While the GUI is unresponsive, which action should be taken on a Citrix ADC MPX appliance to restart and capture a core dump for analysis?

While the GUI is unresponsive, which action should be taken on a Citrix ADC MPX appliance to restart and capture a core dump for analysis?

• A. Turn off the appliance using the power button.
• B. Use the reset button on the front of the appliance.
• C. Use the NMI button on the back of the appliance.
• D. Connect to a USB port to issue a restart command.

Answer: (C)

When a Citrix ADC MPX appliance becomes unresponsive, the action to take is to press the NMI button on the back of the unit. This triggers a non-maskable interrupt, which forces the system to generate a crash dump (core dump) and then restart. That core dump provides the diagnostic data analysts need to investigate the hang or crash. Using the NMI is specifically for capturing a crash state without risking the kind of data you’d lose with an abrupt power-off. The front reset button typically reboots the device but doesn’t guarantee a diagnostic dump. The power button would simply power off the device, and using USB to issue a restart isn’t the standard method for obtaining a crash dump. Hence, the back-panel NMI button is the correct, purposeful choice for this scenario.

When a Citrix ADC MPX appliance becomes unresponsive, the action to take is to press the NMI button on the back of the unit. This triggers a non-maskable interrupt, which forces the system to generate a crash dump (core dump) and then restart. That core dump provides the diagnostic data analysts need to investigate the hang or crash.

Using the NMI is specifically for capturing a crash state without risking the kind of data you’d lose with an abrupt power-off. The front reset button typically reboots the device but doesn’t guarantee a diagnostic dump. The power button would simply power off the device, and using USB to issue a restart isn’t the standard method for obtaining a crash dump. Hence, the back-panel NMI button is the correct, purposeful choice for this scenario.