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Network Architecture

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Jelilat Abu

on 7 May 2013

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Transcript of Network Architecture

Network
Architecture Network Architecture Topologies Types of Networks How it works Bus Network Advantages/Disadvantages Network Architecture describes how a network is
arranged and how resources are coordinated and shared. It includes a variety of different network specifics, including network topologies and strategies. A network can be arranged or configured in several ways. the arrangement is called network's topology. The most common are: A bus network topology is a network architecture in which a set of clients are connected via a shared communications line/cables, called a bus.
•A bus is a subsystem that transfers data between components inside a computer, or between computers. •Bus networks are the simplest ways to connect multiple clients.
•There may be problems when two clients try to transmit at the same time on the same bus.
•Bus networks are considered passive.
•The computers on the bus simply listen to a signal but are not actually responsible for moving the signal along.
•In this type of network clients are referred to as stations or workstations.
•Bus network topology uses a broadcast channel which means that all of the stations attached can hear every transmission and all stations have equal priority when using the network to transmit data. Advantages Star Network Each device is connected directly to a central network. Tree Network Each device is connected to a central node, either directly or through on or more other devices. Mesh Network This topology is the newest type and does not use a specific physical layout such as a star or tree. The mesh network requires that each node have more then one connection to the other nodes. If the path between two nodes is somehow disrupted, data can be automatically rerouted around the failure using another path. Star Network Tree Network Mesh Network •Installation is easier.
•It is both simple and cheap.
•If one computer happens to fail it does not affect the other computers.
•Printers can also be shared. Disadvantages • If the main cable fails then all other sources will die.
• Connection limitation can occur.
• A fault within the shared communication line stops all transmissions in the network.
• The longer the distance covered by a signal along the shared communication line the greater the heat transformed from energy which can weaken the signal. • Very orderly network where every device has access to the token and the opportunity to transmit
• Performs better than a bus topology under heavy network load
• Does not require a central node to manage the connectivity between the computers Disadvantages • One malfunctioning workstation can create problems for the entire network. This can be solved by using a dual ring or a switch that closes off the break.
• Moving, adding and changing the devices can affect the network
• Communication delay is directly proportional to number of nodes in the network Advantages Ring Network A ring network is a network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring. Data travels from node to node, with each node along the way handling every packet.
Because a ring topology provides only one pathway between any two nodes, ring networks may be disrupted by the failure of a single link. A node failure or cable break might isolate every node attached to the ring. Star Network Star networks are one of the most common computer network topologies. In its simplest form a star network consists of one central switch, hub or computer which acts as a conduit to transmit messages. Advantages 1) Better performance star topology prevents the passing of data packets through an excessive number of nodes.
2)Installation and configuration is easy since everyone device only requires a link and one input/output port to connect it to any other devices.
3)Easy to detect faults and to remove parts.
4) No disruptions to the network Disadvantages 1)Expensive to install
2)Extra hardware required
3)High dependence of the system on the functioning of the central hub. Failure of the central hub renders the network inoperable.
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