Computer Networks
Understand how computers communicate, how data travels across the internet, and how networking protocols work together. Learn the fundamentals, explore real-world examples, and prepare for technical interviews.
Learn networking step by step
Follow a logical sequence, from foundational concepts to the protocols that power modern applications.
Fundamentals
Networks, models, devices and data transmission.
Start learning → 02IP & Routing
Addressing, subnetting, packets and routing.
Start learning → 03Transport
TCP, UDP, ports, reliability and congestion.
Start learning → 04Applications
DNS, HTTP, HTTPS, sockets and web communication.
Start learning →Understand these concepts first
These foundational questions connect multiple networking concepts and provide a useful starting point.
What is a Computer Network?
Understand network communication and its purpose.
What Happens When You Type a URL?
Follow a browser request from DNS to the server response.
OSI Model
Learn the seven layers and their responsibilities.
TCP vs UDP
Understand two fundamental transport protocols.
DNS
Discover how domain names are resolved into IP addresses.
IP Addressing & Subnetting
Learn how devices are addressed and networks are divided.
Explore Computer Networks
Search for a concept, browse a category, or expand a section to explore the topics in detail.
Study tip: Understand the purpose of each protocol first, then learn how it works, when it is used, and how it interacts with other layers.
Networking Fundamentals Build a strong foundation before studying protocols. 01 ⌄
Physical & Data Link Layers Signals, network devices, frames and local communication. 02 ⌄
Network Layer & IP Addressing Understand packets, logical addresses and internetworking. 03 ⌄
Routing & Network Architecture Learn how packets find their way across networks. 04 ⌄
Transport Layer: TCP & UDP Understand end-to-end communication and reliability. 05 ⌄
Application Layer & Web Protocols Explore the protocols used by browsers and applications. 06 ⌄
Network Security & Cryptography Learn how network communication is protected. 07 ⌄
Advanced Networking & Practical Concepts Connect theoretical knowledge to real systems and troubleshooting. 08 ⌄
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Don’t just memorize protocols. Understand how they work together.
For example, opening a website can involve DNS resolution, routing, local network addressing, TCP or QUIC, TLS, and HTTP. Understanding the complete request flow helps you connect individual concepts and explain them confidently in interviews.
Frequently Asked Questions
What is the best order to learn Computer Networks? +
Start with networking fundamentals and the OSI and TCP/IP models. Then study the physical and data link layers, IP addressing and routing, TCP and UDP, application protocols, and network security.
Which Computer Networks topics are important for interviews? +
Prioritize OSI and TCP/IP, TCP vs UDP, the TCP handshake, IP addressing, subnetting, DNS, HTTP and HTTPS, NAT, routing, flow control, congestion control and the complete lifecycle of a browser request. Requirements vary by role.
Should I learn all seven OSI layers? +
Yes. Learn the purpose of each layer and how the OSI model relates to the TCP/IP model. Also understand that the practical Internet protocol suite is commonly described using four layers, with some models using five.
Is Computer Networks useful for software developers? +
Yes. Networking knowledge helps developers understand API requests, browser-server communication, DNS resolution, connection errors, latency, HTTPS, sockets and distributed applications. The depth required depends on the role.
Understand the network
behind every request.
Explore the topics, connect the concepts, and build a stronger foundation in Computer Networks.
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