Chapter 14 - Part2 : Communcation And Technology
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Purpose of Link Layer in TCP/IP protocol suite
• To format the data into frames for transmission • Maps IP addresses to MAC/physical Addresses • To ensure correct network protocols are followed • To enable the upper layers to access physical medium
Application Layer
• To provide services / interface with the user // access to applications, for example login, file transfer, network file access, email, etc • To provide mechanisms for securing communication e.g. encryption/authentication • To define/provide protocols used to allow the exchange of data/communication // to contain programs that exchange data 4 . Error detection and recovery mechanisms to handle application specific errors
Link Layer
To identify the intended network and the host To add header containing IP addresses To prepare packets for delivery by formattinh in datagram # To route datagram through optimum over a network
Transport Layer
MP1 To provide services / interface with the user // access to applications, for example login, file transfer, network file access, email, etc MP2 To provide mechanisms for securing communication e.g. encryption/authentication MP3 To define/provide protocols used to allow the exchange of data/communication // to contain programs that exchange data MP4 Error detection and recovery mechanisms to handle application specific errors