Master OSI & TCP/IP models, IP Subnetting, Routing Protocols, TCP Handshake, UDP, DNS, HTTP/1.1 vs HTTP/2 vs HTTP/3, and WebSockets.
Computer Networks study protocols and architectures enabling devices to exchange digital packets over physical copper, fiber optics, and wireless radio media.
Understanding packet flows, TCP windowing, DNS resolution, and latency optimization is critical for backend engineers, DevOps specialists, and security practitioners.
Cloud infrastructure (AWS VPC, Cloudflare CDN), Web Developers, Microservice API Gateway Architects.
Core component in system design and networking interviews (TCP 3-way handshake vs 4-way teardown, HTTP vs HTTPS, DNS propagation, IP Subnetting, Load Balancing).
Mandatory subject in CS curricula and a high-scoring section in GATE CS and Cisco certifications (CCNA).
Learn the 7 layers of OSI model, 4 layers of TCP/IP, Encapsulation/Decapsulation, and Data Units (PDUs).
Master 3-Way Handshake (SYN, SYN-ACK, ACK), 4-Way Teardown, Flow Control, Sliding Window, and Connectionless UDP.
Master Recursive vs Iterative DNS queries, Root Servers, TLD Servers, Authoritative Nameservers, and DNS Record Types.
Master HTTP methods, status codes, SSL/TLS handshake, Multiplexing, Head-of-Line Blocking, and QUIC protocol.
Master WebSocket Handshake (101 Switching Protocols), Full-Duplex communication, Long Polling, and Server-Sent Events (SSE).
Master Layer 4 vs Layer 7 Load Balancers, Reverse Proxies, NAT, Firewalls, and DDoS Protection.