2. 计算机
  3. Robert has been given the responsibility of installing doors that provide different types of protection. He has been told to ins

Robert has been given the responsibility of installing doors that provide different types of protection. He has been told to ins

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问题 Robert has been given the responsibility of installing doors that provide different types of protection. He has been told to install doors that provide failsafe, fail-secure, and fail-soft protection. Which of the following statements is true about secure door types?
选项 A、Fail-soft defaults to the sensitivity of the area.
B、Fail-safe defaults to locked.
C、Fail-secure defaults to unlocked.
D、Fail-secure defaults to double locked.
答案A
解析 A正确。带自动锁的门可以配置成故障保护(fail-secure)型、故障安全型(fail-safe)或故障弱化型(fail-soft)。故障弱化指的是根据某个区域内的数据和系统(比如某人在这幢大楼的特定区域内工作)的敏感度，默认设置为上锁或解锁。故障弱化系统的目的是以故障的方式尽可能多地保护数据和功能。
B不正确。因为故障安全(fail-safe)并非默认为上锁。故障安全设置是指一旦发生了影响自动上锁系统的电力中断，那么门默认为解锁。故障安全的设置直接与对人的保护有关。如果人们在一个区域内工作，一旦该区域发生大火或者断电，把人锁在里面可不是个好主意。
C不正确。因为故障保护(fail-secure)并非默认为解锁。故障保护配置是指一旦电力出现问题，门默认为上锁。注意不要混淆故障保护和故障安全。你可以这么想：如果故障保护锁出现故障，门是安全的，即门被锁住；如果故障安全锁出故障，那么它所保护的人是安全的，因为人们可以通过门离开。
D不正确。因为故障保护并非默认为双重上锁。在故障保护配置下，如果电力出现问题，门便会锁上。
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