In the center of the diagram in Figure 2 is Tivoli's WebSEAL product, which serves the role of a proxy and provides a security mechanism to control access to documents and Web objects in the network.
图2的中心展示的是Tivoli的WebSEAL产品，该产品充当代理的角色并提供安全机制来控制对网络中的文档以及Web对象的访问。
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。
Such issues constitute a control challenge because tried and tested network-level security controls might not work in a given cloud environment.
这些问题构成了一个控制的挑战，因为基于尝试和测试的网络级安全控制在一个给定的云环境中可能无法正常工作。
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