F5 F5CAB4 BIG-IP Administration Control Plane Administration (F5CAB4) exam Exam Practice Test

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, SSH access restrictions are configured under the/sys sshdobject. Theallowproperty defines theIP addresses or networks permitted to connect to the management interface using SSH.

Thelistcommand is used to display the current configuration settings.

Therefore, tmsh list /sys sshd allow correctly displays the configured allowed IP ranges.

Why the other options are incorrect:

A (show)displays runtime or statistical information, not configuration values.

C and Dincorrectly reference /etc/hosts.allow; BIG-IP manages SSH access through TMSH objects, not by directly listing host files in this context.

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

Traffic Groups are the mechanism BIG-IP uses to controlwhich device owns specific application trafficin a high-availability (HA) configuration. When maintenance is required on a device that iscurrently active for a traffic group, the correct and recommended action is tofail over that traffic groupto another device in the device group.

Failing over the traffic groupmoves ownership of that traffic group (and the virtual servers associated with it) to another available device without forcing the entire device into standby.

This allows targeted maintenance while minimizing impact to other traffic groups that may still be active on the device.

Why the other options are incorrect:

Ais unnecessary and incorrect; traffic groups are not recreated for routine maintenance.

Cforces theentire deviceto standby, which may move more traffic than intended.

D(Demote) affects device trust/priority behavior and is not the standard or recommended method for moving traffic group ownership.

Therefore, selecting theTraffic Group and choosing Failoveris the correct solution.

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

When restoring aUser Configuration Set (UCS)file, BIG-IP allows administrators toselectively exclude the licenseduring the restore process. From theCLI, this is accomplished using the no-license option with the tmsh load /sys ucs command.

The command:

tmsh load /sys ucs no-license

restores:

System configuration

Certificates and keys

Device and traffic objects

whileexplicitly excluding the license file, which is required when:

Migrating configurations between devices

Restoring to hardware with a different license

Avoiding license conflicts or overwrites

Why the other options are incorrect:

Adoes not provide the option to exclude the license.

Brestores the UCSincluding the license, which does not meet the requirement.

Dis incorrect because the BIG-IP GUI doesnotprovide a checkbox to exclude the license during UCS restore.

Therefore, the correct and supported method isC.

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

A BIG-IPdevice group cannot be deleted if it still contains device members, even if one of those devices has already been decommissioned or is unreachable. Before deleting the device group, the administrator mustexplicitly remove the decommissioned device from the device group configuration.

Once the removed or unreachable device is deleted from the device group membership, the BIG-IP system allows the remaining administrator to successfully delete the device group.

Why the other options are incorrect:

A. Remove all members from the device groupThis is not required; the key requirement is removing thedecommissioned device, not all members.

B. Make sure all members are in syncSynchronization status does not prevent device group deletion.

D. Disable the device groupDevice groups cannot be disabled; they must be modified or deleted.

Therefore, the correct prerequisite action is toremove the decommissioned device from the device group, makingCthe correct answer.

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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:This log message indicates that the system is low on memory and has activated 'Aggressive Mode' to reclaim resources by closing old connections37. In an HA environment, one way to ensure state stability during memory pressure is to manage how connection data is handled38. While the document suggests D, procedural mitigation for 'Aggressive Mode' often involves reviewing resource provisioning or optimizing connection idle timeouts to reduce memory footprint39.

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: In a High Availability pair, the "Force to Standby" action is a Control Plane command used to trigger a manual failover. This option is only logical and available on the device that is currently in the Active state. If the button is greyed out, it indicates that the administrator is already logged into the Standby unit, which has no active traffic groups to relinquish.

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

On a BIG-IP system,NTP (Network Time Protocol) configurationis part of thesystem-level configuration settings. In the Configuration Utility, NTP servers are configured under theSystem configuration hierarchy.

The correct navigation path is:

System > Configuration > Device > NTP

This location allows the administrator to:

Add, modify, or remove NTP servers

Ensure accurate system time synchronization

Maintain proper time alignment required for features such asConfigSync,HA failover, logging, and certificate validation

Why the other options are incorrect:

A. System > Platformis used for hardware-related settings.

B. System > Preferencesmanages UI and user preferences.

C. System > Servicescontrols system daemons and services, not time configuration.

Therefore, the correct answer isD. System > Configuration.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Monitoring and reporting current device status involves tracking the health of traffic objects like Virtual Servers20. The Control Plane logs transition events—such as a Virtual Server moving from 'Available' (green) to 'Offline' (red) due to health monitor failures—in the /var/log/ltm file21212121. While the audit log tracks who changed a configuration, the LTM log tracks system-initiated status changes22222222.

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:

On a BIG-IP system,remote syslog server configurationis managed through the logging configuration framework. In the Configuration Utility, this is accessed via:

System > Logs > Configuration

This section allows the administrator to:

Defineremote syslog destinations

Configurelog publishers

Control which log types (system, audit, LTM, ASM, etc.) are forwarded to external syslog servers

Why the other options are incorrect:

A. System > Configuration > Local TrafficUsed for traffic management settings, not logging.

C. System > Logs > AuditDisplays audit log settings and content but does not configure remote syslog destinations.

D. System > Configuration > DeviceUsed for device-level settings such as hostname and platform configuration, not logging.

Therefore, the correct location to reconfigure BIG-IP to send logs to new syslog servers isSystem > Logs > Configuration.

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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:

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.