F5CAB4 Exam Questions & Answers
BIG-IP Administration Control Plane Administration • F5 Networks
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Sample F5CAB4 Questions
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New Syslog servers have been deployed in an organization. The BIG-IP Administrator must reconfigure the BIG-IP system to send log messages to these servers. In which location in the Configuration Utility can the BIG-IP Administrator make the needed configuration changes to accomplish this?
Managing how a BIG-IP communicates with external management services like Syslog is a core Control Plane task. The Configuration Utility organizes these settings under the 'System' menu. Specifically, to define remote logging destinations and formats, the administrator must navigate to System > Logs > Configuration to ensure the Control Plane correctly forwards system events to external collectors
A BIG-IP Administrator receives an RMA replacement for a failed F5 device. The Administrator tries to restore a UCS taken from the previous device, but the restore fails. The following error appears in the /var/log/ltm:
insufficient pool members. 01070608:3: License is not operational
(expired, digital signature does not match contents)
What should the BIG-IP Administrator do to avoid this error? (Choose one answer)
When restoring a UCS file to replacement hardware (RMA device), the license from the original device is not valid on the new system. If the UCS restore attempts to load the old license, BIG-IP reports license errors such as ''License is not operational'', which can prevent traffic objects (including pools and virtual servers) from loading correctly.
To avoid this issue, F5 documentation recommends restoring the UCS without the license, using the following command:
tmsh load /sys ucs <ucs filename> no-license
This approach:
Restores all configuration objects (LTM, networking, certificates, keys, etc.)
Excludes the invalid license tied to the old hardware
Allows the administrator to activate a new license separately on the replacement device
Why the other options are incorrect:
A . Remove the license information from the UCS archive
Not supported or recommended; UCS files should not be manually modified.
B . Revoke the license prior to restoring
License revocation does not prevent the UCS from attempting to load license data.
D . Reactivate the license on the new device using the manual activation method
This must be done after restoring the UCS and does not prevent the restore failure itself.
Therefore, the correct and supported method to avoid this error is C.
An organization is performing a major release upgrade to its BIG-IP system. The system is under medium load and has enough disk space to perform the upgrade.
Which pre-upgrade task is disruptive to regular system performance and should be performed during a maintenance window? (Choose one answer)
Reactivating a BIG-IP license is a traffic-disruptive operation. During the license reactivation process, the BIG-IP system performs a configuration reload, which results in a temporary interruption of all traffic processing. Because traffic handling is affected, F5 explicitly recommends scheduling license updates during a maintenance window.
This behavior is documented in F5 Knowledge Base articles, which state that license reactivation impacts traffic and must be planned accordingly during upgrades or system changes.
The other options are not considered disruptive:
Creating a QKView is primarily a diagnostic task and does not interrupt traffic.
Running tmsh save sys config only saves the running configuration to disk.
Generating a UCS is resource-intensive but does not reload configuration or interrupt traffic processing.
One of the two members of a device group has been decommissioned. The BIG-IP Administrator tries to delete the device group, but is unsuccessful. Prior to removing the device group, which action should be performed?
To maintain integrity in a High Availability environment, TMOS prevents the deletion of active Devic28e Groups. Procedurally, a device group is a container for synchronization; the Control Plane requires that you first strip the group of all associated members (devices) before the group object itself can be removed from the configuration.
A BIG-IP Administrator needs to restore a UCS file to an F5 device using the Configuration Utility.
Which section of the Configuration Utility should the BIG-IP Administrator access to perform this task? (Choose one answer)
In the BIG-IP Configuration Utility, all system backup and restore operations---including UCS (User Configuration Set) file restoration---are performed from the Archives section.
The correct navigation path is:
System > Archives
From this location, the administrator can:
Upload UCS files
Restore UCS backups
Manage system archive files used for backup and recovery
Why the other options are incorrect:
A . System > Configuration is used for general system settings, not backup restoration.
C . Local Traffic > Virtual Servers is used for application traffic objects.
D . Local Traffic > Policies manages traffic policies, not system backups.
Therefore, the correct section to restore a UCS file using the Configuration Utility is System > Archives.
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