What is mean by HUB Define it?

Answer 1

A HUB is typically the least expensive, least intelligent, and least complicated of the three. Its job is very simple: anything that comes in one port is sent out to the others. That's it. Every computer connected to the hub "sees" everything that every other computer on the hub sees. The hub itself is blissfully ignorant of the data being transmitted. For years, simple hubs have been quick and easy ways to connect computers in small networks.

Answer 2

A hub is a wiring concentrator. It allows devices to connect together so that the connected devices can send data packets to each other. A hub only allows two devices to communicate at a time, because every data packet is delivered to every connected device. Every device must sort through every packet to find it's own packets among them, and no device can transmit if another is receiving. This is okay for an installation with one computer and a few peripherals.

A switch is a lot like a hub, but more sophisticated. It is a better solution if several computers are connected in a larger network, because the switch is able to guide data packets directly to the target device, hiding them from the other devices. This reduces congestion and allows all devices to communicate simultaneously, improving network performance.

Some hubs and switches offer managementfeatures, enabling them to filter data packets or alter how they are delivered. Large businesses and network centers prefer these for security and flexibility.