Last time, I explained the fundamentals of the fifth layer of the OSI framework: the session layer. The session layer establishes, manages, and terminates the connections between applications. It also sets up, coordinates, and terminates conversations, exchanges, and dialogues between the different applications at each end. It deals with session and connection coordination.
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In my last post, we explored the fourth layer of the OSI framework: the transport layer. As we saw, this layer is responsible for a transparent data flow between end…
In my last post, we explored the third layer of the OSI framework: the network layer. As we saw, switching and routing technologies are part of this layer, transmitting data from endpoint to endpoint. Routing technologies create logical paths.
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In the last post, we explored the second layer of the OSI framework. As we saw, data packets are part of this layer and are encoded and decoded into bits. You can do this with supportive tools that you can categorize as sublayers of layer two: a MAC address and a Logic Link Controller.
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In my previous post, we started the journey through networking by following the OSI framework. With this framework, you get a clear overview of how you set up a network correctly. It also gives you a solid troubleshooting guideline in case of problems in your (organization’s) network.
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When you encounter complex technologies, you need to simplify the process by breaking it down into simple, isolated processes and actions. This is done by using a network model. Practice is important but without a guideline/roadmap you might get stuck or come up with a solution that is not the most optimal one.
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Most companies do not have an extra security layer when a client computer connects to the wired network. When connecting to a network, the client computer receives an IP from a DHCP (Domain Host Configuration Protocol: the “IP generator”). At this point, a client computer is not identified or authenticated on a wired network and attacks based on the hacker’s knowledge can be launched.
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