Internet is the worlds largest computer network, which consists of several computers of different types belonging to various networks all over the world. Internet can also be defined as a technology for linking local area networks (LAN) into a huge global computer network. So Internet is a network of networks.
A device that can use Wi-Fi (such as a personal computer, video game console, smartphone, tablet, or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Such an access point (or hotspot) has a range of about 20 meters (65 feet) indoors and a greater range outdoors. Hotspot coverage can comprise an area as small as a single room with walls that block radio waves or as large as many square miles — this is achieved by using multiple overlapping access points.
Applications of the internet
Internet is a large information pool. It is turning out to become the fastest media to reach huge mass. Internet is very popular among people because it provides various facilities in the following areas of application:- Message Communication
- Information gathering
- Business
- Education
- Employment
- Entertainment
- Publishing
- Data transfer
- Access
- Social impact
- Internet and Political revolutions.
Requirements for the internet are:
- Computer
- Browser software
- Communication Medium
- Service Provider
- Modem
What is a Search Engine ?
As web is the world's largest source of information, finding information is not always easy. That is why there are "Search Engines". Search Engine is an internet Accessible search service that enables us to search for any information on the internet using a browser. The commonly used search engines are Google (www.google.com) and Alta Vista (www.altavista.com).
What is a Network ?
A computer network, often simply referred to as a network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information.[1] Where at least one process in one device is able to send/receive data to/from at least one process residing in a remote device, then the two devices are said to be in a network.
Networks may be classified according to a wide variety of characteristics such as the medium used to transport the data, communications protocol used, scale, topology, and organizational scope.
Communications protocols define the rules and data formats for exchanging information in a computer network, and provide the basis for network programming. Well-known communications protocols are Ethernet, a hardware and Link Layer standard that is ubiquitous in local area networks, and theInternet Protocol Suite, which defines a set of protocols for internetworking, i.e. for data communication between multiple networks, as well as host-to-host data transfer, and application-specific data transmission formats.
Computer networking is sometimes considered a sub-discipline of electrical engineering, telecommunications, computer science, information technology orcomputer engineering, since it relies upon the theoretical and practical application of these disciplines.
The different Types of Network are:
- LAN- Local Area Network-A LAN connects network devices over a relatively short distance.
- WLAN-Wireless Local Area Network- a LAN based on wireless network technology.
- WAN-Wide Area Network.
- MAN-Metropolitan Area Network
- SAN-Storage Area Network, System Area Network, Server Area Network, or Small Area Network
- CAM-Campus Area Network, Controller Area Network, or Cluster Area Network
- PAN- Persona Area Network
- DAN- Desk Area Network
What is Ethernet ?
Ethernet is a family of computer networking technologies for local area networks (LANs) commercially introduced in 1980.Ethernet has largely replaced competing wired LAN technologies.Systems communicating over Ethernet divide a stream of data into individual packets called frames. Each frame contains source and destination addresses and error-checking data so that damaged data can be detected and re-transmitted.
The standards define several wiring and signaling variants. The original 10BASE5 Ethernet used coaxial cable as a shared medium. Later the coaxial cables were replaced by twisted pair and fiber optic links in conjunction with hubs or switches. Data rates were periodically increased from the original 10 megabits per second, to 100 gigabits per second.
Since its commercial release, Ethernet has retained a good degree of compatibility. Features such as the 48-bit MAC address and Ethernet frame format have influenced other networking protocols.
What is WIFI ?
Wi-Fi sometimes spelled Wifi or WiFi) is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections. The Wi-Fi Alliance defines Wi-Fi as any "wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards". However, since most modern WLANs are based on these standards, the term "Wi-Fi" is used in general English as a synonym for "WLAN".
A device that can use Wi-Fi (such as a personal computer, video game console, smartphone, tablet, or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Such an access point (or hotspot) has a range of about 20 meters (65 feet) indoors and a greater range outdoors. Hotspot coverage can comprise an area as small as a single room with walls that block radio waves or as large as many square miles — this is achieved by using multiple overlapping access points.
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