F5CAB1 Install, Initial Configuration, and Upgrade Practice Question
Which step must be taken to ensure that an F5 BIG-IP device is properly licensed before it can be used for load balancing?
⚠ Common exam trap
Candidates frequently assume that provisioning specific modules or installing software is the first step, ignoring that the registration key must be activated 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
✓
Activate the registration key with F5.
Licensing is a mandatory prerequisite that defines the capacity and features of the BIG-IP platform. This process verifies the entitlement of the unit through F5's activation servers. Mastering this step is essential for any administrator, as it is the very first task in any new installation, and the device will not allow any traffic-processing modules to be provisioned until the license is validated and applied.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Activate the registration key with F5.
Why this is correct
The registration key is the entitlement proof. Activating it generates the license file required by the BIG-IP. This file contains the information about which modules (like LTM or ASM) are allowed to run and the performance limitations of the unit, which the system enforces immediately upon installation.
- ✗
Manually add the license to the /etc/hosts file.
Why it's wrong here
The /etc/hosts file is used for hostname-to-IP resolution and is not the location for license keys. Attempting to add licensing information there will not work and could disrupt network communications. Licenses must be applied via the proper GUI or CLI commands designed for license management.
- ✗
Download a license from a third-party vendor.
Why it's wrong here
Licenses are issued exclusively by F5 Networks. Third-party vendors do not provide valid F5 licenses. Using a non-official license file will result in a failure during the validation process, leaving the device in an unlicensed state and preventing the provisioning of any load balancing or security modules.
- ✗
Run a packet capture on the management interface.
Why it's wrong here
A packet capture is a diagnostic tool used to observe traffic flows. It provides no mechanism for licensing the device. While it can be used to troubleshoot why a license request might be failing, it is not a part of the licensing process itself.
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.