Contents
1. ... LAN Network Topologies 6
Bus 6
Token Ring 7
Star 8
5. ... NETWORK OPERATING SYSTEM (NOS) 11
8. ... Printers can be very expensive especially if they are colour printers, it would be more cost effective to share this resource this can be achieved by interconnecting all the devices requiring access to the shared resource via a network.
The network provides an intelligent switching capability between the devices that need to print, or if a large print buffer was required this device became a print server. ... Local Area Networks
A loacl area network (LAN) is a network which covers alimited area and which generally provides a high data rate capability. ... LAN Network Topologies
In discussing networks the first thing to consider are the topologies that are used there are four main types: -
Bus
To be more specific, Bus is one of a family of network architectures ruled by a protocol called Carrier Sense Multiple Access/Collision Detect (CSMA/CD).
In a CSMA/CD network all the stations are connected to a common bus. ...
Token Ring
A Ring based network means that each station in the network is connected to its two neighbours by point-to-point links. ... Access to the network is based on the following rule: As long as all the stations are idle, a special bit pattern called a token circulates around the ring. ... In the star network, all interactions between different computers in the network travel through the host computer. ... As such, the star network is appropriate for systems that demand centralized control. ... The disadvantage of the star network is that a processing problem in the central computer can be paralysing to the entire system.
In a star network, the central unit may be a host computer or a file server. ... It stores data and programs files shared by the users on the network. Also, called a network server. ...
The disadvantage of this topology is that if there is a break in the transmission media the network is effectively divided or partitioned. ...
For the purpose of the Companies LAN Topology, a Star Network has been chosen, because of it¡¦s ruggedness and the ease of which additional workstations / printers etc. can be added to the network. ... NETWORK OPERATING SYSTEM (NOS)
This is installed on a server in a local area network and coordinates the activities of the network providing services to the computers and other devices attached to the network. Unlike a single-user operating system, a network operating system must acknowledge and respond to requests from many workstations, managing such details as network access and communications, resource allocation and sharing, data protection, and error control. The NOS is thus crucial in determining the overall effectiveness of the system as well as the transparency of the network in terms of access to the communications, file and print services offered by the network server.
NOS should provide the following: -
„h Provide access to files via the file server on a multi-tasking basis
„h Provide a user shell which , in conjunction with the host operating system, will redirect network file request. ...
„h Incorporate differing levels of security and /or access control
„h Provide network accounting facilities
„h Permit inter-networking via internal and/or external bridges. ... Hardware
File server
On a local area network (LAN), this is a computer running administrative software that controls access to the network and its resources, such as printers and disk drives, and provides resources to computers functioning as workstations on the
For the purposes of the Company a single file server with a RAID level 1 fault tolerance incorporating disk duplexing has been chosen.
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