Exam F5CAB1 Topic 1 Question 30 Discussion

Actual exam question for F5's F5CAB1 exam
Question #: 30
Topic #: 1

A BIG-IP Administrator is responsible for deploying a new software image on an F5 BIG-IP HA pair and has scheduled a one-hour maintenance window. With a focus on minimizing service disruption, which of the following strategies is the most appropriate?

A. Update the active node first, reboot to the newly updated boot location and verify functionality, then push the update from the active to the standby node and reboot the standby node. B. Reset the Device Trust, apply the update to each node separately, reboot both nodes, then re- establish the Device Trust. C. Update the standby node first and reboot it to the newly updated boot location, failover to the newly updated node and verify functionality. Repeat the upgrade procedures on the next node, which is now in standby mode. D. Update both nodes in the HA pair, then reboot both nodes simultaneously to ensure they run the same software version.

Suggested Answer: C Vote an answer

For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizes service continuity, predictable failover, and minimal downtime. The established best-practice sequence is:
Upgrade the standby unit first
Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
Boot the standby unit into the newly installed version
Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
Perform a controlled failover to the upgraded unit
Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
Upgrade the second device (now standby)
The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
Option C exactly matches F5's documented production-safe upgrade method:
Upgrade the standby node first
Reboot into new image
Failover to upgraded device
Validate
Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.

by Barbara at May 26, 2026, 02:56 AM

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