The Realest Study Materials F5CAB4 Dumps Updated May 18, 2026
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F5 F5CAB4 Exam Syllabus Topics:
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NEW QUESTION # 25
A BIG-IP Administrator runs the initial configuration wizard and learns that the NTP servers were invalid.
In which area of the Configuration Utility should the BIG-IP Administrator update the list of configured NTP servers? (Choose one answer)
- A. System > Preferences
- B. System > Configuration
- C. System > Services
- D. System > Platform
Answer: B
Explanation:
On a BIG-IP system, NTP (Network Time Protocol) configuration is part of the system-level configuration settings. In the Configuration Utility, NTP servers are configured under the System 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 as ConfigSync, HA failover, logging, and certificate validation Why the other options are incorrect:
* A. System > Platform is used for hardware-related settings.
* B. System > Preferences manages UI and user preferences.
* C. System > Services controls system daemons and services, not time configuration.
Therefore, the correct answer is D. System > Configuration.
NEW QUESTION # 26
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?
- A. System > Archives
- B. Local Traffic > Virtual Servers
- C. System > Configuration
- D. Local Traffic > Policies
Answer: A
Explanation:
Managing the state of a device often involves restoring configuration backups known as User Configuration Set (UCS) files These archives contain the full system configuration, including licenses and SSL certificates.
The Control Plane provides a dedicated management area for these files under System > Archives, where administrators can upload, create, and restore configuration snapshots
NEW QUESTION # 27
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?
- A. System > Configuration > Local Traffic
- B. System > Logs > Audit2
- C. System > Configuration > Device3
- D. System > Logs > Configuration
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: 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
NEW QUESTION # 28
A BIG-IP Administrator makes a configuration change to a Virtual Server on the Standby device of an HA pair. The HA pair is currently configured with Auto-Sync Enabled. What effect will the change have on the HA pair configuration?
- A. The change will be propagated next time a configuration change is made on the Active device.
- B. The change will take effect when Auto-Sync propagates the config to the HA pair.
- C. The change will be undone next time a configuration change is made on the Active device.
- D. The change will be undone when Auto-Sync propagates the config to the HA pair.
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administratio24n Control Plane Administration documents: TMOS Device Service Cluste25ring (DSC) allows for configuration changes to be made on any device within a synchronization group. If Auto-Sync is enabled, the Control Plane detects the change on the Standby unit and automatically propagates (pushes) that updated configuration to the other members of the HA pair
NEW QUESTION # 29
A BIG-IP Administrator needs to find which modules have been licensed for use on the BIG-IP system. In which section of the Configuration Utility can the BIG-IP Administrator find this information?
- A. System > Services
- B. System > Platform
- C. System > Support
- D. System > Resource Provisioning
Answer: D
Explanation:
Identifying the current device status includes knowing which software modules (such as LTM, ASM, or APM) are active and how much hardware resource (CPU/Memory) is allocated to them40404040. The System > Resource Provisioning screen displays the licensing status and allows the administrator to set the provisioning level (Nominal, Dedicated, or Minimum) for each module.
NEW QUESTION # 30
Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the BIG-IP Configuration Utility? (Choose one answer)
- A. /var/log/httpd
- B. /var/log/ltm
- C. /var/log/pam/tallylog
- D. /var/log/secure
Answer: D
Explanation:
On BIG-IP systems, all authentication attempts for administrative access-including logins to the Configuration 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/tallylog tracks account lockouts and failed attempt counters, not detailed login attempts.
* /var/log/ltm logs traffic management events, not administrative authentication.
* /var/log/httpd logs 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.
NEW QUESTION # 31
The BIG-IP system is provisioned for LTM only. The BIG-IP Administrator is tasked with provisioning ASM.
What process restarts when the BIG-IP Administrator changes the module provisioning? (Choose one answer)
- A. tmm
- B. httpd
- C. sshd
- D. bd
Answer: A
Explanation:
When a BIG-IP Administrator changes module provisioning (for example, enabling ASM on a system previously provisioned only for LTM), the BIG-IP system must restart the Traffic Management Microkernel (TMM) process.
The TMM process is responsible for:
* Traffic handling
* LTM, ASM, and other traffic-processing modules
* Enforcing security and application policies
Provisioning changes affect how traffic modules are loaded and integrated into TMM. As a result, TMM is restarted, which causes a temporary interruption of traffic processing. This is expected behavior and is why module provisioning changes should be planned during a maintenance window.
Why the other options are incorrect:
* A. bd is related to blade/platform management, not module provisioning.
* C. sshd handles SSH access and is not affected by provisioning changes.
* D. httpd supports the Configuration Utility (GUI) and does not restart due to module provisioning.
Therefore, the correct answer is B. tmm.
NEW QUESTION # 32
A BIG-IP Administrator needs to load a UCS file but must exclude the license file.
How should the administrator perform this task? (Choose one answer)
- A. From the CLI with command tmsh load /sys ucs <ucs filename>
- B. From the CLI with command tmsh load /sys ucs <ucs filename> no-license
- C. From the GUI, select the UCS file and click Restore
- D. From the GUI, select the UCS file, uncheck the license box, and click Restore
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
When restoring a User Configuration Set (UCS) file, BIG-IP allows administrators to selectively exclude the license during the restore process. From the CLI, this is accomplished using the no-license option with the tmsh load /sys ucs command.
The command:
tmsh load /sys ucs <ucs filename> no-license
restores:
System configuration
Certificates and keys
Device and traffic objects
while explicitly 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:
A does not provide the option to exclude the license.
B restores the UCS including the license, which does not meet the requirement.
D is incorrect because the BIG-IP GUI does not provide a checkbox to exclude the license during UCS restore.
Therefore, the correct and supported method is C.
NEW QUESTION # 33
A BIG-IP Administrator uses a device group to share the workload and needs to perform service on a BIG-IP device currently active for a traffic group. The administrator needs to enable the traffic group to run on another BIG-IP device in the device group.
What should the administrator do to meet the requirement? (Choose one answer)
- A. Select Traffic Group and then select Failover
- B. Create a new Traffic Group and then fail to Standby Unit
- C. Select Traffic Group on Primary Unit and then select Demote
- D. Select Traffic Group and then select Force to Standby
Answer: A
Explanation:
Traffic Groups are the mechanism BIG-IP uses to control which device owns specific application traffic in a high-availability (HA) configuration. When maintenance is required on a device that is currently active for a traffic group, the correct and recommended action is to fail over that traffic group to another device in the device group.
* Failing over the traffic group moves 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:
* A is unnecessary and incorrect; traffic groups are not recreated for routine maintenance.
* C forces the entire device to 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 the Traffic Group and choosing Failover is the correct solution.
NEW QUESTION # 34
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
- A. /var/log/messages
- B. /var/log/secure
- C. /var/log/audit
- D. /var/log/user.log
Answer: C
Explanation:
Audit logging is a specialized feature within TMOS designed to track administrative actions. According to F5 documentation, whenever a system object (like a virtual server, pool, or profile) is created, modified, or deleted, the system records the event. These logs are stored specifically in /var/log/audit. This is essential for control plane administration to track "who did what and when" regarding the device configuration.
NEW QUESTION # 35
A BIG-IP Administrator needs to update the license on a BIG-IP device. Where can this be done?
- A. Device Management
- B. System > Platform
- C. System > Software Management
- D. System > License
Answer: D
Explanation:
Managing the license is a primary Control Plane task required to activate software modules and features on a BIG-IP device.
* License Management Utility: All actions related to the device license, including initial activation, renewal, and adding add-on keys, are performed under the System > License section of the Configuration Utility.
* Procedural Requirements: Licensing often requires the generation of a "dossier," which is a unique encrypted string used by the F5 License Server to generate the final license file.
* Impact on Services: Updating or re-activating a license generally requires a restart of system services (such as the tmm daemon), which will temporarily disrupt traffic processing unless performed on a standby unit in a high availability pair.
* Add-on Licenses: If an administrator needs to increase the capacity of a specific module (like increasing the SSL TPS limit or adding a new module like ASM), the new registration keys are entered through this same interface using the "Re-activate" button.
NEW QUESTION # 36
In which of the following log files would log events pertaining to pool members being marked "UP" or "DOWN" by their Health Monitors be written? (Choose one answer)
- A. /var/log/secure
- B. /var/log/audit
- C. /var/log/monitors
- D. /var/log/ltm
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems, Local Traffic Manager (LTM) is responsible for:
Pool and pool member management
Health monitor execution
Marking pool members UP or DOWN based on monitor results
Events related to health monitor status changes, including when pool members transition between UP and DOWN, are logged in /var/log/ltm.
Why the other options are incorrect:
/var/log/audit records administrative configuration changes, not runtime health status.
/var/log/secure logs authentication and authorization events.
/var/log/monitors is not a standard BIG-IP log file.
Therefore, the correct log file for pool member health monitor status events is /var/log/ltm.
NEW QUESTION # 37
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)
- A. System > Archives
- B. Local Traffic > Virtual Servers
- C. System > Configuration
- D. Local Traffic > Policies
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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.
NEW QUESTION # 38
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)
- A. Reactivate the license
- B. Generate a UCS
- C. Create a QKView
- D. tmsh save sys config
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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.
NEW QUESTION # 39
A BIG-IP device sends out the following SNMP trap: big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN. Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?
- A. Statistics > Performance > System
- B. System > Platform
- C. Network > Trunks > Trunk List
- D. Network > Interfaces > Interface List
Answer: D
Explanation:
Comprehensive and Detailed Explan13ation From BIG-IP Administration Control Plane Administration documents: Monitoring the physical status of the device is critical for reporting device health. In F5 nomenclature, "1.0", "1.1", etc., represent physical hardware interfaces. To verify if a physical link is up or down as reported by the Control Plane's SNMP agent, the administrator must check the Interface List located under Network > Interfaces
NEW QUESTION # 40
A BIG-IP Administrator is unable to connect to the management interface via HTTPS. What is a possible reason for this issue?
- A. An incorrect management route is specified.
- B. The IP address of the device used to access the management interface is NOT included in the "P Allow" list in the Configuration Utility.
- C. The IP address of the device used to access the management interface is NOT included in the "httpd Allow" list in the CLI.
- D. The port lockdown setting is configured to Allow None.
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Management connectivity is protected by an allowed access list for the httpd daemon. Unlike TMM data ports which use 'Port Lockdown' settings, the management port's access is controlled by a specific 'Allow' list323232. If an administrator's IP is not explicitly included in this list, the Control Plane will reject HTTPS connection attempts to the management utility33.
NEW QUESTION # 41
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