Network Software

Posted by Unknown Tuesday, July 23, 2013 0 comments
Software controls the operations of computer networks. The software that manages the resources of the network is often called the network operating system. Services in LANS rely on network operating systems, such as Novell Netware, IBM OS/2 Warp Server, or Microsoft Windows NT Server. A server network operating system must meet stringent set of requirements than a client operating system such as Windows 98 or Mac Operating system. A variety of communication software packages are available for microcomputers, especially for Internet Web browsing, like Microsoft Explorer, Netscape Navigator, Microsoft Outlook etc. Several functions are commonly provided by communication software packages, examples are: access control, transmission control, network management, error control, security management etc.

Access control: it is responsible for establishing the connection between terminals and computers in a network. Access control activities include connecting links through modems, establishing communication parameters such as speed, mode and direction, automatic telephone dialing and redialing, logging on and off with appropriate account numbers.

Transmission control: This function allows computer and terminals to send and receive commands, messages, data and programs. Data and programs are usually transmitted in the form of files and thus this activity is also called file transfer.

Error control: Error control function involves detection and correction of errors. Communication software and processors detect errors in transmission by different methods, including parity checking and cyclic redundancy checks (CRC). Most error correction methods involve retransmission, in which a signal is sent back to the computer to retransmit the previous message which has been received with error.

Network management function: This function manages communication in a computer network. It also monitors network activity and the use of network resources by end users. Security management is required to protect a computer network from unauthorized access. Network operating systems, or other security programs, restrict access to the data files and other computing resources in networks. Data transmissions can also be protected encryption and authentication technique.

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