F5CAB4 Control Plane Administration Practice Question
An administrator needs to perform a massive configuration update. Which command should be used in TMSH to ensure the change is validated before application?
⚠ Common exam trap
Candidates often choose 'tmsh load sys config' without the 'verify' keyword, which would immediately overwrite the current configuration rather than checking it for potential syntax errors first.
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
✓
tmsh load sys config verify
Using the 'verify' option in TMSH allows the system to parse configuration changes and check for syntax or logical errors without actually applying them to the running configuration. This is essential for large updates because it prevents partial or broken configurations from being committed, which could lead to system instability, unintended traffic outages, or loss of management access, ensuring that updates are applied cleanly and safely.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
tmsh save sys config
Why it's wrong here
This command saves the current running configuration to disk. It does not perform any validation or checking of the configuration state. Saving an invalid configuration would make the system restore to a broken state upon reboot, which is the opposite of the intended goal of validating changes before application.
- ✓
tmsh load sys config verify
Why this is correct
The 'load sys config verify' command is specifically designed to check the syntax and validity of a configuration file against the current system state. It identifies errors without altering the running configuration, providing a safe mechanism for administrators to test changes before committing them to the active memory of the device.
- ✗
tmsh run util bash
Why it's wrong here
This drops the administrator into a bash shell. While useful for OS-level tasks, it does not provide built-in validation for BIG-IP configuration objects. Modifying objects via the bash shell directly bypasses the mcpd daemon's validation logic, which can lead to severe system inconsistency and configuration corruption over time.
- ✗
tmsh edit sys config
Why it's wrong here
This command opens the system configuration in a text editor. While it allows for manual modification, it does not provide an automated verification step before the changes are committed upon saving. Relying solely on 'edit' without manual verification can introduce syntax errors that might cause service disruption once the config is applied.
About these practice questions
Courseiva writes every F5CAB4 question from scratch — 40 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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 F5CAB4 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 F5CAB4 exam.