Explain About Internet

         Explain About Internet

What Is Internet?

The Internet is defined as a network of network in which users can get information from any other computer in the network, if they have permission. In other words the internet is a public cooperative, and self-sustain facility accessible to million of people. World wide services provided by the internet are World wide web(WWW), file transfer(FTP), email(SMIP, POP), vision conferencing, Telnet, file sharing, Internet relay chat, IP Telephone and IPTV.

The Internet has no single unified administration in either mechanical execution or arrangements for access and use; every constituent organization sets its own approaches. The overextending meanings of the two chief name spaces in the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are coordinated by a maintainer association, the Internet Corporation for Assigned Names and Numbers (ICANN). The specialized supporting and normalization of the center conventions is an action of the Internet Engineering Task Force (IETF), a non-benefit association of inexactly subsidiary worldwide members that anybody might connect with by contributing specialized skill. In November 2006, the Internet was remembered for USA Today's rundown of New Seven Wonders.

History of Internet

The u.s Department of defence laid the foundation of the internet with a network called "ARPANET". However, the general public did not use the Internet much until after the development of the world wide web in the early 1990s. In 1957, u.s government formed the Advanced Research Project Agency(ARPA), a segment of the department of defence charged with ensuring u.s leadership in science and technology with military applications in 1969, ARPA established ARPANET, the foreigner of the Internet. ARPANET  was a network that connected major computers at the universities and other educational and research institute later.

What Is Data Validation & Data Verification

 Data Validation & Verification

Data validation

Data validation is done by the and there are three type of data validation.

(01)Type Check

In here the data type is checked into insure that. The type of the input data is correct before storing in a data base.

Ex:- It a text box which indicate the data in a form must be inserted the data a note.

(02)Presence Check

There are some key data which is used to identify other data in a data set. Presence check is checking out if the key data is available. 

Ex:- After filling a web application form the system will check those mandetary check boxes, weather they are filled or not.

(03) Range Check

There are different type of data that contains different ranges in a data set. In here the range is checked after the input process of data.

Ex:- Some passwords are programme to be consitern a certein range of character  set. If the enters password most less than the given range a massage will popup.

Data Verification 

The data Verification is done by the answer. There are three different method of data Verification.

(01)Visual Check

Visual check is checking errors by logging to the data.

Ex:-After entering a password there is a sign of eye. In this option we can see what we entered.

(02)Double Keying 

This method is used to check transecription errors. In here data will be entered twice( by two peoples) The computer will only accept the data from processing. If the two vertions are identical.

(03) Parity Check 

This is used to check transmission errors or it between memory and a disk. In generally, parity check is the quality of being even or odd. In parity check the recerverces end checks the received data check. To check weather is qualities even or odd.