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has the starting sequence number, and the receiver will increment that number by the number of bytes in the message. The receiver will expect the next packet to start with the incremented number plus one. The sequence numbering scheme insures correct sequencing of bytes in the message, efficient resending of corrupted or lost packets, and correct disposal of duplicate packets. Yet another service of the TCP protocol is regulating the speed of senders. Data communications people refer to this as flow control. With every message and acknowledgement, each computer informs the other of the number of bytes it is ready to receive. This number of bytes is known as the data window. If a fast sender starts to overrun a slower receiver, the acknowledgement for a packet will soon show a zero for the data window. The sender will stop transmitting until it receives another packet from the receiver announcing that it has room in its data window again. To the application programs on both sides of the connection, TCP presents a byte stream of the data, very much like a file. Applications can write to and read from a TCP connection very much as they would write and read files. APPLICATION LAYER The application layer is everything above the transport, network, and data-link layers. Application programs such as web browsers, file transfer programs, web servers, distributed data bases, and electronic mail use the application program interface (API) of the network protocol stack, and libraries of common networking routines, to access other computers over the network. The Java language also has many built-in classes that make network programming much easier. PUTTING IT ALL TOGETHER To put it all together, envision this. A web server is in the middle of sending a file containing HTML text to a web browser. The web server has just read the next line of the file, so it writes the line to the TCP socket the server opened for communication with the browser. To the web server, this write operation is very much like writing to a file. When the TCP software receives the buffer of text, it builds a header for a TCP packet that, among other details, includes the source and destination IP addresses and port numbers of the two computers, and the sequence number information. The TCP software also computes the checksum for the header and data of the TCP packet, and writes the checksum into the header. When the header is complete, the TCP software passes the original line from the file, prefixed with the TCP header, as a single buffer (a buffer is a series of bytes) to the IP protocol. The IP software may separate the full TCP buffer into several smaller series of bytes. For each IP packet, the IP software builds an IP header that includes the source and destination IP addresses, and a variety of other details. The IP software calculates a checksum for the IP header, and inserts that number in the checksum field of the IP header. As the IP software constructs each IP packet, the IP software passes each packet to the data link software, which in most cases today means the driver for the network interface. However, if the destination IP address is not on the local network, the command to the data link layer tells the data link layer to send the message to the local router, or gateway, computer. The data link software will build an appropriate data link header of its own, whose format depends on the type of data link, and write the bits to the destination computer. At this point, the destination computer is either another computer on the local network, or a router attached to the local network. When the IP packet arrives at the router, the router s data link software will remove the data-link-level header, and forward the IP packet to the IP software. The IP software in the router will check the IP header checksum, and consult its tables to decide where to forward the message in order best to move the message toward its destination. The IP software will pass the IP packet back to the data link layer of the router, with instructions to send the packet over the adjoining network to the appropriate computer, or to the next router. Eventually the destination computer will be a local computer on a network served by the last router in the chain. When the data link software at the destination computer receives the message, the data link software will strip the data link header from the IP packet, and pass the IP packet to the IP software. The IP software
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