You act as the application layer and tell your mail room that the gizmo you are holding in your hand must be shipped to a given mail station within your corporation that happens to be in another city. This is a very simplified explanation, but it gives you some background when we provide more details about layer 2 and layer 3 protocols later in this book.Īs an analogy, think about sending a package from your corporate mail room. On the receive side, the Ethernet layer removes the Ethernet header and then the TCP/IP layer removes the TCP/IP header before the received frames are reassembled into data that is presented to the application layer. Next, an Ethernet header is added and the data frames are transmitted to the receiving device. The data is segmented into frames (packets) and a TCP/IP header is added to each frame before presenting the frames to the Ethernet layer (sometimes simply referred to as layer 2). In this simplified example, the sender application program presents data to the TCP/IP layer (sometimes simply referred to as layer 3). ![]() Example of a simple data center transaction.
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