🔍 Network Diagnostics

📖 What is Network Diagnostics?

Network Diagnostics என்பது Network-ல் ஏற்படும் பிரச்சினைகளை கண்டறிந்து சரிசெய்ய பயன்படுத்தப்படும் Tools மற்றும் Techniques ஆகும்.

🛠 Essential Diagnostic Tools

✔ Ping

✔ Traceroute

✔ Nslookup

✔ Ipconfig

✔ Netstat

✔ Wireshark

💻 Useful Commands

ping 8.8.8.8

tracert google.com

nslookup google.com

ipconfig /all

netstat -an

🚨 Common Network Problems

No Internet Access

Slow Network

DNS Failure

DHCP Failure

Packet Loss

High Latency

🔧 Diagnostic Process

1. Identify Problem

2. Gather Information

3. Test Connectivity

4. Analyze Results

5. Fix Root Cause

6. Verify Resolution

📊 OSI Layer Troubleshooting

Layer 1 – Cable Check

Layer 2 – Switch Check

Layer 3 – IP Routing Check

Layer 4 – Port Check

Layer 7 – Application Check

🌍 Real World Usage

Enterprise Networks

Data Centers

Telecom Networks

RailTel Networks

ISP Networks

🎤 Interview Questions

What is Network Diagnostics?

Which Tool Checks Connectivity?

What is Netstat?

How Do You Troubleshoot Network Issues?

What is Packet Loss?

📝 Summary

Network Diagnostics என்பது Network Engineer-க்கு மிகவும் முக்கியமான Practical Skill ஆகும்.

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