Listen to this Post
Networking is a fundamental aspect of IT and cybersecurity. Whether you’re troubleshooting connectivity issues or securing a network, understanding key concepts like IP addressing, DNS, subnetting, and protocols (TCP/UDP) is crucial. Below is a comprehensive cheat sheet along with practical commands and steps.
You Should Know:
1. IP Addressing & Subnetting
- Check your IP (Linux/Windows):
Linux ip a ifconfig Windows ipconfig /all
- Subnet Calculation:
Calculate subnets using ipcalc (Linux) sudo apt install ipcalc ipcalc 192.168.1.0/24
2. DNS Lookup & Troubleshooting
- Query DNS Records:
Linux/Windows nslookup example.com dig example.com
- Flush DNS Cache:
Windows ipconfig /flushdns Linux (systemd-resolved) sudo systemd-resolve --flush-caches
3. TCP/UDP Port Scanning
- Scan Open Ports with Nmap:
nmap -sS -p 1-1000 target_ip
- Check Listening Ports:
Linux netstat -tulnp ss -tulnp Windows netstat -ano
4. Gateway & Routing
- Check Default Gateway:
Linux/Windows route -n ip route show
- Add a Static Route:
Linux sudo ip route add 192.168.2.0/24 via 192.168.1.1 Windows route add 192.168.2.0 mask 255.255.255.0 192.168.1.1
5. Network Traffic Analysis
- Capture Packets with Tcpdump:
sudo tcpdump -i eth0 -n 'port 80'
- Analyze Traffic with Wireshark:
wireshark -k -i eth0
What Undercode Say:
Networking is the backbone of IT infrastructure. Mastering these commands helps in diagnosing issues, securing networks, and optimizing performance. Always verify configurations and monitor traffic to prevent unauthorized access.
Expected Output:
A structured, actionable networking cheat sheet with real-world commands for IT professionals and cybersecurity enthusiasts.
For more details, check the original post: Networking Cheat Sheet – by Codelivly (if available).
References:
Reported By: Https: – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
