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所在平台: Udemy |
课程主页: https://www.udemy.com/course/multicast-fundamentals-and-routing-zero-to-hero-y/
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课程名称：多播基础与路由 讲师：Arash Deljoo 课程概述： 本课程介绍计算机网络中的多播技术，即将数据同时传输到一组目标计算机的群体通信方式。多播可以实现一对多或多对多的分发。需注意，多播不同于物理层的点对多点通信。群体通信可以分为应用层多播和网络辅助多播，后者可以让源端高效地通过一次传输发送数据到目标组。网络中的其他元素如路由器、交换机和基站会自动生成数据副本，但仅限于网络段中当前有组成员的部分。网络辅助多播也可以在互联网层通过IP多播实现，路由器会为发送到多播目标地址的数据报生成最佳分发路径。 多播常用于流媒体的互联网协议(IP)应用中，例如IPTV和多点视频会议。多个互联网络的路由器能使用路由协议协同工作，交换目的地址的信息，每个路由器会建立路由表，列出连接两个计算机系统的路由。IP多播是一种在IP网络上进行一对多通信的技术，目标节点会根据需要发送互联网组管理协议的加入和离开信息。例如，当用户在IPTV中切换频道时，就会发生这种情况。IP多播能够为更大规模的接收方群体提供服务，而无需事先了解接收方的数量和身份。 多播高效利用网络基础设施，源端只需发送一次数据包，即便是需要发送给大量接收者，网络中的节点会在必要时负责复制数据包，以覆盖多个接收端。
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution.[Multicast should not be confused with physical layer point-to-multipoint communication.Group communication may either be application layer multicast or network-assisted multicast, where the latter makes it possible for the source to efficiently send to the group in a single transmission. Copies are automatically created in other network elements, such as routers, switches and cellular network base stations, but only to network segments that currently contain members of the group. Network-assisted multicast may also be implemented at the Internet layer using IP multicast. In IP multicast the implementation of the multicast concept occurs at the IP routing level, where routers create optimal distribution paths for datagrams sent to a multicast destination address.Multicast is often employed in Internet Protocol (IP) applications of streaming media, such as IPTV and multipoint videoconferencing.When multiple routers are used in interconnected networks, the routers can exchange information about destination addresses using a routing protocol. Each router builds up a routing table, a list of routes, between two computer systems on the interconnected networks.IP multicast is a technique for one-to-many communication over an IP network. The destination nodes send Internet Group Management Protocol join and leave messages, for example in the case of IPTV when the user changes from one TV channel to another. IP multicast scales to a larger receiver population by not requiring prior knowledge of who or how many receivers there are. Multicast uses network infrastructure efficiently by requiring the source to send a packet only once, even if it needs to be delivered to a large number of receivers. The nodes in the network take care of replicating the packet to reach multiple receivers only when necessary.
