Star Topology | Working of Star Topology | Pros and Cons of Star Topology

 

Introduction of Topology

Physical or Logical layout of structure called topology, in which all nodes are connected. Network topology is the arrangement of the elements of a communication network. The physical topology of LAN refers to the way in which the stations are physically interconnected. Each topology has its own strengths and weakness.

Feature of network topology: 1. The topology should be flexible. You can increase or decrease number of nodes in topology. 2. The cost of physical media and installation should be minimum. 3. The network should not have any single point of complete failures.

Types of Topologies

There are 5 types of topologies in computer network:

Star Topology

A star topology consists of a number of devices connected by point-to-point links to a central hub. Easy to control and traffic flow is simple. Data travels from the sender to central hub and then to the receiver. A dedicated link is provided to host and centralize hub. Centralized device may be hub or switch.

Figure: Star Topology Structure

In a star topology, the central hub acts like a server and the connecting nodes act like clients. When the central node receives a packet from a connecting node, it can pass the packet on to other nodes in the network. A star topology is also known as a star network.

Figure: Star Topology Animation

Advantages

It is easy to modify and new nodes to a star network without disturbing the rest of the network.

Troubleshooting techniques are easy.

Failures of any node do not bring down the whole star network.

Disadvantages

If the central hub fails, the whole network fails to operate.

Each device requires its own cable segment.

Installation can be moderately difficult, especially in the hierarchical network.

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