F5 BIG-IP Administration Control Plane Administration (F5CAB4) exam F5CAB4 Exam Dumps: Updated Questions & Answers (December 2025)

Comprehensive and Detailed Explanation From BIG-IP Administration20 Control Plane Administration documents: Connectivity management involves ensuring that the physical layer matches the networking environment. Interface properties, including media speed, duplex settings, and MTU, are managed at the Control Plane level under the Network menu. To resolve a mismatch with an upstream switch, the administrator must navigate to Network > Interfaces to manually override auto-negotiation settings.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

On BIG-IP systems,all authentication attemptsfor administrative access—including logins to theConfiguration Utility (GUI)—are logged in/var/log/secure. This log file records:

Successful and failed login attempts

The username used

The authentication method (local, LDAP, RADIUS, etc.)

Access denials and PAM authentication errors

Why the other options are incorrect:

/var/log/pam/tallylogtracks account lockouts and failed attempt counters, not detailed login attempts.

/var/log/ltmlogs traffic management events, not administrative authentication.

/var/log/httpdlogs web server activity but does not record authentication success or failure for BIG-IP administrative users.

Therefore, the correct log file to verify whether a user attempted to log in to the BIG-IP Configuration Utility is/var/log/secure.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Reporting device status includes monitoring physical resource exhaustion, such as memory48. The Control Plane provides both a command-line method via TMSH (show /sys memory) and a graphical method under Statistics > Module Statistics > Memory to report on how memory is allocated across TMM and the Linux host494949494949494949. This is essential for identifying potential "Aggressive Mode" triggers or hardware performance bottlenecks50.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

When restoring aUCS file to replacement hardware (RMA device), thelicense from the original device is not validon 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 UCSwithout the license, using the following command:

tmsh load /sys ucs 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 toactivate a new license separatelyon the replacement device

Why the other options are incorrect:

A. Remove the license information from the UCS archiveNot supported or recommended; UCS files should not be manually modified.

B. Revoke the license prior to restoringLicense revocation does not prevent the UCS from attempting to load license data.

D. Reactivate the license on the new device using the manual activation methodThis must be doneafterrestoring the UCS and does not prevent the restore failure itself.

Therefore, the correct and supported method to avoid this error isC.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

In the BIG-IPConfiguration Utility, all system backup and restore operations—includingUCS (User Configuration Set) file restoration—are performed from theArchivessection.

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 > Configurationis used for general system settings, not backup restoration.

C. Local Traffic > Virtual Serversis used for application traffic objects.

D. Local Traffic > Policiesmanages traffic policies, not system backups.

Therefore, the correct section to restore a UCS file using the Configuration Utility isSystem > Archives.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

In a BIG-IPDevice Service Cluster (DSC), manual configuration synchronization is performed using theConfigSyncframework. The supported and documented command to manually push the local configuration to a specific device group is:

tmsh run cm config-sync to-group

This command:

Initiates aone-time manual ConfigSync

Pushes the local device’s configuration to all members of the specified device group

Is commonly used whenauto-sync is disabledor when the administrator wants explicit control over synchronization timing

Why the other options are incorrect:

Ais not a valid TMSH command for ConfigSync.

Benables auto-sync but doesnotperform an immediate synchronization.

Dis not a valid or supported TMSH command for device group configuration synchronization.

Therefore, the correct command to manually synchronize configuration to a device group isC.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

BIG-IP providestwo supported and documented methodsto manually force a device intostandbystate in a high-availability (HA) configuration:

CLI method (A):

tmsh run /sys failover device standby

This is the correct and supported TMSH command to force thelocal deviceto transition fromactivetostandby.

Configuration Utility method (B):Navigating toDevice Management > Devices > Local Device (Self)and selectingForce to Standbyperforms the same operation through the GUI and is fully supported.

Why the other options are incorrect:

C is incorrect: Traffic Groups do not provide a “Force to Standby” option for the local device; traffic groups are used to manage which device owns specific traffic, not to force device-level failover.

D is incorrect: tmsh run /sys failover standby isnot a valid TMSH command. The correct syntax requires device standby.

Thus, the correct answers areA and B.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: F5 architecture distinguishes between the Data Plane (TMM processing application traffic) and the Control Plane (Linux host processing management tasks). High Control Plane CPU utilization typically points to administrative activities such as heavy GUI usage, complex API calls (iControl), large-scale configuration synchronizations, or intensive logging/monitoring tasks rather than the actual switching or load balancing of application data.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The BIG-IP Control Plane monitors the "Commit ID" of the configuration on all group members. When a change is made on the Standby unit, it becomes the member with the most recent configuration. The "Recommended Action" in the HA status dashboard will be to synchronize that specific device's configuration to the rest of the group to ensure consistency

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The "Management Port" is distinct from TMM data ports. Configuration for global platform-level settings, including administrative access restrictions (IP Allow lists for SSH and HTTPS) for the management port, is found under System > Platform. This is a critical Control Plane hardening step to prevent unauthorized remote access

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