Computer Network
Computer Networks connect computers and devices, enabling them to communicate and share data efficiently. They form the foundation of the internet, cloud computing, and modern digital communication.
Computer Networks are systems that connect multiple computers and devices to exchange information and share resources such as files, printers, and internet access. They use communication protocols to ensure reliable and secure data transmission. Networks can be classified into LAN, MAN, WAN, and other types based on their size and coverage. They play a vital role in businesses, education, healthcare, and everyday communication. Understanding computer networking is essential for careers in IT, cybersecurity, cloud computing, and system administration.
What You'll Learn
Introduction to Computer Networks
Computer Networks Explained
A visual, no-fluff tutorial on the two questions every network answers: how far does it reach, and …
57 minOSI Model vs TCP/IP: All 7 Layers Explained
A visual, layer-by-layer breakdown of the OSI reference model (7 layers) and the TCP/IP model (4 la…
65 minCircuit Switching vs Packet Switching
A 16-section, expert-level walkthrough of the two foundational ways networks move data and the four…
37 minPhysical Layer
Data Link Layer
Data Link Layer — Framing, Error Control & Flow Control Explained with Real Cases
A hands-on tutorial on the Data Link Layer covering framing (byte & bit stuffing), error detection …
63 minMedium Access Control Explained: ALOHA, CSMA/CD & CSMA/CA
From Norman Abramson's 1971 Hawaii radio experiment to modern WiFi and 800 GbE — this comprehensive…
59 minNetwork Layer
The IPv4 Header Explained Field by Field: Version, IHL, DSCP, TTL
A complete walkthrough of every field in the IPv4 header defined by Jon Postel in RFC 791 (Sept 198…
51 minIPv4 Addressing, Subnetting & CIDR Explained: Classful Design, Subnet Masks, VLSM
From Vint Cerf's "32 bits was enough" confession in 1977 to RIPE running dry in 2019 — a complete t…
68 minIPv6 Explained
A complete guide to IPv6 for network engineers: 128-bit addresses, hextet notation, RFC 5952 compre…
73 minRouting Algorithms Explained: RIP, OSPF, and BGP — Distance Vector, Link State & Path Vector
Master the three routing algorithms that power the modern Internet. This tutorial covers Distance V…
49 minRouters, ARP & ICMP Explained: How Packets Find Their Way — Animated Deep Dive
Discover how routers forward packets hop-by-hop, how ARP resolves IP addresses to MAC addresses on …
64 minNAT & DHCP Explained: How Your Network Gets Addresses and Shares the Internet
Discover how DHCP automatically assigns IP addresses using the DORA sequence (Discover, Offer, Requ…
59 minTransport Layer
Transport Layer Explained
Master the Transport Layer — from port-based multiplexing and UDP's 8-byte simplicity to TCP's full…
60 minUDP Explained
Master UDP — the minimalist transport protocol powering DNS, VoIP, gaming, DHCP, NTP, and 30% of we…
45 minSocket Programming Fundamentals
Master socket programming fundamentals — from the Berkeley socket API and the 5-tuple identity mode…
49 minQuality of Service
Master Quality of Service — from best-effort vs DiffServ/IntServ models to DSCP field encoding, LLQ…
48 minApplication Layer
Application Layer
Master the Application Layer — how DNS resolves names through a recursive 8-step query, how HTTP/2 …
49 minDNS Explained
Master DNS end-to-end — from the root zone and TLD hierarchy to forward and reverse zone files, SOA…
71 minClient-Server vs. Peer-to-Peer
A hands-on Application Layer tutorial covering client-server vs. peer-to-peer architecture, with an…
22 minInformation Security
Cryptography Basics
Master the mathematics of digital secrets — from AES-256 symmetric encryption and RSA/ECC asymmetri…
54 minDigital Signatures, Certificates
Understand how digital signatures, X.509 certificates, and SSL/TLS 1.3 combine to secure every HTTP…
35 minWireless
Wireless Frame Types & Headers
A deep-dive into 802.11 wireless frames — Management, Control, and Data types, the Frame Control fi…
21 min802.11 Management Frames
Deep-dive into Wi-Fi Management frames — every subtype, the anatomy of Beacons and Probe Requests, …
26 min2G 3G 4G 5G 6G Explained
Four decades of mobile networks, one tutorial. Compare 2G through 6G side by side — GSM, UMTS, LTE,…
27 min