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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:23 发布人：wongrs | |
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on on the network. 2. Data is converted to segments and packaged with control information for a reliable connection. 3. Segments are encapsulated with a network header and converted to packets or datagrams, which specify the source and destination logical addresses. 4. Packets, or datagrams, are converted to frames to allow a connection over an interface to the network. 5. Frames are converted to bits with some clocking functions to allow transmission a medium. Key Terms: Bits: The Physical layer takes the binary data down from the Data Link Layer and converts the 1's and 0's to a digital signal to be sent out over the physical topological. Frames: These house the packets, or datagrams, handled down from the Network layer to be delivered to a device on a LAN. Packets: Sometimes called datagrams, these house the segments handed down the Transport layer to be routed through an internetwork. Segments: Defined at the Transport layer, these are part of a data stream that is handed down from the upper layers to be transmitted to a destination device. Ethernet Frame: Preamble, DA, SA, Type, Data, FCS OSI Model: Application layer 7File, print, message, database, and applications. Determines availability of the target host. www, email, ftp, telnet, EDI, quake Presentation layer 6 Text and Data Formatting, Data Encryption, Compression, and Translation services Determines the syntax of the data transfer. Pict, tiff, jpeg, midi, mpeg, quicktime, EBCDIC and ASCII Session layer 5 Service Requests, Dialog control, coordinates the communications, Establishes, Manages, and terminates communication sessions between applications. Offers full or half-duplex define and group formatted data, and offers some session recovery or checkpoint mechanisms between the applications coordinated between the hosts. NFS, SQL, RPC, X Windows, ASP (appletalk session protocol), DNA SCP (digital whatzit) Transport layer 4 ***TCP uses Three-way handshake for Transport test question*** End-to-end communication, flow control provided by sliding windows, and error checking Ensure Data Reliability provided by sequence numbers and acknowledgements NBP Name Binding Protocol it associates with AppleTalk Responsible for hiding t
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