组播是一种有效支持多点通信的机制。
Multicast is a mechanism to efficiently support multi-point communications.
首先，UDP支持组播-发送一个数据包到多台机器。
Firstly, UDP supports multicast - sending a single packet to multiple machines.
阐述了MPLS组播的必要性及应用合并组播树的概念。
The conception of MPLS multicast and needing are introduced in this paper.
多点到多点组播路由是组播研究领域内的一个重要问题。
Many-to-many multicast routing is an important problem in multicast research fields.
介绍了基于组播的安全协同多会话交谈系统的设计与实现。
This paper introduces the design and implementation of group secure cooperative multi-session system based on multicast.
以多服务组播为研究背景，研究组播的层次接入控制技术。
Hierarchical access control of multicast was studied against the background of multi-services multicast.
提出了一种基于组播频道跳变的安全特定源组播通信方案。
This paper proposes a secure source specific multicast scheme based on multicast channel hopping.
提出了在组播应用中满足多个约束条件的一种组播路由算法。
The article presents a multicast routing algorithm that meets three constraint conditions in the multicast application.
本文主要探讨在以太网交换机上的一种组播协议：组播侦听协议。
In this paper, the multicast protocol (IGMP Snooping) on Ethernet switch is discussed.
协议无关组播-稀疏模式是目前应用最广泛的组播路由协议之一。
Protocol-independent multicast sparse mode(PIM-SM) is one of the most widely used multicast routing protocols.
组播服务器复制是一种改善组播服务性能、提高可扩展性的新技术。
Multicast server replication is a novel technique for multicast to enhance the performance and scalability.
组播安全问题包括：数据保密、组管理和访问控制、源认证等多个方面。
The issue of multicast security consists of data confidentiality, group management, data source authentication and so on.
作为有效解决方法的IP组播因为缺乏广泛的支持而逐渐被应用层组播代替。
As an efficient solution, IP multicast is being increasingly replaced by application-level multicast on account of the lack of widespread support.
组播有着很广阔的应用前景，越来越多的组播应用对组播提出了安全性要求。
The multicast applications are going to be widely adopted, and more and more applications need multicast provide them with secure solutions.
组播算法就是要建立一棵从源节点到目的节点的组播树，并给这棵组播树分配波长。
Multicast algorithm is to build a multicast tree from the source node to destination nodes, and to assign wavelength.
该文在分析组播通信安全需求的基础上，提出一种基于密钥矩阵的组播密钥管理方案。
According to the analysis of the security demand of multicast communication, a multicast key management scheme based on key matrix is proposed.
组播树特征伸长度模型通过寻找路径伸长度密集分布区域来评价组播路径的优化程度。
By looking for the areas where stretch values are dense, the stretch eigen-value model judges optimization degree of multicast paths.
该文分析了一种解决组播状态问题的方法——聚集组播和聚集组播的组-树匹配算法。
A method of resolving the scalability problem — aggregated multicast and the group-tree matching algorithm are analyzed.
组播通信有效地节约了网络资源，在无线移动网络环境中引入组播有着非常重要的意义。
Multicast conserves the network resources efficiently, it is significant to provide multicast mechanism in wireless mobile environment.
组播技术包括了组播组、组播地址、组播协议、组播可靠性和组播安全性等很多方面的内容。
Multicast technology includes a number of aspects, such as multicast group, multicast address, multicast protocols, multicast reliability, multicast security, etc.
组播技术的核心是选路问题，设计或选取合适的组播路由算法对组播选路的有效实施非常重要。
The core of multicast mechanism is routing problem, and designing & selecting appropriate multicast routing algorithm is very important to efficiently implement multicast routing.
传统的组播密钥管理都假设所有合法组用户可以知道组密钥，这种假设对于商业组播是不现实的。
It is impractical for commercial multicast assuming that all group members know the group key in traditional multicast key management schemes.
IP组播利用树转发结构，只需在组播树的分支处复制数据报文，而且在每条链路上仅转发一次。
IP multicast utilizes a tree delivery structure, on which data packets are duplicated only at fork nodes and are forwarded only once over each link.
随着网络中组播业务比例的不断增长，交换结构及其调度策略必须能够为组播业务提供良好的支持。
Since multicast traffic exhibits an increasing proportion of traffic on the Internet, switch architecture and scheduling policy must afford good support for multicast traffic.
相比于传统MRA算法，该算法生成的组播树中源点到组播成员节点的平均延时大约为前者的90%。
The average delay from the source to all destinations in the tree generated by the algorithm is about 90% of the traditional MRA algorithm.
相比于传统MRA算法，该算法生成的组播树中源点到组播成员节点的平均延时大约为前者的90%。
The average delay from the source to all destinations in the tree generated by the algorithm is about 90% of the traditional MRA algorithm.
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