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Definition
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Identifies which application is sending the information Identifies which application is to receive the information Maintains reliability and sequencing Used to acknowledge received information Number of 32-bit words that make up the header Currently not used (set to all zeroes) Defines control functions, such as synchronization Indicates the number of segments allowed to be sent before waiting for an acknowledgment from the destination Cyclic redundancy check (CRC) of the header and encapsulated application data Points to any urgent data in the segment The only option currently defined is the maximum TCP segment size to use for the session Application data (not part of the TCP header)
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UDP uses a best-effort delivery system, similar to how first class and lower postal services of the US Postal Service work With a first class letter, you place the destination address and return address on the envelope, put it in your mailbox, and hope that it arrives at the destination With this type of service, nothing guarantees that the letter will actually arrive at the destination, but in most instances, it does If, however, the letter doesn t arrive at the destination, it s up to you, the letter writer, to resend the letter: the post office isn t going to perform this task for you UDP operates under the same premise: it does not guarantee the delivery of the transport layer segments While TCP provides a reliable connection, UDP provides an unreliable connection UDP doesn t go through a three-way handshake to set up a connection it simply begins sending the data Likewise, UDP doesn t check to see whether sent segments were received by a destination; in other words, it doesn t use an acknowledgment
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process Typically, if an acknowledgment process is necessary, the transport layer (UDP) won t provide it; instead, the application itself, at the application layer, will provide this verification Given these deficiencies, UDP does have an advantage over TCP: it has less overhead For example, if you need to send only one segment and receive one segment in reply, and that s the end of the transmission, it makes no sense to go through a three-way handshake to establish a connection and then send and receive the two segments; this is not efficient DNS queries are a good example in which the use of UDP makes sense Voice and video are two other applications that commonly use UDP; assuming that the network path to the destination is fairly reliable and not many packets are dropped, the listener in a phone conversation or the viewer in a video application probably won t notice that every now and then a packet is lost Of course, if you are sending a large amount of data to a destination, and you need to verify that all of it was received, TCP would be a better transport mechanism When transmitting a UDP segment, an IP header will show 17 as the protocol number in the protocol field Table 9-2 shows the components of a UDP segment Notice the UDP is more ef cient many differences between UDP and TCP than TCP because it has less overhead segments First, since UDP is connectionless, sequence and acknowledgment numbers are not necessary Second, since there is no flow control, a window size field is not needed As you can see, UDP is a lot simpler and more efficient than TCP Its only reliability component, like TCP, is a checksum field, which allows UDP, at the destination, to detect a bad UDP segment and then drop it Any control functions or other reliability functions that need to be implemented for the session are not accomplished at the transport layer; instead, these are handled at the application layer
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TABLE 9-2
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