我将随意将它们分为四类：故障、不受服务提供者直接控制的网络问题、拒绝服务和预订的维护。

I'll arbitrarily divide them into four areas: failures, network issues not within the direct control of service provider, denial of service, and scheduled maintenance.

youdao

针对各种各样的攻击实施威胁保护是必须的，比如拒绝服务攻击(DoS)和XML威胁。

Threat protection against a bewildering variety of attacks may be required such as denial of service (DoS) and XML threats.

youdao

您将看到各种云提供商使用的验证模型，并将讨论在隐私性、法规遵从性方面出现的问题和针对拒绝服务威胁提供的保护。

You will see the authentication models used by various cloud providers, and examine the challenges which arise from privacy, regulatory compliance, and protection from Denial-of-Service threats.

youdao