Network topology

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    12-Jul-2015

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<ul><li><p>NETWORK TOPOLOGIESWHAT IS A TOPOLOGY?The pattern of interconnection of nodes in a network is called the topology.FACTORS TO CONSIDER WHILE MAKING A TOPOLOGY CHOICE CostFlexibilityReliability</p></li><li><p>First Page :Point to Point linkA point-to-point link basically relies upon two functions transmit and receive.MAIN CHARACTERISTIC-each station receives exactly from one transmitter and each transmitter transmits to exactly one receiver.</p><p>YXTRANSMITTRANSMITRECIEVERECIEVEPoint to Point Network</p></li><li><p>Types of Network TopologiesSTAR TOPOLOGYBUS TOPOLOGYRING TOPOLOGYTREE TOPOLOGYGRAPH TOPOLOGYMESH TOPOLOGY</p></li><li><p>The Star TopologyConsists of a central node to which all the other nodes are connected by a single path.Used in most existing information networks involving data processing or voice communications.</p></li><li><p>The Bus TopologyHas a single length of transmission medium onto which the various nodes are attached.Data is transmitted in small blocks, known as packets, each of has some data bits, plus a header containing its destination address.A destination device in the bus, identifies the address on the packets and copies the data onto the disk. </p></li><li><p>The Ring TopologyEach node is connected to two and only two neighboring nodes. Data is accepted from one of the neighboring node and is transmitted onwards to another.After passing through each node, data returns to the sending node, which removes it. </p></li><li><p>The Tree TopologyA variation of the bus topology Shape of this type of a network is that of a tree with the central root branching and sub-branching to the extremities of the network.No need of removing the packets from the medium because when a signal reaches the end of the medium, it is aborted by the terminators.</p></li><li><p>The Graph TopologyThe nodes are connected together in an arbitrary fashion.A link may or may not connect two or more nodes and can even have multiple linksIf a path has been established in one or two nodes via link(s), then it is known as a connected graph. </p></li><li><p>A GRAPH TOPOLOGYThe Graph Topology</p></li><li><p>The Mesh TopologyEach node is connected to more than one node to provide an alternative route in case the host is either down or too busy. Excellent for long distance networking.Used in large internetworking environments with stars, rings and buses attached to each node.</p></li><li><p>********</p></li></ul>