By E. Bryan Carne
A reference advisor to the codes, protocols, networks, indications and kit that give the chance to speak utilizing TCP/IP.
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Additional resources for A professional's guide to data communication in a TCP/IP world
Implements error and flow controls. • Responds to flags to establish duplex connection. • Notes window size of destination and any options requested by destination. • Calculates a checksum and confirms it is all ones when added to the ones complement transmitted in the checksum field. If it is not, it discards the frame. • Notes requests for options. • Passes APDU to port designated for this application. 3 Internet Layer The Internet layer supports a connectionless procedure called Internet Protocol (IP).
Passes the frame to the physical layer. When receiving, the data link layer: • Reconstructs the DPDU from the bit stream received from the physical layer. • Removes both header and trailer from the DPDU. • Verifies FCS and other layer information. • Discards the frame if the checks are not conclusive. • Passes a correct NPDU on to the network layer. • Requests resend, if necessary. Peer-to-peer communication is required to agree on data link protocol parameters, error detection information, and error correction procedures.
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).