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by Dinesh Thakur Category: Computer Network

Availability of different operating systems, hardware platforms and the geographical dispersion of the computing resources necessitated the need of networking in such a manner that computers of all sizes can communicate with each other, regardless of the vendor, the operating system, the hardware platform, or geographical proximity. Therefore, we may say that internetworking is a scheme for interconnecting multiple networks of dissimilar technologies. To interconnect multiple networks of dissimilar technologies use both additional hardware and software. This additional hardware is positioned between networks and software on each attached computer. Thus, system of interconnected networks is called an inter network or an Internet.



 
by Dinesh Thakur Category: Computer Network

     Need For Computer Networks

The term network is defined as a set of computers of different types, terminals, telephones, and other communication equipments, connected by data communication links, which allow the network components to work together. The network components may be located within a small area or spread over many remote locations. In any case, data communications hold the network together.



 
by Dinesh Thakur Category: Computer Network

baud, baud rate A baud is the number of signaling elements per second sent by a communications device such as a modem, In theory, a modem with a high baud rate means fast transmission. The baud rate is therefore equal to the bit rate only if each signal element represents one bit of information.



 
by Dinesh Thakur Category: Computer Network

Broadcast: Any form of communication in which a single sender transmits messages to many receivers at once, the most familiar examples being the television and public radio systems. The opposite of broadcast is POINT-TO-POINT or narrowcast communication, between just a single transmitter and a single receiver - a telephone conversation for example. When such a multiple connection is made via a network cable as opposed to wireless, such communication is often called MULTIPOINT, as opposed to a point-to-point or UNICAST.

 
by Dinesh Thakur Category: Computer Network

The acronym bps stands for bits per second, which is a measurement of how fast information (data) travels between two devices. When two modems converse via the telephone line, the speed of modem communications is measured in bps. (When people talk about modems, they often use the word "baud" to mean the same thing as bps, though technically the two terms are not synonymous.



 
by Dinesh Thakur Category: Computer Network

A null modem cable is a cable that plugs into the communication port (the serial port, the one where you would plug in the cable for a modem) of two computers that are pretty close to each other. Then the two computers can share information back and forth, even faster than if they were connected by a modem and phone lines. If you want to be able to connect your portable computer directly to your bigger computer without modems, you need to hook them together with a null modem cable. Or you can use a standard serial cable and get a null modem adaptor, which is just a plug with a female jack on one side and a male jack on the other.



 
by Dinesh Thakur Category: Computer Network

Application Server: A network SERVER that enables users to run application programs such as word processors or spreadsheets on the server itself, rather than downloading the application's code and running it on their local workstation. Application servers are often used in conjunction with diskless workstations or so called THIN CLIENTS.

 
by Dinesh Thakur Category: Computer Network

Distributed computing is a quick but kind of stuffy way to describe the situation when a business relies on lots of small computers located throughout the organization, rather than a few big machines at some central location. They may still have a few big machines, but many important duties are assigned to the personal computers and workstations, too. All the computers are tied together in a network, communicating with each other so that different portions of an application run on different computers.



 
by Dinesh Thakur Category: Computer Network

If you don't quite know what a fax is, first read the definition on the previous page. And if you're shaky on what a modem is, it might be smart to read that definition too. Anyway, a fax modem is simply a modem designed for sending and (usually) receiving faxes via your computer. Using a fax modem, you can send a document to someone else's fax machine without having to print out the document and then stand there and make sure the pages don't jam in the fax machine. In fact, if the other person has a fax modem attached to their computer, they can receive the document directly into their computer and read it on their screen. Of course, they can print it to their own printer and then have a copy on real paper instead of that disgusting fax paper.



 
by Dinesh Thakur Category: Computer Network

As in any other walk of life a protocol is just an agreed set of rules to be followed by all concerned. In this case all concerned means Modems which, by following recognized rules of procedure, can communicate with each other. At least, they can if they all follow the same set of rules. This being the software industry there is no such thing as a single standard. Instead many such protocols have been designed, each one just different enough so that there can be no communication between them.



 

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