What is Internet? – The Internet has gained popularity and emerged as an important and efficient means of commuication. The idea of introducing the Internet was to allow millions of people to share information and ideas, sounds, video clips using their computers across the world.
The Internet is a world wide network of networked computers those are able to exchange information with each other. It consist of thousands of separately administered network of various sizes and types.
What is Internet?
Internet Stands for International Network, which began in 1950’s by Vint Cerf known as the Father of Internet. Internet is a ‘network of networks‘ that consists millions of private and public networks local to global scope. Basically network group of two or more computer systems linked togethar.
The Data move around the Internet is controlled by protocols. Under TCP/IP Protocol (Transmission Control Protocol/ Internet Protocol), a file is broken into smaller parts by the file server called packets. All computers on the Internet, communicate with one another using TCP/IP, which is a basic protocol of the Internet.
History Of Internet?
In 1969, the University of california at Los Angeles, the University of Utah were connected as the beginning of the ARPANET (Advanced Research Projects Agnecy Network) using 50 kbits circuits. It was the world first operational packet switching network. The goal of this project was to connect computers at different universities and US Defence.
In mid 80’s another federal agency, the National Science Foundation, Created a new High capacity network called NSFnet, which was more capable than ARPANET. The only drawback of NSFnet was that it allowed only the academic research on its network and not any kind of private business on it. So, private organizations and people started working to build their own networks, which were later interconnected with ARPANET and NSFnet to form the Internet.
What is Internet?
Advantage Of Internet:-
- Allows you to easily communicate with other people
- Global reach enables one to connect anyone on the Internet.
- Publishing documents on the Internet saves paper.
- A Valuable resource for companies to advertise and conduct business.
- Greater access to information reduces research times.
Disadvantages Of Internet:-
- It is a major source of computer viruses.
- Messages sent across the Internet can be easily intercepted and are open to abuse by others.
- Much of the information is not checked and may be incorrect or irrelevant.
- Unsuitable and undesirable material available that sometimes are used by notorious people such as terrorists.
- Cyber frauds may take place involving Credit/Debit card numbers and details.
Bandwidth and cost are the two factors that help you in deciding which Internet Connections is to use. The speed of Internet access depends on the bandwidth.
Some of Internet connections available for Internet Access are as follows:
A Dial-Up is method of connecting to the Internet using an existing telephone. Dial-Up connection uses the telephone line to connect to the Internet. The Modem connects the computer through the standard phone lines, which serve as the data transfer medium. When a user initiates a dial-up connection. the modem dials up phone number of an Internet Service Provider (ISP) that is designed to recieve dial-up calls. The ISP then establishes the connection, which usually takes about ten seconds and accompanied by several beeping and buzzing sounds.
The term broadband commonly refers to high speed internet access that is always on and faster than the traditional dial-up access. It uses a telephone-line to connect to the Internet.
Broadband access allows users to connect to the Internet at greater speed than a standard 256 KB modem or dial-up access. Broadband includes several high speed transmission technologies such as follows
- Digital Subscriber Line (DSL) DSL is a popular broadband connections. It provides Internet access by transmitting digital data over the wires of a local telephone networks. DSL is the most common type of broadband service. it uses the existing copper telephone lines. A special modem is neccessary in order to be able to use a DSL service over a standard phone line.
- Cable Modem This service enables cable operators to provide broadband using the same co-axial cables that deliver pictures and sound to your TV set. Most cable modems are external devices that have two connections, one to the cable wall outlet and other to a computer. They provide transmission speed of 1.5Mbps or More
- Fibre Optic This technology converts electric signals carrying data to light and sends the light through transparent glass fibers of about the diameter of a human hair. Fibre transmits data at speed far exceeding typically by tens or even hundreads of Mbps.
- Broadband Over Power Line (BPL) BPL is the delivery of broadband over the existing low and medium voltage electric power distribution network. BPS speeds are comparable to DSL and Cable modem speeds. BPL is good for areas, where there are no other broadband connections, but power infrastructure exists, eg. rural areas.
Wireless broadband connects a home or business to the Internet using a radio link between the customer’s location and the service provider’s facility. Wireless broadband can be mobile or fixed. Unlike DSL and Cable, wireless broadband requires neither a modem not cables and as a result it can be easily established in areas, where it is not feasible to deploy DSL or cable, Some ways to connect the Internets Wirelessly are as follows:
- Wireless Fidelity (Wi-Fi) It is a universal wireless networking technology that utilizes radio frequencies to transfer data. Wi-Fi allows high speed Internet Connections without the use of cables or wires. Wi-Fi networks can be use for such as restaurants, coffee shops, hotels, airports, convention centers and city parks.
- Worldwide Interoperability For Microwave Access (WiMAX) It is one of the hottest broadband wireless technologies around today. WiMAX systems are exepected to deliver broadband access services to residential and enterprize customers in an economical way. It is based on wireless MAX technology. WiMAX would operate silimar to Wi-Fi but at higher speed, over greater distances and for a greater number of users. WiMAX has the ability to provide service even in areas that are difficult for wired infrastructure to reach and the ability to overcome the physical limitations of traditional wired infrastructure.
- Mobile Wireless Broadband Services These services are also becoming available from mobile telephone service providers and others. These services are generally appropriate for mobile customers and require a special PC Card with a laptop computer. Generally, they provide lower speeds in the range of several hundred kbps.
- Satellite Satelite which orbiting the earth provide necessary links for telephone and television service. they can also provide links for broadband. Satellite broadband is another form of wireless broadband and is also useful for serving remote.
Intranet – Intranet is a private network for internet tools,but available within an organization. In Large organization Intranet allows an easy access to corporate information for employees.
Extranet – Extranet is a private network that uses the internet protocol and the public telecommunication system to security share part of a business information.
Integrated Services Digital Network – (ISDN) It is a digital telephone service that can transmit voice, data control and control information over an existing single telephone line. It was the first high speed alternative to regualr analysis phone modems.
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