c# barcode scanner text box Figure 5-19 The OSI model and the names used for pieces of information in Software

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Figure 5-19 The OSI model and the names used for pieces of information
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Microsoft Windows Server 2008: A Beginner s Guide
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sliding window size, urgent pointer, and options to carry on a very complex conversation about how a transmission is progressing And all of it is happening in very small fractions of a second Source Port The port number in the Session layer, called a socket, that is sending the data Destination Port The port number in the Session layer, or socket, that is receiving the data Sequence Number A number sent to the receiver to tell it where the segment fits in the data stream Acknowledgment Number A number sent to the sender to tell it that a segment was received; the sequence number increments by 1
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Source port 2-bytes
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Destination port 2-bytes
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Not used 6-bits
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Checksum 2-bytes
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Figure 5-20 The TCP segment header
5:
Windows Server 2008 Networking Environment
Header Length The length of the header and therefore the offset from the start of the header to the data URG ACK The Urgent field; if 1, the Urgent Pointer is valid The Acknowledgment field; if 1, the Acknowledgment Number is valid
PSH The Push field; if 1, the receiver is not to buffer data, but instead to send it directly to the application, as with real-time audio and video RST The Reset field; if 1, the communication must be interrupted and the connection reset SYN The Synchronize field; if 1, a connection is requested by the sender; if accepted, the receiver leaves SYN = 1 and makes ACK = 1 FIN The Finish field; if 1, the transmission is to be terminated Window Size The number of bytes that the receiver can accept in the next transmission Checksum A number with which to check the integrity of the segment Urgent Pointer If URG = 1, this is a number used as an offset to point to an urgent piece of information the receiver should look at Options Used for special circumstances; normally absent Padding Used to ensure that the header is in multiples of 4 bytes
TIP The general TCP specification is in RFC 793, which is available from http://wwwietforg/rfc html The functions performed by TCP and IP the packaging, addressing, routing, transmission, and control of the networking process in a very complex environment are mind-boggling When you add to that the ease and reliability of networking, it is truly stunning Now that you know all the networking ingredients presented in this chapter, isn t it amazing that networking works even in a small workgroup, let alone the Internet That the Internet is such a worldwide success has to be one of the great wonders of the modern world At the beginning of this chapter, I stated that networking is the single most important facility in Windows Server 2008 Having read this chapter, you can see that the job of networking is a very complex task with many demands, and for Windows Server 2008 to handle it well is a tall order In the next chapter, you ll see how Windows Server 2008 tackles these demands, and how to control what Windows Server 2008 does I think you ll conclude that Windows Server 2008 is well suited to this most important function
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Setting Up and Managing a Network
Microsoft Windows Server 2008: A Beginner s Guide
hen you installed Windows Server 2008, a basic set of networking services was installed and configured using your input and system defaults This setup may, but doesn t always, provide an operable networking system In any case, you have a wide spectrum of networking alternatives to review and set to provide the networking environment best suited to your needs The purpose of this chapter is to do just that, first by looking at how to set up basic networking in Windows Server 2008, and then by looking at how to set up Windows Server 2008 to support the rest of the network Basic networking means that the computer can communicate with other computers in the network To do that, you must do the following: Assure the network adapter or interface card (NIC) is properly set up Install the networking functions that you want to perform Click and configure a networking protocol
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