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Networking Guide

Networking Guide - Complete Reference

Section titled “Networking Guide - Complete Reference”

A comprehensive networking guide for DevOps, SRE, and SysAdmin roles. This guide covers everything from fundamentals to advanced topics, following the aws-devops-guide structure.

Table of Contents

Section titled “Table of Contents”

Part 1: Fundamentals

Section titled “Part 1: Fundamentals”

Part 2: Subnetting

Section titled “Part 2: Subnetting”

Part 3: Network Services

Section titled “Part 3: Network Services”

Part 4: Routing

Section titled “Part 4: Routing”

Part 5: Security

Section titled “Part 5: Security”

Part 6: Wireless

Section titled “Part 6: Wireless”

Part 7: Monitoring

Section titled “Part 7: Monitoring”

Part 8: Advanced Topics

Section titled “Part 8: Advanced Topics”

Part 9: Architecture

Section titled “Part 9: Architecture”

Part 10: Cloud Networking

Section titled “Part 10: Cloud Networking”

Chapter Overview

Section titled “Chapter Overview”

Fundamentals (Chapters 1-3)

Section titled “Fundamentals (Chapters 1-3)”
  • OSI Model: 7 layers, PDUs, devices at each layer
  • TCP/IP: 4-layer model, protocols, handshake, states
  • IP Addressing: IPv4, IPv6, private addresses

Subnetting (Chapter 4)

Section titled “Subnetting (Chapter 4)”
  • CIDR notation
  • Subnet masks
  • VLSM
  • Practical examples

Services (Chapters 5-7)

Section titled “Services (Chapters 5-7)”
  • DNS: Hierarchy, record types, queries, tools
  • DHCP: DORA process, lease lifecycle, configuration
  • NAT/PAT: Types, port forwarding, configuration

Routing (Chapters 8-9)

Section titled “Routing (Chapters 8-9)”
  • Routing table, decision process
  • Static vs Dynamic routing
  • RIP, OSPF, EIGRP, BGP

Security (Chapters 10-11)

Section titled “Security (Chapters 10-11)”
  • Firewalls: Packet filtering, stateful, iptables, nftables
  • VPN: Protocols (IPsec, OpenVPN, WireGuard)

Wireless (Chapter 12)

Section titled “Wireless (Chapter 12)”
  • WiFi standards (802.11a/b/g/n/ac/ax)
  • Channels, security (WPA2, WPA3)

Monitoring (Chapter 13)

Section titled “Monitoring (Chapter 13)”
  • Tools: ping, traceroute, mtr
  • Packet capture: tcpdump, tshark
  • Monitoring systems: Prometheus, Grafana

Advanced Topics (Chapters 14-15)

Section titled “Advanced Topics (Chapters 14-15)”
  • Load Balancing: Algorithms, HAProxy, Nginx
  • VLANs: 802.1Q, trunking, VXLAN

Architecture (Chapter 16)

Section titled “Architecture (Chapter 16)”
  • Network types, topologies
  • Three-tier model, DMZ
  • Segmentation strategies

Cloud Networking (Chapter 17)

Section titled “Cloud Networking (Chapter 17)”
  • VPC concepts
  • Subnets, security groups
  • Cloud connectivity options
  • Load balancing in cloud

Key Features

Section titled “Key Features”
  • Detailed Explanations: Every topic covered in depth
  • ASCII Flowcharts: Visual representations without external tools
  • Arch Linux Focus: Commands and tools compatible with Arch Linux
  • Practical Examples: Real-world configurations
  • Cheat Sheets: Quick reference for commands

Quick Command Reference

Section titled “Quick Command Reference”

Network Configuration

Section titled “Network Configuration”
Terminal window
# Show IP address
ip addr show


# Show routing table
ip route show


# Check connectivity
ping -c 4 8.8.8.8


# Trace route
traceroute 8.8.8.8

Firewall (iptables)

Section titled “Firewall (iptables)”
Terminal window
# List rules
sudo iptables -L -n -v


# Allow SSH
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT


# Allow established connections
sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

DNS Tools

Section titled “DNS Tools”
Terminal window
# DNS lookup
dig example.com


# Reverse lookup
dig -x 8.8.8.8


# Query specific server
dig @8.8.8.8 example.com

Wireless

Section titled “Wireless”
Terminal window
# Scan WiFi
nmcli device wifi list


# Connect to WiFi
nmcli device wifi connect "SSID" password "PASSWORD"

Networking Checklist

Section titled “Networking Checklist”
  • OSI Model (7 layers)
  • TCP/IP Model and Protocols
  • IP Addressing (IPv4, IPv6)
  • Subnetting (CIDR, VLSM)
  • DNS (Record types, resolution)
  • DHCP (DORA process)
  • NAT/PAT
  • Routing (Static, Dynamic)
  • Routing Protocols (RIP, OSPF, BGP)
  • Firewalls (iptables, nftables)
  • VPN (IPsec, OpenVPN, WireGuard)
  • Wireless (WiFi standards, security)
  • Network Monitoring
  • Load Balancing
  • VLANs
  • Network Architecture
  • Cloud Networking

Additional Resources

Section titled “Additional Resources”

Last Updated: February 2026