F5CAB1 Install, Initial Configuration, and Upgrade Practice Question
An administrator is upgrading a high-availability pair. What is the standard procedure to ensure zero-downtime during the upgrade process?
⚠ Common exam trap
Candidates often perform upgrades on both units simultaneously or without testing the standby. This risks a complete outage if the new version fails, violating the high-availability zero-downtime requirement.
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
✓
Upgrade the standby node first.
The standard procedure involves upgrading the standby unit first, ensuring it is healthy, then failing over traffic to the upgraded unit. Finally, the former active unit is upgraded. This approach ensures that one device is always ready to process traffic, maintaining high availability throughout the maintenance window. It mitigates the risk of a full outage and allows for immediate rollback if the new version displays unexpected behavior on the standby node.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Upgrade both units simultaneously.
Why it's wrong here
Upgrading both units simultaneously causes a total system outage. It also prevents the ability to roll back to a known-working state if the new version is unstable. F5 HA upgrades must be staggered to ensure continuous service availability and provide a recovery path if the upgrade fails.
- ✓
Upgrade the standby node first.
Why this is correct
Upgrading the standby unit while the active unit remains in production minimizes risk. Once the standby is upgraded, it can take over the active role during a planned failover. This ensures the production environment is always running on at least one node, maintaining consistent application delivery without interruption.
- ✗
Upgrade the active node first.
Why it's wrong here
Upgrading the active node first forces an unplanned failover to the standby node, which may not be ready or properly configured. This approach is highly risky and violates the best practice of maintaining service continuity. The standby should always be the target for the initial upgrade to ensure system readiness.
- ✗
Perform a 'force offline' on both nodes.
Why it's wrong here
Forcing both nodes offline takes the entire system down, which is the opposite of the goal of high availability. This would result in a total service outage for all applications. Proper procedures focus on keeping one node online at all times to continue serving traffic during the upgrade process.
About these practice questions
This F5CAB1 question is part of Courseiva's 80-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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 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.