TCP/IP Model and Layer 3 Networking (Routing)
A practical explanation of the TCP/IP model with emphasis on Layer 3 (routing), IP addressing, and routing protocols such as OSPF and BGP.
Articles
Insights and guides on email, security, and modern tools.
Articles list
Firewalls and Network Segmentation
Learn how to design firewall policies and network segmentation to isolate systems, reduce attack surface, and improve compliance.
DNS Deep Dive: How Domain Resolution Really Works
A developer-friendly deep dive into DNS: TLDs, authoritative servers, recursive resolvers, caching, and common record types (A, AAAA, CNAME, MX, TXT).
How the Internet Works — From Packets and Protocols to Global Infrastructure
Learn how the internet works behind the scenes, from data packets and protocols to routing, DNS, and worldwide infrastructure.
Reverse Proxy Patterns: Architectures for Scalable Web Applications
Understand reverse proxy patterns such as load balancing, SSL termination, caching, API gateways, and edge proxies, and learn when to use each in modern web architectures.
Zero-Trust Networks: Principles and Best Practices
Learn the principles of zero-trust networks. Understand how micro-segmentation, continuous verification, and least-privilege access protect modern networks.
QoS (Quality of Service): Prioritizing Network Traffic the Smart Way
Learn how QoS manages network congestion, prioritizes critical applications, and improves performance.
IPv6 Explained: Why the Internet Is Moving Beyond IPv4
Learn why IPv6 is replacing IPv4: address exhaustion, performance benefits, security, and real-world adoption.
Network Address Translation (NAT): How It Really Works
Understand NAT, why it exists, how it maps private to public IPs, and its impact on performance and security.
Anycast vs Unicast vs Multicast: Traffic Routing Explained
Learn the differences between unicast, multicast, and anycast routing, and when to use each.
Understanding Zero-Trust Security: The New Standard for Modern Systems
Overview of zero-trust security principles — never trust, always verify — and practical best practices for implementing zero-trust in modern systems.