23-12-2017, 04:21 PM
World Wide Web (WWW)
*WWW was invented by
Ans : Tim Berners Lee
*Head quarters of WWW
Ans : Geneva
*World Wide Web is a system of interlinked documents accessed through internet.
*In India World Wide Web Information Service was launched on 14th January 1995.
*W3C stands for World Wide Web Consourtium
*Hyperlink : - It is a link, when user click on this, it directs user to related document.
*URL : Uniform Resource Locator
*URL is an address used to identify the name of a web resource.
*In other words it is a web address which indicates web page.
*Example for a URL - http://www.intemet.com
*Part of the URL which indicates particular webpage is known as
Ans : Domain name
*In “http://www.google.com” domain name is
Ans : google.com
*Every domain name has a suffix that indicates top level domain it belongs to
*Service which is used to translate domain name to IP address - DNS (Domain Name System)
*Suffixes indicating top level domains
Ans : .gov - Government agencies
.edu - Educational institutions
.org - Organizations
.mil - Militaiy
.net - Network Organizations
Cookie
*Cookie is also known as http Cookie or web cookie
*Cookies are created when user’s browser loads a particular website.
*Everytime the user loads the website the browser sends the cookie back to the server to notify the website of the user’s previous activity.
Super Info
Unwanted or non-requested e-mails received in a folder is known
Ans : Spam
Info Plus
*Pages consist of information on world wide web is known as
Ans : Webpages
*Web browsers retrieve web. pages from web servers.
Protocols
*Hyper Text Transfer Protocol (HTTP):- http is the foundation of data communication for the World Wide Web.
http ://www.
*http protocol defines how messages are formatted and transmitted, and what actions Web Servers and browsers should take.
*http is a stateless protocol.
*Because each command is executed independently, without any knowledge of the commands that came before it.
*URL begins with “http://”
*Hyper Text Transfer Protocol Secure (HTTPS):-
*https is the secure form of http.
*The 's' at the end of http stands for 'secure'
*Which protocol is used for secure communication over internet
(a) IP (b) UDP
(c ) HTTP (d) HTTPS
Ans : (d) HTTPS
(Sales Asst. Gr.II, 2016)
*It means all communications between browser and the website is encrypted
*https is commonly used to protect highly confidential online transactions.
*URL begins with “https://”
*File Transfer Protocol (FTP):- Rules used in a computer network to copy large files from remote computer to requestor’s computer.
*Protocol that helps to send emails SMTP (Simple Mail Transfer Protocol)
*This protocol can only be used to send emails, not to receive them.
*Protocol which is used to receive email -POP3 (Post Office Protocol)
*Protocol used in wireless devices like mobile phone to use internet — WAP (Wireless Application Protocol)
Info Plus
*Address Resolution Protocol (ARP)
ARP is a protocol for mapping the Internet Protocol Address (IP Address) to a hardware address
