Computer Networks Advanced
Computer networking is the discipline that explains how devices exchange data, from a sensor sending a reading across a cable to a browser loading a page from a server on another continent. It matters because nearly every digital service depends on networks behaving predictably, and engineers who understand the underlying structure can design, troubleshoot, and secure those systems rather than guess. The subject is organized as a stack of layers, each solving one part of the problem and relying on the layers beneath it. This guide introduces that stack from the bottom up, with a dedicated article for each branch.
Layered Network Models and the Physical Layer
This branch introduces the layered approach to networking through the OSI and TCP/IP models, which divide communication into functional layers with defined responsibilities. It also covers the physical layer, which carries raw bits as signals over a transmission medium. Each layer's protocols are treated in the branches that follow.
Data Link Layer
This branch covers how the data link layer delivers frames between directly connected nodes. It addresses framing, error detection, MAC addressing, and Ethernet, which together make a shared link usable and reliable. The child topics detail each mechanism.
Network Layer
This branch explains how hosts are addressed and how packets travel across multiple interconnected networks. It spans IP addressing, subnetting, routing, and the routing protocols that determine paths. This layer is what allows traffic to cross from one network to another instead of stopping at the local link.
Transport Layer
This branch covers end-to-end communication between processes on different hosts, using TCP and UDP. It addresses reliable delivery and congestion control, the mechanisms that determine whether data arrives intact and how quickly it can be sent without overwhelming the network. The child topics examine each area in depth.
Application Layer
This branch covers the application protocols that run on top of the transport layer. It includes DNS for translating names into addresses, HTTP for communication between web clients and servers, and SMTP for moving email between servers. Each protocol receives its own detailed article.
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