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1. Networking Fundamentals
- OSI and TCP/IP Models: Understand the 7-layer OSI model and the 4-layer TCP/IP model.
- Networking Devices: Routers, switches, hubs, and bridges.
You Should Know:
Check network interfaces in Linux ip a ifconfig View routing table route -n ip route
2. Network Protocols
- Core Protocols: TCP (reliable) vs. UDP (fast).
- Application Layer Protocols: HTTP, HTTPS, FTP, DNS, DHCP.
You Should Know:
Test DNS resolution nslookup example.com dig example.com Check active connections netstat -tuln ss -tuln
3. Routing and Switching
- Routing Protocols: OSPF, EIGRP, BGP.
- Switching Concepts: VLANs, STP, trunking.
You Should Know:
Simulate a traceroute traceroute google.com mtr google.com VLAN configuration (Linux) vconfig add eth0 10 ip link add link eth0 name eth0.10 type vlan id 10
4. Network Security
- Firewalls, VPNs, ACLs.
- Security Protocols: SSL/TLS, IPsec.
You Should Know:
Configure iptables firewall iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -j DROP Test SSL/TLS connection openssl s_client -connect example.com:443
5. Wireless Networking
- Standards: 802.11a/b/g/n/ac/ax.
- Security: WPA2, WPA3.
You Should Know:
Scan Wi-Fi networks (Linux) iwlist wlan0 scan nmcli dev wifi list
6. Cloud Networking
- AWS VPC, Azure VNet, Google Cloud VPC.
You Should Know:
AWS CLI: List VPCs aws ec2 describe-vpcs Azure CLI: List networks az network vnet list
7. Network Automation & Scripting
- Python, Bash, PowerShell.
You Should Know:
Python: Ping sweep
import os
for ip in range(1, 255):
response = os.system(f"ping -c 1 192.168.1.{ip}")
if response == 0:
print(f"192.168.1.{ip} is up")
8. Monitoring & Troubleshooting
- Ping, Traceroute, NetFlow, SNMP.
You Should Know:
Continuous ping ping -t google.com (Windows) ping google.com (Linux) SNMP walk snmpwalk -v2c -c public 192.168.1.1
9. Virtualization & Container Networking
- Docker, Kubernetes, SDN.
You Should Know:
Docker network inspection docker network ls docker inspect <container_id> Kubernetes network check kubectl get pods --all-namespaces
10. Certifications
- CCNA, CCNP, CompTIA Network+, CCIE.
What Undercode Say
Mastering network engineering requires hands-on practice. Use Linux commands like ip, tcpdump, and `netstat` for diagnostics. Automate tasks with Python and Bash. Secure networks with firewalls (iptables, ufw) and VPNs (OpenVPN). Cloud networking (AWS/Azure CLI) is essential.
Expected Output:
A structured, practical guide to network engineering with actionable commands and scripts.
References:
Reported By: Kafait Ullah – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
