What is Network topologies? Topology means physical and logical layout of network.A topology is defined as the arrangement of nodes,cables,connectivity that make up network.

Topologies are divided into 2 parts.

**Physical topology **

It describes the actual layout of transmission media.

**Logical topology**

It describe logical pathway in which nodes are connected.

**Type :**

1) Star topology

2)Bus topology

3)Mesh topology

4) Ring topology

5)Hybrid topology

**(1) Star topology **

In the **Star Topology** each nodes are connected to single hub.this hub is central node.

**Advantages of this topology :**

- If N devices are connected to each other in star topology, then the number of cables required to connect them is N. So, it is easy to set up.
- Each device require only 1 port i.e. to connect to the hub.

**Problems with this topology :**

- If the concentrator (hub) on which the whole topology relies fails, the whole system will crash down.
- Cost of installation is high.
- Performance is based on the single concentrator i.e. hub.

(**2)Bus Topology**

In the **Bus Topology** all nodes are connected to single a single cable.In this topology data is transmited in single direction only,no Bi-Direction allowed.

To know more about each topology you can download PDF file.

For more details you can learn deeply from this link

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