Now, we've seen how the OSI model organizes the responsibilities of transmitting data. Hopefully, by this point, it should be clear how each layer in the stack is intended to provide a reliable abstraction for the layer above it. However, the process of communicating with a remote host, in its entirety, may still seem a bit vague. So, let's consider a concrete example and address each of the concepts that we talked about as they arise through the process of data transmission.
First, let's assume that an entity on layer 5 of our host (the session layer) wants to establish a session with an entity on Layer 5 in a remote host. I haven't said so explicitly until now, but we can always assume that an entity on a given layer ...
