how to make barcodes in excel 2010 SECT/ON 233 in Software

Generation Code 39 Full ASCII in Software SECT/ON 233

SECT/ON 233
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delivering the bytes in order to the other site The situation is similar to creating a bridge that spans multiple islands and passing all the bytes from one island to another in one single connection We will discuss this feature later in the chapter
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TCP is a reliable transport protocol It uses an acknowledgment mechanism to check the safe and sound arrival of data We will discuss this feature further in the section on error control
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TCP Features
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To provide the services mentioned in the previous section, TCP has several features that are briefly summarized in this section and discussed later in detail
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Although the TCP software keeps track of the segments being transmitted or received, there is no field for a segment number value in the segment header Instead, there are two fields called the sequence number and the acknowledgment number These two fields refer to the byte number and not the segment number
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Byte Number TCP numbers all data bytes that are transmitted in a connection Numbering is independent in each direction When TCP receives bytes of data from a process, it stores them in the sending buffer and numbers them The numbering does not necessarily start from O Instead, TCP generates a random number between 0 and 232 - 1 for the number of the first byte For example, if the random number happens to be 1057 and the total data to be sent are 6000 bytes, the bytes are numbered from 1057 to 7056 We will see that byte numbering is used for flow and error control
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The bytes of data being transferred in each connection are numbered by TCP The numbering starts with a randomly generated number
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Sequence Number After the bytes have been numbered, TCP assigns a sequence number to each segment that is being sent The sequence number for each segment is the number of the first byte carried in that segment
Example 233
Suppose a TCP connection is transferring a file of 5000 bytes The first byte is numbered 1O,00l What are the sequence numbers for each segment if data are sent in five segments, each carrying 1000 bytes
Solution
The following shows the sequence number for each segment:
Segment 1 Segment 2 Segment 3 Segment 4 Segment 5
Sequence Number: Sequence Number: Sequence Number: Sequence Number: Sequence Number:
10,001 (range: 10,001 to 11,(00) 11,001 (range: 11,001 to 12,000) 12,001 (range: 12,001 to 13,000) 13,001 (range: 13,001 to 14,000) 14,001 (range: 14,001 to 15,000)
PROCESS- TO-PROCESS DEliVERY: UDp, TCP, AND SCTP
The value in the sequence number field of a segment defines the number of the first data byte contained in that segment
When a segment carries a combination of data and control information (piggybacking), it uses a sequence number If a segment does not carry user data, it does not logically define a sequence number The field is there, but the value is not valid However, some segments, when carrying only control information, need a sequence number to allow an acknowledgment from the receiver These segments are used for connection establishment, termination, or abortion Each of these segments consumes one sequence number as though it carried 1 byte, but there are no actual data If the randomly generated sequence number is x, the first data byte is numbered x + 1 The byte x is considered a phony byte that is used for a control segment to open a connection, as we will see shortly Acknowledgment Number As we discussed previously, communication in TCP is full duplex; when a connection is established, both parties can send and receive data at the same time Each party numbers the bytes, usually with a different starting byte number The sequence number in each direction shows the number of the first byte carried by the segment Each party also uses an acknowledgment number to confirm the bytes it has received However, the acknowledgment number defines the number of the next byte that the party expects to receive In addition, the acknowledgment number is cumulative, which means that the party takes the number of the last byte that it has received, safe and sound, adds I to it, and announces this sum as the acknowledgment number The term cumulative here means that if a party uses 5643 as an acknowledgment number, it has received all bytes from the beginning up to 5642 Note that this does not mean that the party has received 5642 bytes because the first byte number does not have to start from O
The value of the acknowledgment field in a segment defines the number of the next byte a party expects to receive The acknowledgment number is cumulative
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