Internet
Services of Internet
E-mail ::The internet enables user to exchange data/information and communicate via electronic media. E-mail messages are usually encoded in American Standard Code for Information Interchange (ASCII) text. A popular protocol for sending e-mail is Simple Mail Transfer Protocol (SMTP) and for receiving it is POP3.
Chat ::
It is the exchange of typed message by netizens. It enables netizens to ‘talk not vocal’ by typing and sending the messages back and forth. It has two modes—computer to telephone and computer to computer. Internet Relay Chart (IRC) developed by Jarkko Oikarinen in 1998.
It is the exchange of typed message by netizens. It enables netizens to ‘talk not vocal’ by typing and sending the messages back and forth. It has two modes—computer to telephone and computer to computer. Internet Relay Chart (IRC) developed by Jarkko Oikarinen in 1998.
Video Conferencing ::
A service that allows a group of users to exchange video information over the internet. It include an audio teleconference facility. Each participant’s computer must have a camera, microphone and earphones (or speaker).
A service that allows a group of users to exchange video information over the internet. It include an audio teleconference facility. Each participant’s computer must have a camera, microphone and earphones (or speaker).
Important Terms of Internet
TCP/IP (Transmission Control Protocol/Internet Protocol) ::This account is very useful in the sense that the members can have unlimited access. For membership of this account, UNIX operating system is needed which is loaded with TCP/IP software. In this account graphs, figures, games, movies are available.
PPP (Point to Point Protocol) ::
It is a dial account which puts your computer directly on the internet. The computer will have its own host name and IP address. A modem is required for such connection which transmit the data 9600 bits per second.
It is a dial account which puts your computer directly on the internet. The computer will have its own host name and IP address. A modem is required for such connection which transmit the data 9600 bits per second.
WWW (World Wide Web) ::
It described as Wide Area Hypermedia Information initiative which aims to provide universal access to a large universe of documents. Mosaic programs is used to search the web. The operations of the web makes use of hypertext. It provides an integrated view of the internet used by clients and servers.
It described as Wide Area Hypermedia Information initiative which aims to provide universal access to a large universe of documents. Mosaic programs is used to search the web. The operations of the web makes use of hypertext. It provides an integrated view of the internet used by clients and servers.
CNEB ::
It is one of the services communicated via the Internet. It is a collection of inter connected documents and other resources, linked by hyperlinks and URLs.
It is one of the services communicated via the Internet. It is a collection of inter connected documents and other resources, linked by hyperlinks and URLs.
Gopher ::
All the available resources on the internet are shown by the Gopher in the form of menus. The concept of Gopher is based on the clients and servers.
All the available resources on the internet are shown by the Gopher in the form of menus. The concept of Gopher is based on the clients and servers.
WAIS ::
It is known as Wide Area Information Server. It maintains separate index for the contents of some selected documents. By pressing the name, WAIS provides a list of documents available in that index with similar keywords.
It is known as Wide Area Information Server. It maintains separate index for the contents of some selected documents. By pressing the name, WAIS provides a list of documents available in that index with similar keywords.
Mosaic ::
It is a program to cruise the internet. It can eliminate the needs of separate internet programs. It make the Internet available for everyone.
It is a program to cruise the internet. It can eliminate the needs of separate internet programs. It make the Internet available for everyone.
Archie ::
It is a program which helps in looking for an information on the internet. It searches its database and informs about the files. It can be termed as global librarian which automatically reaches to whole of the internet services.
It is a program which helps in looking for an information on the internet. It searches its database and informs about the files. It can be termed as global librarian which automatically reaches to whole of the internet services.
Hypertext ::
It is like a simple or regular text which can be written, edited and modified. Hypermedia is an advanced version of hypertext. It contains several links to text, sounds, images etc.
It is like a simple or regular text which can be written, edited and modified. Hypermedia is an advanced version of hypertext. It contains several links to text, sounds, images etc.
Web Addresses (URLSs) ::
URL stands for Uniform Resource Locator. A web address start with the name of a protocol, which is called a HTTP (Hypertext Transfer Protocol). HTTP means that the resource in question will be found on a web server.
URL stands for Uniform Resource Locator. A web address start with the name of a protocol, which is called a HTTP (Hypertext Transfer Protocol). HTTP means that the resource in question will be found on a web server.
Networking ::
Network is wade of communication with computers. A network means a small group of ten-twelve personal computer or it may also 64000 different types of networks linked over INTERNET. The network of computers classify into LAN, MAN and WAN.
Network is wade of communication with computers. A network means a small group of ten-twelve personal computer or it may also 64000 different types of networks linked over INTERNET. The network of computers classify into LAN, MAN and WAN.
Firewall ::
A firewall is a system or group of systems that enforces an access control policy between two networks.
A firewall is a system or group of systems that enforces an access control policy between two networks.
Local Area Network (LAN)
It is a system in which computers are inter-connected and the geographical spread may be within a building to 1 kilometre. A number of terminals can be used in the whole building at various places with sharing means. All the terminals are connected to a main computer called server.
It is a system in which computers are inter-connected and the geographical spread may be within a building to 1 kilometre. A number of terminals can be used in the whole building at various places with sharing means. All the terminals are connected to a main computer called server.
Types of LAN
Star LAN ::
A number of stations are connected to control station. The station passes information to the central station and then proceed it to the destination station. If one node of the network fails, it does not affect the connectivity.
A number of stations are connected to control station. The station passes information to the central station and then proceed it to the destination station. If one node of the network fails, it does not affect the connectivity.
Ring LAN ::
Stations are connected by cables using point-to-point link. Network access is not under control of central station. Each station can pass data to its adjacent node. Data travels through each node so failure in a single node cause failure of network.
Stations are connected by cables using point-to-point link. Network access is not under control of central station. Each station can pass data to its adjacent node. Data travels through each node so failure in a single node cause failure of network.
Bus LAN ::
There is no repeater. Stations are common and single communication line. Data is sent in packets and related station picked up by it. Any fault diagnosis is difficult.
There is no repeater. Stations are common and single communication line. Data is sent in packets and related station picked up by it. Any fault diagnosis is difficult.
Wide Area Network (WAN)
Network spread across countries. The network that brought the world on single platform. Usually use mainframe oriented systems. Use transmission channels such as co-axial cable or microwave.
Network spread across countries. The network that brought the world on single platform. Usually use mainframe oriented systems. Use transmission channels such as co-axial cable or microwave.
Types of WAN
Public Networks ::
These networks are owned and run by Telecommunication Authorities. These are made available to an individual subscriber or an organisation, ie, PSTN, PSDN, VAN, ISDN.
These networks are owned and run by Telecommunication Authorities. These are made available to an individual subscriber or an organisation, ie, PSTN, PSDN, VAN, ISDN.
Public Switched Telephone Networks (PSTN) ::
It is designed for telephone, which requires modem for data communication. It is used for FAX machine also. Its features—low speed transmission, analog transmission, less bond width, easy access, cover almost every place.
It is designed for telephone, which requires modem for data communication. It is used for FAX machine also. Its features—low speed transmission, analog transmission, less bond width, easy access, cover almost every place.
Public Service Digital Network (PSDN) ::
It is popular mode for connecting public and private mail system to have electronic mail services with other firms. Its features—high reliable, high quality communication, cost effective usage.
It is popular mode for connecting public and private mail system to have electronic mail services with other firms. Its features—high reliable, high quality communication, cost effective usage.
Value Added Network (VAN) ::
It provides Electronic Data Interchange (EDI) facility. The owner rent out the network to subscribers. Exchange of information like invoices, sale-purchase order, etc, is done.
It provides Electronic Data Interchange (EDI) facility. The owner rent out the network to subscribers. Exchange of information like invoices, sale-purchase order, etc, is done.
Integrated Services Digital Network (ISDN) ::
It is used for voice, video and data services. It uses digital transmission. It combines both circuit and packet switching.
It is used for voice, video and data services. It uses digital transmission. It combines both circuit and packet switching.
Private Network ::
It provides services at various locations using private or leased circuits by using technology of its choice. It is mostly used to carry large volume of data at very high speed transmission. It uses Modem’s multiplexes and other communication devices.
It provides services at various locations using private or leased circuits by using technology of its choice. It is mostly used to carry large volume of data at very high speed transmission. It uses Modem’s multiplexes and other communication devices.
Metropolitan Area Network (MAN) ::
This type of network is spread over a city. Its main purpose is to share hardware and software resources by the various users. Its example is cable TV network
This type of network is spread over a city. Its main purpose is to share hardware and software resources by the various users. Its example is cable TV network
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