O O Q

(c) Fully meshed

(c) Fully meshed

Fig. 11.18. Network topologies.

Fig. 11.18. Network topologies.

1. Manageable hub. The ports on the hub can be enabled or disabled by the network administrator through software.

2. Stand alone hub. It is used for work groups of computers that are separate from the rest of the network. They can not be linked together to represent a larger hub.

Fig. 11.19. Hybrid technology.

3. Modular hub. In this hub, the number of ports can be extended by adding extra cards.

4. Stackable hub. A stackable hub looks like a stand alone hub, but several of them can be stacked or connected together in order to increase the number of ports.

The advantage of this topology is that when one hub breaks only stations connected to the broken hub will be affected.

Hybrid technology. It is a combination of different topologies connected together by a backbone cable as shown in Fig. 11.19. Each network is connected to the back bone cable by a device called a bridge.

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