Minggu, 17 November 2013

Network Topology
What is a network topology? In communication networks, a topology is a usually schematic description of the arrangement of a network, including its nodes and connecting lines. There are two ways of defining network geometry: the physical topology and the logical (or signal) topology.
The physical topology of a network is the actual geometric layout of workstations. There are several common physical topologies, as described below and as shown in the illustration.
1) Bus Topology
     In the bus network topology, every woekstation is connected to a main cable called the bus. Therefore, in effect, each workstation is directly connected to every other workstation in the network.

2) Star Network
     In the star network topology, there is a central computer or server to which all the workstations are directly connected. Every workstation is indirectly connected to every other through the central computer.

3) Ring Network
    In the ring network topology, the workstations are connected in a closed loop configuration. Adjacent pairs of workstations are directly connected. Other pairs of workstations are indirectly connected, the data passing through one or more intermediate nodes.

4) Token Ring Network
     If a token ring protocol is used in a star or ring topology, the signal travels in only one direction, carried by a so-called token from node to node.

5) Mesh Network
    The mesh network topology employs either of two schemes, called full mesh and partial mesh. In the full mesh topology, each workstation is connected directly to each of the others. In the partial mesh topology, some workstations are connected to all the others, and some are connected only to those other nodes with which they exchange the most data.

6) Tree Network
     The tree network topology uses two or more star networks connected together. The central computers of the star networks are connected to a main bus. Thus, a tree network is a bus network of star networks.

(source: http://whatis.techtarget.com/definition/network-topology)

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