What are differences between the multicast and unicast transmission modes for S series switches

Differences between the multicast and unicast transmission modes
- In unicast transmission mode, a source sends an independent data packet to each host that requires data. In this mode, the amount of data transmitted on a network is proportional to the number of users who require the data. If a large number of users require the same data, the source must send many copies of the data to these users, consuming high bandwidth on the source and network.
- Multicast is a point-to-multipoint (P2MP) data transmission mode. The source sends only one copy of data, and all the hosts that require the data can receive the same data. Other hosts on the network cannot receive the data. In multicast mode, data starts to be copied and distributed on the network node as far from the source as possible. Therefore, the amount of data and network resource consumption will not increase greatly when the number of receivers increases.

Disadvantages of multicast transmission
- Compared with the unicast mode, the multicast mode has no error correction mechanism, but some fault tolerance mechanisms can be adopted.
- Although multicast transmission is supported by existing networks, features such as customer authentication and QoS are not well supported.

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