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  3. Which one of the following characteristics is true regarding the use of hubs and switches?

Which one of the following characteristics is true regarding the use of hubs and switches?

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问题 Which one of the following characteristics is true regarding the use of hubs and switches?
选项 A、Hubs can have their ports be configured with VLANs
B、Using hubs is costly with regard to bandwidth availability.
C、Switches can not forward broadcasts.
D、Switches are more efficient than hubs in processing frames.
E、Switches increase the number of collision domains in the network.
答案E
解析 Explanation: Switches increases the number of collisions domains in the network. Switches that are configured with VLANs will reduce the size of the collision domains by increasing the number of collision domains in a network, but making them smaller than that of one big, flat network.

Incorrect Answers:
A. Switches are capable of VLAN configurations, but hubs are not.

B. Hubs are generally the least costly method possible to connect multiple devices together in a network.

C. Switches forward broadcasts and multicasts, by default, to all ports within the same VLAN. Only routers block all broadcast traffic by default.

D. Switches and hubs can be equally efficient in processing frames, in theory. In practice, switches are generally more efficient as they usually have more CPU and memory allocated to them, and are generally much more expensive than a simple hub.
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