-NETWORK-
| NETWORK BASIC |
NETWORK ARCHITECTURE |
NETWORK TOPOLOGY |
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3.1 NETWORK TOPOLOGY
DEFINITION OF NETWORK TOPOLOGY:
| TYPES OF NETWORK TOPOLOGY |
BUS TOPOLOGY
 |
|
RING TOPOLOGY
 |
|
STAR TOPOLOGY |
|
| DESCRIPTION |
|
| BUS TOPOLOGY |
A bus network consists of a single ( backbone ) ,to which all computers and other devices connect. |
| RING TOPOLOGY |
A cable forms a closed loop (ring ) wiyh all computes and devices arranged along the ring. |
| STAR TOPOLOGY |
All computers and other devices and other devices on the network connect to a central device (hub\switch ),thus forming a star. |
ADVANTAGES |
|
| BUS TOPOLOGY |
-It is easy to set-up and extend bus network. - Cable length required for this topology is the least compared to other networks - Bus topology costs very less. -Linear Bus network is mostly used in small networks. Good for LAN. |
| RING TOPOLOGY | -All computers have equal access to the resources in the network -The uses of token passing enable all devices in aring topology to share the network resources fairly -Cable faults are easily located ,making troubleshoot easier |
| STAR TOPOLOGY |
-If one device fails,only that device is affected. -Devices can be added to or removed from network with little or no disruption -Easy to troubleshoot and isolate problem. |
| DISADVANTAGES |
|
| BUS TOPOLOGY |
1) There is a limit on central cable length and number of nodes that can be connected. 2) Dependency on central cable in this topology has its disadvantages.If the main cable (i.e. bus ) encounters some problem, whole network breaks down. 3) Proper termination is required to dump signals. Use of terminators is must. 4) It is difficult to detect and troubleshoot fault at individual station. 5) Maintenance costs can get higher with time. 6) Efficiency of Bus network reduces, as the number of devices connected to it increases. 7) It is not suitable for networks with heavy traffic. 8) Security is very low because all the computers receive the sent signal from the source. |
| RING TOPOLOGY |
1) Each packet of data must pass through all the computers between source and destination. This makes it slower than Star topology. 2) If one workstation or port goes down, the entire network gets affected. 3) Network is highly dependent on the wire which connects different components. 4) MAU’s and network cards are expensive as compared to Ethernet cards and hubs. |
| STAR TOPOLOGY |
1) Too much dependency on central device has its own drawbacks. If it fails whole network goes down. 2) The use of hub, a router or a switch as central device increases the overall cost of the network. 3) Performance and as well number of nodes which can be added in such topology is depended on capacity of central device |
BY ANIS FAUZAH :)