Chapter 9. Communications and Networks
Today computer is available in many offices and homes and therefore there is a need to share data and programs among various computers with the advancement of data communication facilities. The communication between computers has increased and it thus it has extended the power of computer beyond the computer room. Now a user sitting at one place can communicate computers of any remote sites through communication channel. The aim of this chapter is to introduce you the various aspects of computer network.
We all are acquainted with some sorts of communication in our day to day life. For communication of information and messages we use telephone and postal communication systems. Similarly data and information from one computer system can be transmitted to other systems across geographical areas. Internet is not a governmental organisation. The ultimate authority of the Internet is the Internet Society. This is a voluntary membership organisation whose purpose is to promote global information exchange. Internet has more than one million computers attached to it. Local Area Network Networks used to interconnect computers in a single room, rooms within a building or buildings on one site are called Local Area Network (LAN). LAN transmits data with a speed of several megabits per second (106 bits per second). The transmission medium is normally coaxial cables.
LAN links computers, i.e., software and hardware, in the same area for the purpose of sharing information. Usually LAN links computers within a limited geographical area because they must be connected by a cable, which is quite expensive. People working in LAN get more capabilities in data processing, work processing and other information exchange compared to stand-alone computers. Because of this information exchange most of the business and government organisations are using LAN.
CAREERS IN IT : Network administrator - manage a company's LAN and WAN
networks. They may be responsible for design, implementation, and maintenance
of networks. Responsibilities usually include maintenance of both hardware and
software related to a company's intranet and Internet networks. Network
administrators can expect to earn an annual salary of $48,500 to $79,000.
Opportunities for advancement typically include upper management positions.
A LOOK TO THE FUTURE : Telepresence lets you be there without
actually being there...
How would you like to speak with distant
friends or family as though they were in the same room at touch of a button?
Can you imagine receiving a physical examination from a doctor thousand miles
away? All this and more could be possible in the future thanks to the emerging
technology known as telepresence.
The network technologies that handle our cellular, business, and Internet
communications come in many different forms.
Imagine a world where you can send your thoughts and ideas directly to another
person’s mind, without typing or talking.
We all are acquainted with some sorts of communication in our day to day life. For communication of information and messages we use telephone and postal communication systems. Similarly data and information from one computer system can be transmitted to other systems across geographical areas. Internet is not a governmental organisation. The ultimate authority of the Internet is the Internet Society. This is a voluntary membership organisation whose purpose is to promote global information exchange. Internet has more than one million computers attached to it. Local Area Network Networks used to interconnect computers in a single room, rooms within a building or buildings on one site are called Local Area Network (LAN). LAN transmits data with a speed of several megabits per second (106 bits per second). The transmission medium is normally coaxial cables.
LAN links computers, i.e., software and hardware, in the same area for the purpose of sharing information. Usually LAN links computers within a limited geographical area because they must be connected by a cable, which is quite expensive. People working in LAN get more capabilities in data processing, work processing and other information exchange compared to stand-alone computers. Because of this information exchange most of the business and government organisations are using LAN.
CAREERS IN IT : Network administrator - manage a company's LAN and WAN
networks. They may be responsible for design, implementation, and maintenance
of networks. Responsibilities usually include maintenance of both hardware and
software related to a company's intranet and Internet networks. Network
administrators can expect to earn an annual salary of $48,500 to $79,000.
Opportunities for advancement typically include upper management positions.
A LOOK TO THE FUTURE : Telepresence lets you be there without
actually being there...
How would you like to speak with distant
friends or family as though they were in the same room at touch of a button?
Can you imagine receiving a physical examination from a doctor thousand miles
away? All this and more could be possible in the future thanks to the emerging
technology known as telepresence.
The network technologies that handle our cellular, business, and Internet
communications come in many different forms.
Imagine a world where you can send your thoughts and ideas directly to another
person’s mind, without typing or talking.