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One of the issues of a connection-oriented service such as TCP is that they typically go through a handshake process before data can be transferred, and then acknowledge that all data sent was received In some instances, such as file transfers, this makes sense, because you want to ensure that all data for the file is transferred successfully However, in other cases, when you want to send only one piece of information and get a single reply back, going through a handshake process adds overhead and delay that typically isn t necessary In TCP/IP, a domain name service (DNS) query is a good example of when using a connection-oriented service doesn t make sense With a DNS query, a device is trying to resolve a fully qualified domain name to an IP address The device sends the single query to a DNS server and waits for the server s response In this process, only two messages are generated: the client s query and the server s response Because of the minimal amount of information shared between these two devices, it makes no sense to establish a reliable connection first before sending the query Instead, the device should just send its information and wait for a response If a response doesn t come back, the application can send the information again or the user can get involved With operating systems implementation of DNS, you can configure two DNS servers in your TCP/IP adapter settings If you don t get a reply from the first server in an application, the application can try to use the second configured server
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Because no connection is built up front, this type of connection is referred to as a connectionless service The TCP/IP protocol stack uses the UDP to provide unreliable or connectionless connections UDP is discussed in more depth in 9
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Another function of the transport layer is to set up, maintain, and tear down connections for the session layer that is, it handles the actual mechanics for the connection The information transferred between networking devices at the transport layer is called a segment Segmentation is necessary to break up large amounts of data into more manageable sizes that the network can accommodate A good analogy of this process is it s easier to pour pebbles down a pipe than giant boulders
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Because multiple connections may be established from one component to another component or components, some type of multiplexing function is needed to differentiate between data traversing the various connections This ensures that the transport layer can send data from a particular application to the correct destination and application, and, when receiving data from a destination, get it to the right local application To accomplish this feat, the transport layer typically assigns a unique set of numbers for each connection These numbers are commonly called port or socket numbers A source port number and a destination port number are assigned for each connection The destination port numbers assigned by the source device are sometimes referred to as well-known or reserved port numbers The source device uses an appropriate port number in the destination port field to indicate to the destination which application it is trying to access For example, the TCP/IP protocol stack gives each application a unique port number Some well-known port numbers used by TCP/IP applications are FTP (20 and 21), telnet (23), SMTP for e-mail (25), DNS (53), TFTP (69), WWW (80), and POP mail (110) With TCP/IP, port numbers from 0 to 1023 are well-known port numbers However, some applications have port numbers higher than these numbers Actually, TCP/IP uses a 16-bit field for the port number, allowing you to reference up to 65,536 different numbers Port numbers above 1023 are used by the source to assign to the connection as the source port number Each connection on the source has a unique source port number This helps the source device differentiate its own connections This process is discussed in more depth in 9
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