1007ICT Study Guide - Final Guide: Data Link Layer, Public-Key Cryptography, Transport Layer
Document Summary
Week 10 - weekly assessment (2 marks: explain the functions of the transport layer in the osi model. Tcp is connection-oriented protocol and provides same functionality as transport layer in osi model. Its reliable service because packets are transported with sequence numbers to prevent the data loss. Its difficult to find lost/duplicated packets through udp because there are no sequencing numbers on packets. Retransmission of lost data packets is possible through tcp. Retransmission of lost data packets is impossible through udp. Tcp is comparatively slower than udp but reliable protocol. Udp is faster than tcp e. g. www, ftp. Udp is faster than tcp e. g. www, ftp e. g. video screening: explain the difference between data link layer error control and the transport layer error control. Data link layer only detects errors that occur within a single physical network. Transport layer detects errors that occur during whole from one network to another transmission.
