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⟩ What are the differences between an Ethernet switch and a hub?

In a hub, a frame is passed along or "broadcast" to every

one of its ports. It doesn't matter that the frame is only

destined for one port. The hub has no way of distinguishing

which port a frame should be sent to. Passing it along to

every port ensures that it will reach its intended

destination. This places a lot of traffic on the network

and can lead to poor network response times.

Additionally, a 10/100Mbps hub must share its bandwidth

with each and every one of its ports. So when only one PC

is broadcasting, it will have access to the maximum

available bandwidth. If, however, multiple PCs are

broadcasting, then that bandwidth will need to be divided

between all of those systems, which will degrade

performance.

A switch, on the other hand, keeps a record of the MAC

addresses of all the devices connected to it. With this

information, a switch can identify which system is sitting

on which port. So when a frame is received, it knows

exactly which port to send it to, which significantly

increases network response times. And, unlike a Hub, a

10/100Mbps switch will allocate a full 10/100Mbps to each

of its ports. So regardless of the number of PCs

transmitting, users will always have access to the maximum

amount of bandwidth. It's for these reasons

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