F5 BIG-IP LTM Specialist: Maintain and Troubleshoot — Question 127

In preparation for a maintenance task, an LTM Specialist performs a "Force to Standby" on LTM device Unit 1. LTM device Unit 2 becomes active as expected.
The maintenance task requires the reboot of Unit 1. Shortly after the reboot is complete, the LTM Specialist discovers that Unit 1 has become active and Unit 2 has returned to standby.
What would cause this behavior?

Answer options

• A. Unit 1 is set with the redundancy state preference of active in devices groups.
• B. Unit 1 is set with the redundancy state preference of active in high availability.
• C. A traffic group is configured with Auto Failback, and Unit 1 is the default device.
• D. A device group is configured with Auto Failback, and Unit 1 is the default device.

Correct answer: C

Explanation

The correct answer is C because the behavior described is caused by the traffic group being configured with Auto Failback, which allows Unit 1 to automatically return to active status after a reboot since it is the default device. Options A and B refer to redundancy preferences that do not directly explain the automatic failback behavior, while option D incorrectly states that a device group rather than a traffic group is responsible for the failback process.