Networking

Understanding the TCP/IP protocol stack, layers, and how data flows across networks.

Master IP subnetting with CIDR notation, subnet calculations, and network design.

Essential tools and techniques for diagnosing and resolving network issues.

Understanding DNS hierarchy, record types, and how domain resolution works.

Configure BIND as an authoritative DNS server with zone files and security.

Secure DNS with DNSSEC, DNS over HTTPS, and protection against common attacks.

Master iptables for Linux firewall management with chains, tables, and rules.

Configure nftables, the modern replacement for iptables with improved performance.

Easy-to-use UFW (Uncomplicated Firewall) for quick Linux firewall configuration.

Configure WireGuard VPN for secure, fast point-to-point connections.

Deploy OpenVPN server with certificate-based authentication and security hardening.

Secure SSH configuration with key authentication, fail2ban, and best practices.

Create SSH tunnels for local, remote, and dynamic port forwarding.

Essential tools for monitoring network traffic, bandwidth, and connectivity.

Configure SNMP for centralized network device monitoring and management.

Core network security principles, defense in depth, and security architecture.

Deploy and configure IDS/IPS with Suricata and Snort for threat detection.

Design secure network segments with VLANs, subnets, and access controls.