Internet Protocol Suite

Introduction

• A set of communication protocols or rules for internet

• There are four layers in internet protocol suite– Application layer– Transport layer– Internet layer– Link layer

Introduction

The process is just opposite in receiving and sending in the network.

History

• ARPANET• Research conducted by DARPA developed

TCP/IP in mid 1970s• First used in military computers• The switch from ARPANET to TCP/IP was

officially completed in 1st Jan 1983

Internet Protocols

TCP• Lies in the transport layer• Converts data, images into small packets

to transport them through the network• Sends packets in order with minimal errors• Eliminates duplicate data and resends lost

and discarded packets

Internet Protocols

IP• Lies in internet layer• Responsible for addressing each packets

to its destination• Responsible for selecting best route to

sent the packets to its destination

Internet Protocols

TCP/IP working together

• Same as the working during shifting our residence to new location

Internet Protocols

Internet Protocols

HTTP• Hypertext Transfer Protocol• lies in application layer• Functions as request-response protocol in

client server computing model• State less protocol

Internet Protocols

FTP• File Transfer Protocols• Also a request-response protocol• Used for uploading and downloading• Differs from HTTP on the basis of

responses

Internet Protocols

HTTPHTTP request

HTTP Client HTTP Server

Respond

Internet Protocols

FTP

FTP client FTP Server

FTP request

Response

Actual file not in the form of hypertext

Internet Protocols

Telnet• Developed in 1969• Lies in application layer• Allows you to access someone else’s

computer• Remote login• telnet differs from HTTP and FTP

Conclusions

• Internet protocol suite is nothing but a set of rules for communication

• Such rules are very necessary as nowadays because of increasing numbers of computers in internet

• It has been very helpful to all mankind