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Internet & Networking Guides

Discover how global data packets travel across the internet. Understand IP addressing, subnets, DNS lookups, TCP handshakes, ports, reverse proxies, CDN edge caching, and WebSockets.

What Is an IP Address? IPv4 vs IPv6, Subnets, and Routing Explained

A comprehensive guide to IP addresses: IPv4 vs IPv6, public vs private addresses, CIDR notation, subnetting, and how internet routers forward packets.

7 min read • Beginner

How DNS Works: The Internet Phonebook and Resolution Steps

Learn how the Domain Name System (DNS) resolves human domains into IP addresses: root servers, TLD servers, authoritative name servers, and record types (A, CNAME, MX).

8 min read • Beginner

What Is a Domain Name? TLDs, SLDs, Subdomains, and Registrars

Understand domain name structure: Top-Level Domains (TLDs), Second-Level Domains (SLDs), subdomains, domain registrars, and WHOIS.

6 min read • Beginner

What Is a Port in Networking? Common Ports (80, 443, 22) and Sockets

Learn what network ports are, how TCP/UDP port numbers route traffic to specific applications, port ranges (0-65535), and network sockets.

7 min read • Intermediate

What Is a Proxy Server? Forward vs Reverse Proxies Explained

Learn what proxy servers do: forward proxies for client privacy, reverse proxies (Nginx, Cloudflare) for load balancing, SSL termination, and security caching.

8 min read • Intermediate

What Is a Content Delivery Network (CDN)? Edge Caching Explained

Discover how CDNs (Content Delivery Networks) accelerate global web performance: edge servers, points of presence (PoPs), Anycast routing, and asset caching.

7 min read • Beginner