Computer Network

Computer Tutorial

» Introduction to Networking » Elementary Terminology of Networks » History (Development) of Computer Networks » Advantages of Computer Networks » Disadvantages of Computer Networks » Applications & Uses of Networks » ARPANET » Internet

Data Communication Data Communication Component Data Transmission Modes Types of Connections Analog Transmission Digital Transmission

Transmission Media Twisted Pair Cable Coaxial Cable Optical Fiber Wireless Communication Radio waves Microwave Infrared

Types of Computer Networks Personal Area Network Local area networks Metropolitan Area Network Wide Area Network Type of Network on the term purpose

Computer Network topologies Bus Topology Ring Topology Star Topology Mesh Topology Tree Topology Hybrid Topology

Networking Devices Hubs Switches Bridges Routers Gateways Wireless Access Point Modems Media Converters Firewalls

Wireless or Mobile Computing Evolution of mobile communication systems Second Generation Networks Third Generation Networks Fourth & Fifth Generation Networks Wireless Transmission Protocols Multiple Access Techniques Frequency Division Multiple Access Time Division Multiple Access Code Division Multiple Access Space Division Multiple Access

Computer Network Model Layered Tasks The OSI Model Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer TCP/IP Reference Model

Medium Access Methods ALOHA Slotted ALOHA CSMA CSMA / CD Collision-Free Protocols

Error Detection and Correction Types of errors Error Detecting Codes Simple Parity check Two-dimension Parity Check Checksum Cyclic redundancy check Error Correcting Codes

Network Security Network Security Threats Network Security Threats Prevention Why Three Encryption Techniques? Firewall

Computer Networ MCQ

Applications & Uses of Networks

In the short time they have been around, data communication networks have become an indispensable part of business, industry, and entertainment. Some of the network applications in different fields are the following:

Marketing and sales

Computer networks are used extensively in both marketing and sales organizations. Marketing professionals use them to collect, exchange, and analyze data relating to customer needs and product development cycles. Sales applications include teleshopping, which uses order entry computers or telephones connected to an order-processing network, and on-line reservation services for hotels, airlines, and so on.

Financial Services

Today's financial services are totally dependent on computer networks. Applications include credit history searches, foreign exchange and investment services, and electronic funds transfer (EFT), which allows a user, to transfer money without going into a bank (an automated teller machine is a kind of electronic funds transfer; automatic paycheck deposit is another).

Manufacturing

Computer networks are used today in, many aspects of manufacturing, including the manufacturing process itself. Two applications that use networks to provide essential services are computer-assisted design (CAD) and computer-assisted manufacturing (CAM), both of which allow multiple users to work on a project simultaneously.

Electronic Messaging

Probably the most widely used network application is electronic mail (e-mail).

Directory Services

Directory services allow lists of files to be stored in a central location to speed worldwide search operations.

Information services

Network information services include bulletin boards and data banks. A World Wide Web site offering the technical specifications for a new product is an information service.

Electronic data interchange (EDI)

EDI allows business information (including documents such as purchase orders and invoices) to be transferred without using paper.

Teleconferencing

Teleconferencing allows conferences to occur without the participants being in the same place. Applications include simple text conferencing (where participants communicate through their keyboards and computer monitors). voice conferencing (where participants at a number of locations communicate simultaneously over the phone) and video conferencing (where participants can see as well as talk to one another).

Cellular Telephone

In the past two parties wishing to use the services of the telephone company had to be linked by a fixed physical connection. Today's cellular networks make it possible to maintain wireless phone connections even while traveling over large distances.

Cable Television

Future services provided by cable television networks may include video on request, as well as the same information, financial, and communications services currently provided by the telephone companies and computer networks.

Computer Network

Applications & Uses of Networks