From the OSI architecture, the hub belongs to the first layer of physical layer devices of OSI, and the switch belongs to the second layer of data link layer devices in OSI. This means that the hub acts simultaneously, amplify, and plastic, and the short frame, fragmentation, etc. in the data transfer cannot be effectively processed, and the integrity of data transmission cannot be guaranteed; the switch can not only The transmission of data is synchronized, amplified, and plastic, and short frames, fragments, and the like can be filtered.
From a way of work, the hub is a broadcast mode, which means that all other ports are listened to information when a port of the hub is working, which is easy to generate a broadcast storm. When the network is large, the network performance will be greatly affected, and what method uses to avoid this happening? The switch can play this role. When switching the phase works, only the requesting ports and destination ports do not affect other ports, such that the switch can isolate the conflict domain and effectively suppress the production of broadcast storms.
From the bandwidth, all ports share a bandwidth regardless of how many ports, all ports can only have two port transfer data, and other ports can only be waiting; the hub can only work in half-duplex mode. For the switch, each port has an exclusive bandwidth. When two ports do not affect the work of other ports, the switch can not only work in the half-duplex mode, but also work in full-duplex mode. .
