NETWORK MODELSA Network model describes how the computer processes information on the network. Data can be processed by a Client, a central Server or by all the computers on the network. 1). Centralized computer model.Very large computers, usually mainframes, are connected with terminals. The users input & output data using the terminals, while the processing is done by the central computer (mainframe). Advantages of Centralized model
Disadvantages of Centralized model
2). Distributive computingIn this model, data is stored and processed on the local workstation. Computers acting as Stand alone systems are connected together for increased functionality.A Stand alone is a computer which is not connected to any other computer equipment other than its own Printer. Advantages of Distributive Computing model.
Disadvantages of Distributive Computing model.
3). Collaborative model.In this model, all computers can share processing power across the network. Applications can be written to use the processing on the computers to complete job more quickly. Advantages of Collaborative model.
Disadvantages of Collaborative model.
CATEGORIES OF NETWORKS1. Peer-to-Peer network.A Peer is a computer that acts both as the client and a server.In this network, all the connected computers are equal & each machine acts as both client and Server. This means that, there is no central storage area for information & no dedicated central Server. No system administrator. Therefore, the user of each computer determines what data & resources the computer will shares with other computers on the network. Peer-to-peer networks are appropriate in an environment where:
Advantages of Peer-to-peer networks.
Disadvantages of Peer-to-peer networks.
2. Server-based networks.In this network, there is usually a Server, e.g. a company which is dedicated to handle files and/or information for clients, make & service requests from network clients, and ensure security of files and directories for them. Server-based networks require a network operating system. Advantages of Server based networks.
Disadvantages of Server based networks.
Review questions.2. How does each of the following networking models operate?
Network SecurityIn networking, there are several ways of protecting your data and information from intruders. They include: Share level and User level security. Share level securityThis model of security is mostly used in peer-to-peer networks. The user can decide which resources to give for sharing. Most Windows operating systems such as Windows 9X provide such kind of security. User-level securityThe User level security is used on server-based networks. A network administrator assigns accounts to users, i.e., each user is provided with a unique name and a password which he/she can use to access network resources.
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March 2024
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