A sender host sends the data to the receiver host with a port number. In general, a single IP address is assigned to a host. Certainly, there can be multiple types of processes that may run on a single host at a particular time. It’s important to note that the use of ports is crucial in the transport layer. The type of postcard represents different types of processes: Jack and Jones are the IP addresses of the two hosts. In this example, Home-A and Home-B are two different networks. So, in order to deliver the postcard to the correct address, he needs to write the details on the postcard, such as the address, name of the receiver, and type of postcard. Jack belongs to Home-A, and Jones belongs to Home-B. There are two houses, Home-A, and Home-B. Let’s take a real-life example of a postcard delivery. The transport layer ensures the communication between the process of a host to the process of another host.įor the process to process communication, the transport layer uses a port number assigned to each process uniquely. There might be more than one process running on the host. A process is an application running on the host system.
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