Points to Remember: Computer Network

Points to Remember:

• A computer network is an interconnection of various computers

• ARPANET was established by the Advanced Research Projects Agency (ARPA) in 1969

• World Wide Web was created by Timothy Berners Lee in 1989 at CERN in Geneva.

• Web page is a document available on World Wide Web

• Web Browser is an application software that allows us to view and explore information on the web

• Web server is a computer where the web content is stored. Basically web server is used to host the web sites

• Internet is a world-wide global system of interconnected computer networks.

• Network Topology is the schematic description of a network arrangement, connecting various nodes (sender and receiver) through lines of connection.

• A personal area network, or PAN, is a computer network that enables communication between computer devices

• A Local Area Network is a privately owned computer network covering a small Networks geographical area, like a home, office, or groups of buildings e.g. a school Network

• MANs are usually owned by large organizations to interconnect its various branches across a city.

• Computers connected to a Wide Area Networks are often connected through public networks

• A fibre-optic cable is made of glass or plastic and transmits signals in the form of light.

• The term wireless refers to the communication or transmission of information over a distance without requiring wires, cables or any other electrical conductors.

• Bluetooth is used to connect different electronic devices wirelessly to a system for transferring and sharing data.

• Infrared technology is a type of wireless communication technology to transfer data between two infrared enabled devices through infrared radiation.

• A WiFi setup consists of a wireless router which serves a communication hub, linking portable device with an internet connection.

• Hub is a common connection point for devices in a network.

• A switch is a hardware device that filters and forwards network packets.

• Repeaters remove the unwanted noise in an incoming signal.

• Gateways serve as the entry and exit point of a network.

• A domain name is a unique name that identifies a website.

• MAC stands for "Media Access Control" Address.

• IP stands for "Internet Protocol." An IP address, is a unique address that identifies a device on the Internet or a local network.

• Wireless communications is a type of data communication that is performed and delivered wirelessly.

• The Global System for Mobile Communications (GSM) is a second generation (2G) standard for mobile networks.

• CDMA (Code-Division Multiple Access) refers to a protocol used in second- generation  (2G)  and  third-generation  (3G)  wireless  communications.

• General Packet Radio Service (GPRS) is a packet-switching communications protocol for cellular networks.

• WLL is a system that connects subscribers to the local telephone station wirelessly.

• A Voice mail system can be thought as a message box for phone user to store voice messages and retrieve it through telephone.

• A video conference is a live, visual connection between two or more people residing in separate locations for the purpose of communication.

• Cyber law is the part of the overall legal system that deals with the Internet, cyberspace, and their respective legal issues.

• A firewall is a network security system, either hardware- or software-based, that uses rules to control incoming and outgoing network traffic.

• Cookies are small files which are stored on a user's computer.

• A cracker is someone who breaks into someone else's computer system