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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration: Install, Initial Configuration, and Upgrade |
| Exam Number: | F5CAB1 |
| Exam Format: | Multiple Choice |
| Related Certifications: | F5 Certified Technology Specialist (LTM) F5 Certified BIG-IP Administrator |
| Available Languages: | English |
| Recommended Training: | F5 BIG-IP Administration Fundamentals Course F5 LTM Essentials Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB1 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge (TCP/IP, routing concepts) recommended |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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NEW QUESTION # 18
A BIG-IP Administrator is responsible for deploying a new software image on an F5 BIG-IP HA pair and has scheduled a one-hour maintenance window.
With a focus on minimizing service disruption, which of the following strategies is the most appropriate?
Answer: A
Explanation:
For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizesservice continuity, predictable failover, andminimal downtime. The established best-practice sequence is:
* Upgrade the standby unit first
* Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
* Boot the standby unit into the newly installed version
* Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
* Perform a controlled failover to the upgraded unit
* Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
* Upgrade the second device (now standby)
* The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
OptionCexactly matches F5's documented production-safe upgrade method:
* Upgrade thestandbynode first
* Reboot into new image
* Failover to upgraded device
* Validate
* Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.
Why the other options are incorrect:
A). Upgrade the active node first
* Upgrading the active device requires removing it from service and failing over abruptly. This is not recommended and increases service disruption risk.
B). Resetting device trust
* Resetting trust is unnecessary and can disrupt configuration sync, peer communication, and cluster operation. It is not part of any standard upgrade workflow.
D). Upgrading and rebooting both nodes simultaneously
* This would causetotal outage, because both HA members would be unavailable at the same time.
NEW QUESTION # 19
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
Answer: B
Explanation:
Self-IPs implement a security feature known asPort Lockdown, which limits which services are reachable on a Self-IP.
However, certain services required for BIG-IP device-to-device communication bypass Port Lockdown to ensure cluster and HA functionality.
TCP 4353
* TCP port4353is used byDevice Service Clustering (DSC)for:
* Device trust establishment
* Configuration synchronization
* Failover communication
* Because BIG-IP devices must always be able to communicate for HA functions to remain operational, port 4353 isexempt from Port Lockdown rules.
Why the other options are incorrect
A). TCP 443
* Not required for device trust or synchronization.
* HTTPS access is fully controlled by Port Lockdown.
C). UDP 53
* DNS traffic is not required for synchronization and has no exemption under Port Lockdown.
NEW QUESTION # 20
For an upgrade of a standalone BIG-IP, a maintenance window is available in which brief interruptions are allowed.
Actions with no impact can be done outside the maintenance window.
When should a license reactivation be performed?
Answer: A
Explanation:
License reactivation updates the BIG-IP device's license file to ensure:
* TheService Check Dateis current
* The device is eligible to install the intended TMOS version
* Any module entitlement updates are received
Reactivationdoes not interrupt trafficand does not require a reboot, making it safe to performbeforethe maintenance window.
F5 best practices state:
* Performall non-impact tasks priorto the scheduled maintenance window
* Leave the window available for activities that require rebooting, such as the software installation itself Since license reactivation isnon-disruptive, it should be donebeforethe upgrade window starts.
NEW QUESTION # 21
What is required when setting up an HA (High Availability) pair of BIG-IP devices?
Answer: D
Explanation:
For HA to function correctly, both devices need to be running the same software version and have the same hardware model to ensure compatibility and synchronization.
NEW QUESTION # 22
A BIG-IP Administrator needs to install a HotFix on a standalone BIG-IP device.
The device currently has HD1.1 as the Active Boot Location.
The administrator has already reactivated the license and created a UCS archive.
In which sequence should the administrator perform the remaining steps?
Answer: A
Explanation:
When installing a software upgrade with a HotFix on BIG-IP, the correct workflow requires:
Install the base TMOS image on an unused boot volume
Install the corresponding HotFix onto that same boot volume
Activate the updated boot volume to boot into the new software
This method ensures:
The existing active system (HD1.1) is untouched
The upgrade occurs in a new, clean volume (HD1.2)
The HotFix applies properly to the same base image
The administrator can revert to HD1.1 if issues occur
Option C matches the correct F5 upgrade sequence:
1. Install base image on HD1.2
2. Install HotFix on HD1.2
3. Activate HD1.2
NEW QUESTION # 23
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