How it works
Networks are judged on whether information stays available, stays unaltered, and stays limited to the people entitled to it. A failure in any one of those has consequences beyond the technical fault.
Describe an outage in terms of what people can no longer do, then work back to the mechanism. That ordering is what makes an answer about impact rather than about equipment.
Common error
Availability is not the only thing that matters. Data that is reachable but wrong, or reachable by the wrong people, is its own kind of failure.
Worked example
Translate a network incident into user impact before recommending resilience.
Evidence
Clinic scheduling service: unavailable for 45 minutes
Patient records: no observed disclosure
Record contents: no observed alterationThe supplied evidence primarily concerns availability: staff cannot schedule appointments. It does not establish a confidentiality or integrity breach. Describe delayed service and recovery needs, then investigate the outage mechanism and a proportionate continuity measure.
Exercises
4.1.1
A shared folder is online, but an unauthorized user changes appointment times. Which security goal is most directly affected?
Show solution
Integrity is directly affected because the information was changed without authorization. Availability alone would not capture the problem; access controls and audit records are relevant.
4.1.2
Name two operational consequences of losing a school network during online registration.
Show solution
Families may be unable to submit registrations and staff may be unable to verify submissions or allocate places. Connect recovery priorities to those disrupted tasks rather than merely naming failed equipment.