What is a network?
What is a network?: two hosts, one link, one protocol. Part of the free Link to NetEra networking curriculum.
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Fundamentals
What a network is, OSI, TCP/IP
LANs, WANs & topologies
LANs, WANs & topologies: two LANs joined by a WAN link. Part of the free Link to NetEra networking curriculum.
The OSI Model
What the OSI model is, what each of the seven layers does, how encapsulation works, and how to troubleshoot layer by layer: traced with one real web request.
The TCP/IP stack
What the TCP/IP model is, how its four layers map to OSI, what runs at each layer, and when to choose TCP vs UDP: the working model behind every packet capture.