Features of Computer Network
1) Communication Speed:- Network provides us to communicate over the network in a fast and efficient manner, for example:-We can do video confrencing , email messaging etc.Over the internet. Therefore,the compiler network i a great way to share our knowledge and video.
2) File sharing:- File sharing is one of the major advantages of the computer network. Computer network provides us to share the files with each other.
3) Back up and Roll back is easy:- Since the files are stored in the main server which is centrally located ,therefore it is esay to take the back up from the main server.
4) Software and hardware sharing:- We can install the application on the main server therefore, the user can access the application centrally. So we don't need to install the software on every machine similarly, hardware can also be shared.
5) Security:- Network allows the security by assuring that user has the right to access the certain files and applications.
ARPANET
Advanced research projects agency network, ARPANET or ARPAnet developed in 1966 by the united states ARPA. ARPANET was a wide area network linking many universities and research center, was first to use packet switching and was the beginning of what we consider the internet today ARPANET was created to make it easier for people to acces computers, improve computer equipment and to have more effective communication method for the military.
World Wide Web (WWW)
The world wide web (www) is a network of online content that is formatted in HTML and accessed via HTTP. The term refers to all the interlinked HTML pages that can be accessed over the internet. The world wide web was orignally designed in 1991 by Tim berner Lee
Packet switching
Packet switching is a digital network transmission process in which data is broken into suitabl-size,piece or blocks for fast and different transfer via different network devices. when a computer attempts to send a file to another computer,the file is broken into packets so that it can be sent accross the network in the most efficient way. These packets are then routed by network devices to destination.
1) In connectionless packet switching each packet has the following information written in its header section.
2) The destination address.
3)The source address.
4)Total number of pieces.
5) The sequence number (seq#) needed to enable reassembly.
After reaching the destination through different routes the packets are rearranged to form the original message.
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