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insure reliable communication over the inherently unreliable IP network layer. The end-to-end (transport) layer protocol performs this magic every day. END-TO-END (TRANSPORT) LAYER PROTOCOL The transport layer protocol of the internet is transmission control protocol (TCP). TCP uses the IP layer to send messages through the internet, and TCP adds a whole set of services that together insure that complete messages always arrive, uncorrupted, in order, without duplication of data, at the intended destination, regardless of hardware or network failures or changes during the time the many datagrams comprising the message are being sent. TCP is a connection-oriented protocol, which means that the two computers first establish a connection with one another before either begins sending data. To do this, one computer, the server, reserves a port for communication. Some writers call this the passive open of a connection, for nothing happens outside of the server; the server simply makes itself ready to communicate. When another computer, the client, wishes to communicate with the server, the client contacts the server requesting a connection. This step is sometimes called the active open. To do so, the client must identify the server, and must know in advance the port on which the server is listening. Since each computer has thousands of ports available, you may be wondering how the typical client application could possibly guess on which port to call the server The answer is that the use of a small number of ports is standardized, and those port numbers are well known. For instance, web servers listen on port 80, so all of those visits you make to websites are really contacts with web server programs listening on port 80 of the web server computer. After the client contacts the server, the client waits for an acknowledgement from the server of the client s request to open a connection. When the client receives one, the client acknowledges back to the server that the client has received the server s acknowledgement. At this time, both computers have established a connection on which to communicate. This three-step connection establishment protocol may remind you of how people use telephones. We dial the other person (the server, or object of connection), we hear the other person pick up the phone and say, Hello, (akin to the server s acknowledgement of the client s open request), and we identify ourselves in confirmation, Hi. This is Carl, (confirming the server s acknowledgement). Once we have established the connection with one another, we proceed to exchange information with each other. Once the TCP connection is established, the client and server begin to exchange messages and data. The TCP protocol uses sequence numbers to indicate the order in which pieces of the total message go together. Both the client and server exchange initial sequence numbers (ISNs) during the connection establishment exchange. One number is used for messages from the client to the server, and one is used for messages in the other direction. When the client sends a message, the client labels the message with a sequence number. The client expects the server to acknowledge receipt of the message by responding with a sequence number one greater than the one sent. If the client does not receive confirmation of a message it sent within a set period of time, the client assumes that the message was lost, and the client sends the same message, with the same sequence number, again. On the server side, the server can use the sequence numbers to determine if it receives the same message twice. If a client mistakenly sends a message twice when the server already received the message, the server can simply discard the duplicate message. Since different pieces of a message may travel by different routes to the destination, it s possible for component pieces of a message to arrive out of order. The sequence numbers on messages make it possible to put the pieces into correct order before delivering the full message to the application (e.g., the web server or the web browser). Both the header and the data in a TCP packet are protected with a checksum. This allows the TCP protocol to insure that data in the message have not been corrupted. As you can imagine by now, if the destination computer detects corrupted data in a packet, it can simply ask the sender to resend data corresponding to a particular sequence number. We have simplified the discussion of sequence numbering somewhat in hopes of making it easier to understand conceptually. In practice, every byte in a TCP message is sequenced. The message header in a TCP packet
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