Exam F5CAB2 Topic 1 Question 46 Discussion

Actual exam question for F5's F5CAB2 exam
Question #: 46
Topic #: 1
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?

Suggested Answer: A Vote an answer

The F5 BIG-IP upgrade process for HA pairs requires a specific "staggered" approach to maintain uptime.
* Version Mismatch: When one unit is upgraded to a newer version of TMOS (e.g., from 15.1 to 16.1), it enters a26 "Version Mismatch" 27state with its peer.
* Configuration Sync: Because the configuration schemas between different versions are often incompatible, ConfigSync should not be performed. Attempting to sync a newer configuration to an older system (or vice-versa) can cause configuration corruption or system instability.
* Failover Capability: Generally, a pair with a version mismatch can still fail over to ensure traffic continuity during the upgrade window, but administrative changes and syncs must be paused until both units are on the same version.

by Giselle at Jul 10, 2026, 03:23 AM

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