F5CAB1 Install, Initial Configuration, and Upgrade Practice Question
Exhibit
Sys::Tmstat Availability : green State : run Reason : The BIG-IP system operational status is active Availability : red Reason : Critical service tmm is suppressed SSM::Device end
Refer to the exhibit. An administrator reviews the system status after an upgrade attempt on a high-availability BIG-IP pair. The command output indicates a critical service failure. Which immediate diagnostic step should the administrator take?
⚠ Common exam trap
Candidates often suggest a reboot or factory reset as the first step. However, the correct professional approach is to first gather diagnostic data from logs to identify the root cause.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Access the command line interface to examine /var/log/ltm for initialization errors and verify license validity for the newly installed software version.
The command output highlights that the Traffic Management Microkernel is suppressed, indicating a critical hardware or software initialization failure following an upgrade. Investigating log files such as /var/log/ltm and /var/log/boot.log helps isolate whether the issue stems from corrupted configuration syntax, license mismatches, or incompatible software images during the boot process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reboot the active device immediately into the previous boot location and initiate a configuration sync across the high-availability peer.
Why it's wrong here
Rebooting into the previous boot location discards the failed upgrade's state before the critical service failure is diagnosed, and syncing propagates that state to the peer. It is tempting because boot-location rollback is a valid recovery path, but it is a remediation step, not the immediate diagnostic step requested.
- ✓
Access the command line interface to examine /var/log/ltm for initialization errors and verify license validity for the newly installed software version.
Why this is correct
Reviewing the Local Traffic Manager log provides granular details regarding why TMM failed to start. Verifying license validity is equally critical because upgraded software versions often enforce stricter support dates or require updated feature activation keys.
- ✗
Modify the BIG-IP platform properties file to disable hardware acceleration and restart the master control program daemon using bigstart restart.
Why it's wrong here
Disabling hardware acceleration is rarely a valid troubleshooting step for a suppressed TMM service and can severely degrade forwarding performance. Restarting mcpd without addressing underlying syntax or licensing issues will likely result in another failure.
- ✗
Run a complete factory default reset via the command line and restore the configuration from a UCS archive generated prior to the upgrade.
Why it's wrong here
A factory reset destroys the running configuration and any evidence needed to diagnose the failed service, so it is not an immediate diagnostic step. It is tempting because a UCS restore is a genuine recovery method after a failed upgrade, but only once diagnosis confirms the configuration is unrecoverable.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official F5 exam blueprint
This F5CAB1 practice question is part of Courseiva's free F5 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the F5CAB1 exam.