By E. Bryan Carne
A reference advisor to the codes, protocols, networks, indications and kit that give the opportunity to speak utilizing TCP/IP.
Read or Download A professional's guide to data communication in a TCP/IP world PDF
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Extra info for A professional's guide to data communication in a TCP/IP world
These functions are performed by the network header. 6 Data Link Layer The data link layer transfers data frames over a single communication link without intermediate nodes. When sending, the data link layer: • Adds a header (DH) and a trailer (DT) to form the data link PDU (DPDU). The header includes a flag, class of frame identifier, sequence number, and hardware address of destination on the link. The trailer includes an FCS and a flag. • Copies the frame in case retransmission is requested.
This information is included in the transport header. 5 Network Layer The network layer provides communications services to the transport layer. If necessary, it fragments the TPDU into packets to match the maximum frame limits of the network(s), and reassembles the packets to create the transport PDU. When sending, the network layer: • Encapsulates the TPDU with a header (network header, NH) to form the network PDU (NPDU). The network header provides a destination address. • May break the TPDU into packets to match the capabilities of the network(s).
Peer-to-peer communication is required to check authorizations and agree upon line discipline and the use of markers. They are functions included in the session header. 4 Transport Layer The transport layer is the highest layer in the stack to be concerned with communication protocols. It ensures the integrity of end-to-end communication independent of the number of networks involved, and their performance. It is responsible for the sequenced delivery of the entire message, including error control, flow control, and quality of service requirements (if they are invoked).