Computer Networks
Computer Networks
NETWORKING CONCEPTS Network A network is basically an interconnection of various points to make a connected system e.g Road, Telephone, Social Data Network A computer network therefore refers to an interconnection of computers and other peripherals by use of a communication link Peer to Peer Networks In a peer-to-peer network, all computers are considered equal; they all have the same abilities to use the resources available on the network. Peer-to-peer networks are designed primarily for small to medium local area networks. Strength (Setup Cost is low, simple to manage) Weaknesses (Decentralized, Low security) Client/Server Networks Client/server network operating systems allow the network to centralize functions and applications in one or more dedicated servers. Advantages (Centralized, Scalability, Flexibility, Interoperability, Accessibility) Disadvantages (Cost, maintenance, Dependence one server) Server Types A sever in a network is dedicated to perform some specific task in support of other computers on the network. One server may perform all these tasks, or a separate server may be dedicated to each task. Common server types 1. File server 2. Print server 3. Application server 4. Message server 5. Database server File Server It offers services that allow network users to share files with network .File servers , users can exchange, read, write and manage shared files and the data contained in them. They are designed specifically to support the file services for a network. The file servers include: a) File transfer b) File storage c) File update synchronization d) File archiving File Transfer Network offers file transfer services by typically transferring files between clients and servers. This calls for file security. Every network operating systems has its own level of file security. Higher level use passwords to control system access, File attributes to limit file usage and encryption schemes to prevent data from being obtained by
NETWORKING CONCEPTS Network A network is basically an interconnection of various points to make a connected system e.g Road, Telephone, Social Data Network A computer network therefore refers to an interconnection of computers and other peripherals by use of a communication link Peer to Peer Networks In a peer-to-peer network, all computers are considered equal; they all have the same abilities to use the resources available on the network. Peer-to-peer networks are designed primarily for small to medium local area networks. Strength (Setup Cost is low, simple to manage) Weaknesses (Decentralized, Low security) Client/Server Networks Client/server network operating systems allow the network to centralize functions and applications in one or more dedicated servers. Advantages (Centralized, Scalability, Flexibility, Interoperability, Accessibility) Disadvantages (Cost, maintenance, Dependence one server) Server Types A sever in a network is dedicated to perform some specific task in support of other computers on the network. One server may perform all these tasks, or a separate server may be dedicated to each task. Common server types 1. File server 2. Print server 3. Application server 4. Message server 5. Database server File Server It offers services that allow network users to share files with network .File servers , users can exchange, read, write and manage shared files and the data contained in them. They are designed specifically to support the file services for a network. The file servers include: a) File transfer b) File storage c) File update synchronization d) File archiving File Transfer Network offers file transfer services by typically transferring files between clients and servers. This calls for file security. Every network operating systems has its own level of file security. Higher level use passwords to control system access, File attributes to limit file usage and encryption schemes to prevent data from being obtained by