COMPARISION BETWEEN SWITCH AND HUB

Switch	Hub
As per the OSI model, network switches are classified as Data Link Layer devices, i.e. they operate at Layer 2. However, certain multi-layer switches can operate at higher layers as well.	As per the OSI model, a hub is a Physical Layer device, i.e. it operates at Layer 1.
A switch is a more sophisticated network device and is more expensive than a hub.	A hub is a very primitive device and is comparatively much cheaper.
A switch is an intelligent device, it transmits the data packets from the source computer to only those network computers to which the data packets are originally intended.	A hub is a 'dumb' device to say the least. It broadcasts the data packets to each and every networked computer, and not just the target computer or set of computers to which the data packets were originally intended to be sent.
There is optimum utilization of network bandwidth in case of switches, and bandwidth wastage is minimal.	Due to their broadcast mechanism of data transmission, there is unnecessary wastage of network bandwidth which results in slow operation and data transfer speeds.
Switches are full-duplex devices, i.e. both, data transmission and reception can take place simultaneously.	Hubs are half-duplex devices, i.e. both, data transmission and reception cannot take place simultaneously.
Network security is much better with the use of a switch, as compared to a hub.	Thanks to its broadcast mechanism, network security becomes a big issue and a loophole in the case of a hub.