TCP/IP model-Application Layer and other layers and Features TCP/IP

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Application Layer

On top of the transport layer is the application layer.It contains all the higher level protocols. The early ones included virtual terminal (TELNET), FTP,and electronic mail(SMTP),Domain Name System (DNS),NNTP,HTTP.

Host-to-Network Layer
Here the host has to connect to n/w using some protocol so it can send IP packets to it.



Features of TCP/IP

1)File Transfer-FTP,RCP(Remote Copy)

2)Terminal Enuilation-Telnet & rlogin.

3)Transparent distributed file access and sharing-NFS(Network File System)

4)Remote command execution-rsh(remote shell) & rexec(remote execution) programs, users can run programs on remote computers and see the results on their own computer.

5)Remote Printing-unix command lpr provides remote printing services.



Next coming up Comparison of OSI and TCP/IP Reference Models

OSI model-Session Layer,Presentation Layer,Application Layer

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5)The Session Layer
This layer allows users on different machines to establish sessions between them.
Session offer various services including dialog control,token management and synchronization.

6)The Presentation Layer
This layer is concerned with the syntax and semantics of the information transmitted. The presentation layer manages these abstract data structures and allows higher level data structures (eg.banking records) to be defined and exchanged.

7)Application Layer
This layer contains a variety of protocols that are commonly needed by users.One widely used application protocol is HTTP,which is the basis for the World Wide Web.


Next coming up TCP/IP Model..