Which log type records when a device was upgraded?
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Correct answer: Audit.
Why this is the answer
Audit logs track configuration changes, user logins, and system events, including device upgrades. This makes them essential for security, compliance, and troubleshooting. ACL logs record access control list hits or misses, not system upgrades. Email logs relate to email server activity. SNMP logs monitor network devices for operational data, but typically don't detail specific upgrade events in the same way an audit log would.
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