ITPEC IP October 2019 Question 61
ITPEC IP October 2019 — Question 61 of 100
Making the e-mail service usable at all times except during defined maintenance hours is an availability requirement. Availability describes when users can access a service and is commonly measured as an agreed service period or percentage of uptime, with planned maintenance treated according to the agreement.
Answer (b)
Why not others:
- restricting access to a web browser specifies an interface or access method
- preventing unauthorized reading concerns confidentiality
- preventing falsification of sent messages concerns integrity and authenticity
Key rule: Availability means authorized users can access a service when required; confidentiality prevents disclosure and integrity prevents unauthorized alteration.
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