组播和广播
问题描述：
大家好，
1）定义多播和广播？
2）我可以在哪里使用多播和广播？
3）差异在多播和广播之间？
请任何人帮助我........... ...
问候，
Ranjith
Hi All,
1)Define Multicast and Broadcast?
2)where can i use multicast and broadcast?
3)difference between multi-cast and broad-cast?
Pls any one can help me..............
Regards,
Ranjith
答
BroadCast：仅使用1个发射帧将数据发送到同一网络上的任何其他网络适配器（使用相同的网络掩码）。
MultiCast：将数据发送到网络适配器的子集只使用1个发射帧的网络。
BroadCast使用192.168.1.255之类的地址向192.168.1.0到192.168.1.254的任何地址广播消息是255.255.255.0。
MultiCast使用 224 .1.2.3之类的地址向附加到该组地址 224 的所有适配器发送消息。 1.2.3。要从多播接收数据，客户端必须将自己注册到地址组（ 224 .1.2.3，即使其IP地址为192.168.1.1）
组播需要具有IGMP（Internet组管理协议）兼容交换机才能将数据路由到正确的客户端，没有IGMP它将充当广播并将数据发送到其所有端口。
具有良好网络基础设施的多播可以减少数据流量，因为数据需要发送到很多客户端而不是每个地方。
使用谷歌或任何其他工具进行简单的研究，我相信你会发现很多关于多播的信息。
BroadCast: send data to any other network adapters on the same network (using the same network mask) using only 1 emitted frame.
MultiCast: send data to a subset of network adapters on a network using only 1 emitted frame.
BroadCast used address like 192.168.1.255 to broadcast a message to any address from 192.168.1.0 to 192.168.1.254 where the network mask is 255.255.255.0.
MultiCast used address like 224.1.2.3 to send a message to all adapter attached to this group address 224.1.2.3. To receive data from a multicast, the client must register itself to the address group (224.1.2.3 even if its IP address is 192.168.1.1)
Multicast need to have IGMP (Internet Group Management Protocol) compatible switch to route data only to the correct clients, without IGMP it will act as broadcast and send the data to all its ports.
Multicast with good network infrastructure can reduce data trafic when data need to be sent to a lot a client but not every where.
Make a simple research with google or any other tool, and I''m sure you will find a lot of information on multicast.