A data center technician is assigned the daily task of walking through the data center to perform a health check on all the systems. Which of the following issues can the technician detect without…

A VLAN mismatch is a logical network configuration issue that cannot be detected by a physical walk-through; it requires checking network device configurations.

Many UPS devices are equipped with status indicator lights or audible alarms that signal a battery fault, which can be observed or heard without needing to log into any system.

Overheating systems often produce noticeably loud fan noise, and heat can be felt emanating from server exhausts; additionally, some server chassis have external status LEDs that indicate thermal issues.

Memory exhaustion is an operating system or application-level issue that requires logging into the system or using monitoring tools to detect.

An IP conflict is a logical network issue that causes connectivity problems but is not physically observable from the outside of a system.

While a completely failed OS might result in a server showing no activity, the specific cause (OS failure) is not directly detectable without logging in or using out-of-band management for console access.