrams and Topology Maps – Visual representation of network structure. Log Files and Event Monitoring – Records of network activity and system events. Troubleshooting Logs and Incident Reports – Documented network issues and resolutions.

8. Best Practices in Network Troubleshooting Follow a structured troubleshooting approach
Use proper diagnostic tools (ping, traceroute, Wireshark)
Keep network documentation updated
Communicate effectively with users and team members

9. Summary & Key Takeaways Understanding common network issues is crucial
Use a structured troubleshooting method (OSI/TCP-IP)
Documentation helps in problem resolutio n Practical experience is key to mastering troubleshooting