The paper mainly introduces the components and the related technology of network security access control system and explores the application of this technology on railway information system.

主要介绍网络安全准入控制系统组成及相关技术，并对该技术在铁路信息系统中如何应用加以探讨。

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It is essential to consider the possible access paths to every layer of a system, and also to consider how authorization integrates with other security aspects, such as network level protection.

务必考虑系统的每个层次的可能访问路径，同时还要考虑授权如何与其他安全功能(如网络级别的保护)集成。

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Security measures, including access to portions of the network, or control over quality of the service, are best addressed through policies.

可以通过策略实现安全措施(包括对部分网络的访问)或控制服务质量。

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As proof, Dusche pointed to the smart cards issued to Microsoft employees for network and security access.

CNN: Microsoft pushes smart cards

Issues to consider include ease of deployment, managing backup and data access, support, security, network complexity, device management, operating system diversity, total cost of ownership and integration of various tablet platforms at the application, mobile device management process and system level.

FORBES: Written by Mitch Cline

It is possible malicious hackers can intercept this data unless you set up a security such as a remote access virtual private network (VPN).

BBC: You could get online across London with the new plans.