Explanation
Tamper detection is a physical security feature that can alert the technician when someone opens the server rack door without authorization. Tamper detection sensors can be installed inside the equipment or on the rack itself, and they can send an alert via email, SMS, or other methods. Tamper detection can help prevent unauthorized access, theft, or damage to the network assets.
References:
Physical Security - N10-008 CompTIA Network+ : 4.51

There are 7 severity logging levels: Emergency, Alert, Critical, Error, Warning, Notice, Informational, Debug (0-7).
The question states the log is only configured to report "CRITICAL" events, and the events that occurred are level 5 i.e (NOTICE) events.

Explanation
Cat 7 is a type of twisted-pair copper cable that supports up to 40 Gbps bandwidth and up to 100 meters cable length. Cat 7 is suitable for long cable runs that require high-speed data transmission. Cat 7 has better shielding and crosstalk prevention than lower categories of cables.
References: Network+ Study Guide Objective 1.5: Compare and contrast network cabling types, features and their purposes.

CSMA/CA used for communication coordination between wireless accesses points and multiple client devices.