网络层

Internet网络层安全协议理论研究与实现

Theoretic researches and implementation of IP securing protocol via internet network layer

移动IP是一种网络层的移动解决方案，它的安全与应用成为人们最为关注的问题。

Mobile IP is a mobile solution on the network layer .

传统的安全机制只能保证Web服务传输层和网络层的数据安全，不能保证Web服务消息级的端到端安全。

The traditional security mechanism only guarantees the Web service the transport layer and network layer data security .

网络层（networklayer）负责管理网络中的报文移动，具体来说就是确保报文都到达自己的目标（也称为路由）。

The network layer manages the movement of packets in a network , specifically making sure packets get to their destination ( also called routing ) .

使用UML设计和实现TETRA网络层协议

Design and implement network layer protocol in TETRA use UML

一个PDA电子邮件系统网络层协议的设计与实现

Designing and Realization of IP on PDA Email System

现有互联网采用了基于IP地址的网络层路由技术和基于域名解析的域名服务器（DNS）应用层路由技术。

Current Internet adopts IP-based network-layer routing and name resolution-based Domain Name System ( DNS ) application-layer routing .

将VoIP应用性能参数映射到网络层

Mapping VoIP Performance Parameters into Network Layer Metrics

移动IP是一种支持节点移动的网络层解决方案，它的应用与安全问题已经逐渐成为人们关注的热点。

Mobile IP is a network layer solution which can support node mobility . Nowadays its application and security problem is already became hot spot .

如何结合网络层、Mac层和物理层进行研究是一个非常有意义的话题，也是未来的一个研究方向。

How to combine Network layer , Mac layer and Physical layer to exploit spatial diversity is a future topic .

IP协议，不仅应用于互联网，而且正在迅速成为所有无线系统网络层的普遍协议。

IP ( Internet Protocol ) is not only applied to Internet , but also becoming the common protocol of the Network Layer of wireless system rapidly .

本文结合传统组通信机制中的一些概念和网络层的提供的多播功能，提出用基于IPmulticast的组通信机制，用于支持上述这些分布式应用系统的构建。

In this paper , we propose to combine group communication mechanism and network layer multicast ( IP Multicast ) to build these distributed applications .

PROFIBUS现场总线网络层采用屏蔽双绞线连接。

The shield twisted-pair was used to link with PROFIBUS field bus network layer .

因此，在第三章我们根据网络层显示拥塞指示技术支持，提出一种公平窗口算法，使该算法在IP网络中得以实现。

Therefore , a new fair window algorithm is proposed in the third part and is realized in IP network in support of ECN mechanism in network layer .

网络层中增加了一个负责有线IP分组和无线IP分组的接收及其相互转换的信关IP层；

In network layer , we add a new gateway IP layer into additional IP protocol layer to receive and interchange wired IP packet and wireless IP packet ;

网络层安全体系框架IPSec（IPsecurity）在报文信息安全模型基础上提供了基于密钥的报文源验证服务。

Existing network security framework IP Security ( IPSec ) proposed for information security model offers data origin authentication service based on common keys in IP layer .

应用层组播将组播功能从网络层上移至应用层，在不改变Internet体系结构的情况下，取得一种接近IP组播的带宽利用效率。

ALM will move multicast from the network layer to application layer . An IP Multicast close to the efficient use of bandwidth is made with not changing the Internet architecture .

根据P2P的技术特征，主要的研究与应用问题集中在所形成的覆盖网络层。

According to the technical features of P2P , problems of the research on P2P and application of it mainly concentrate on the Overlay network .

中间件是分布式系统上构筑三层C／S基础应用框架的一种构件技术，是处在操作系统、网络层和应用层之间的一组中间组件。

The middleware is a kind of component technology which constructs 3 layers of Client / Server foundation . It is a package of groupware located between operating system and Internet or application layer .

理论分析表明，与传统的移动IP协议及分级移动IP协议相比，该机制能降低移动主机的网络层切换时延，显著减少网络层切换引起的分组丢失；

The numerical analysis discloses that the proposed scheme can shorten more handover delay and reduce the packets loss ratio more efficiently than mobile IP protocol and hierarchical mobile IP protocol .

新的媒体QoS分类层采用一种对于应用层和网络层均透明的分类算法对MPEG-4AVO进行分类。

The new Media QoS classification layer uses an algorithm that is transparent to both the application layer and the network layer to classify the MPEG-4 AVOs .

IPSec作为一种实施于网络层（IP）的安全协议，具有抗攻击、保护数据完整性、保护数据机密性和完美向前保密的诸多特性。

Of the TCP / IP model , IPSec has the advantages such as anti-attack , identity authorization , data integrity and confidentiality and perfect forward security .

研究表明，将物理层、MAC层、网络层或应用层的信息结合在一起，进行跨层优化设计能够获得更高的能量有效性。

Researches indicate that cross-layer optimization design can improve energy-efficiency highly by integrating the information of the physical , MAC , network or the application layer .

这样一来，DM节点既是网络层组播的数据接收者，又是P2P应用层的数据发送者。

In this way , DM was not only the receiver in the network layer multicast , but also was the receiver in the P2P application layer .

由于采用了分层架构，本系统的用户P2P层与传统P2P流媒体点播系统对比，避免了P2P层与网络层不匹配的问题。

Because of the hybrid architecture , the proposed system can avoid mismatch between P2P application layer and network layer which is a big problem in traditional P2P systems .

该系统由三个层次构成：通信网络层、移动Agent平台以及基于语义Web的移动Agent服务，包括推理服务、查询服务、匹配服务、本体服务和语义扩展服务等。

This system is made of three layers , communication network , Mobile-Agent platform and Mobile-Agent service based on Semantic Web , include inference service , query service , matching service , ontology service and Semantic extend service .

它工作于服务器群的最前端，对所有的服务器都透明。相比于原来混杂在一起的Windows配置，它运行于一个独立的网络层，更易于维护与故障处理。

It also works in front of the boxes so it 's completely transparent to them , and easier to troubleshoot as a different networking layer instead of being intermixed with all your windows configuration .

为了提高整个消息中间件的性能，网络层采用JavaNIO技术，综合Reactor模式实现了消息的异步发送和接收。

In order to improve performance of system , In the Network Layer , we use Java NIO technology and Reactor pattern to realize the asynchronous sending and receiving of messages .

未来光互联网的网络层仍将以IP（网际协议）业务为主导，而传输层应用DWDM（密集波分复用）技术是必然趋势。

IP services will still dominate the network layer of future optical internet , while the use of DWDM technology will become a certain tendency in the transport layer .

文中以话音业务为例分析了网络层QoS风险参数与网络资源的关系，并进行了仿真研究，仿真结果证明了理论分析的正确性。

As an example , the relation between the network layer risk parameters and the network resource is studied for voice service , and the simulation shows the rationality of the theory analysis .