在讨论广播和多播之前，先看看简单的基于UDP的服务器框架(清单6)。
Before delving into the topics of broadcast and multicast, however, look at a simple UDP-based server framework (see Listing 6).
可在同一端口上创建多个客户端，它们可加入多播组来接收来自服务器的数据报。
Multiple clients can also be created on the same port and joined to the multicast group to receive the datagrams sent from the server.
因此，在多播客户端翻转到单播连接时，会为网络和服务器增加更大的负载。
Therefore, when multicast clients roll over to a unicast connection, more stress is added to the network and to the server.
多播地址对一个隧道服务器无效。
客户可以在LANE服务器上注册目的MAC地址单播和多播。
Clients can register destination unicast and multicast MAC addresses with the LANE server.
多播地址对一个隧道服务器无效。
多播也能减少网络服务器上的负荷。
Multicast can also reduce the load placed on network servers.
多播也能减少网络服务器上的负荷。
多播也能减少网络服务器上的负荷。
There is not enough available memory to load the network server.
在原型系统方面，研究并实现了一个新的基于代理服务器的覆盖多播系统—服务可定制的覆盖多播系统(SCOMS)。
In prototype, a new proxy-based overlay multicast system called Service Customizable overlay multicast system (SCOMS) is studied and implemented.
网络克隆服务器运行要稳定：由于网络克隆是数据多播，对服务器的要求要高，同时处理并发请求功能要好。
Cloning network server operations to stability: Cloning is multicast data networks, the demand for high-server, concurrent request processing function better.
网络克隆服务器运行要稳定：由于网络克隆是数据多播，对服务器的要求要高，同时处理并发请求功能要好。
Cloning network server operations to stability: Cloning is multicast data networks, the demand for high-server, concurrent request processing function better.
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