How does a switch differ from a hub?

How does a switch differ from a hub?
A . A switch does not induce any latency into the frame transfer time.
B . A switch tracks MAC addresses of directly-connected devices.
C . A switch operates at a lower, more efficient layer of the OSI model.
D . A switch decreases the number of broadcast domains.
E . A switch decreases the number of collision domains.

View Answer

Answer: B

Explanation:

Some of the features and functions of a switch include:

A switch is essentially a fast, multi-port bridge, which can contain dozens of ports. Rather than creating two collision domains, each port creates its own collision domain. In a network of twenty nodes, twenty collision domains exist if each node is plugged into its own switch port. If an uplink port is included, one switch creates twenty-one single-node collision domains. A switch dynamically builds and maintains a Content-Addressable Memory (CAM) table, holding all of the necessary MAC information for each port. For a detailed description of how switches operate, and their key differences to hubs, see the reference link below. http://www.cisco.com/warp/public/473/lan-switch-cisco.shtml