What is network topology define different topology?
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Network Topology
Definition - What does Network Topologymean?
Network topology refers to the physical or logical layout of a network. It defines the way different nodes are placed and interconnected with each other. Alternately, network topology may describe how the data is transferred between these nodes.
There are two types of network topologies: physical and logical. Physical topology emphasizes the physical layout of the connected devices and nodes, while the logical topology focuses on the pattern of data transfer between network nodes.
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Techopedia explains Network Topology
The physical and logical network topologies of a network do not necessarily have to be identical. However, both physical and network topologies can be categorized into five basic models:
Bus Topology: All the devices/nodes are connected sequentially to the same backbone or transmission line. This is a simple, low-cost topology, but its single point of failure presents a risk.
Star Topology: All the nodes in the network are connected to a central device like a hub or switch via cables. Failure of individual nodes or cables does not necessarily create downtime in the network but the failure of a central device can. This topology is the most preferred and popular model.
Ring Topology: All network devices are connected sequentially to a backbone as in bus topology except that the backbone ends at the starting node, forming a ring. Ring topology shares many of bus topology's disadvantages so its use is limited to networks that demand high throughput.
Tree Topology: A root node is connected to two or more sub-level nodes, which themselves are connected hierarchically to sub-level nodes. Physically, the tree topology is similar to bus and star topologies; the network backbone may have a bus topology, while the low-level nodes connect using star topology.
Mesh Topology: The topology in each node is directly connected to some or all the other nodes present in the network. This redundancy makes the network highly fault tolerant but the escalated costs may limit this topology to highly critical networks.
NETWORK TOPOLOGY
Network topology refers to the layout pattern in which various computer are connected to one another to form network.
THEY R CATEGORISED INTO 5 BASIC TYPES
« Bus Topology
« Ring Topology
« Star Topology
« Tree Topology
« Mesh Topology - Full Mesh Topology
- Partial Mesh Topology
DIFFERENT TYPES OF TOPOLOGY
Bus Topology - Bus topology uses single cable to connect all computer. Each computer is directly connected to other computer in the network. It can travel in both direction and can be received by other computer on the network. This network cannot function if there is a break in the bus.
Ring Topology - In ring topology each computer is connected to to two other computer in the form of a ring structure. All data travels in the same direction. Here each computer has equal access to resources.The major disadvantage of ring topology is the failure of any one computer on a ring can disable the entire network.
Star Topology - In start topology all the computers are connected to a central computer or central node. all the date on the start of policy passes through the centre computer before reaching the intended destination. Failure of one node of computer doesn't affect the rest of the network. The major disadvantages of the star topology is high dependence of the system on the functionary of central hub.
Tree Topology - Tree topology is identical to the bus topology except that branches with multiple nodes are possible.In tree topology the number of star networks are connected using bus.This main cable seems like a main stem of a tree and other star networks as the branches. Failure of the main cable will disable than entire network
Mesh Topology - Mesh topology is basically of two type Full Mesh Topology and Partial Mesh Topology. Full mesh topology are connected to every other computer, while partial mesh topology only a few computers are connected to all the computer. If one of the computer fails the rest of the network continue to operate normally. The main disadvantage of Mesh topology is the cost to implement is higher than any other network topology, making it is less desire option.