For network admins and network security professionals, one of the most important tools to learn to use is Wireshark (formerly Ethereal), a free and open source network analyzer/packet sniffer ...

Data communication basics, Telephone, cellular, cable and computer networks, Layered network architectures, models, and protocols, Switching, routing, flow control, and congestion control, Medium ...

What is a computer network? That’s not a question you hear on a regular basis, but it is important, nonetheless. Without computer networks, the internet wouldn’t be as efficient as it is today ...