[2026] F5CAB4 Actual Exam Dumps, F5CAB4 Practice Test
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F5 F5CAB4 Exam Syllabus Topics:
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NEW QUESTION # 35
A BIG-IP Administrator is setting up a new BIG-IP device. The network administrator reports that the interface has an incompatible media speed. The BIG-IP Administrator needs to change this setting manually.
From which location should the BIG-IP Administrator perform this task?14
- A. In the TMOS Shell Command line16
- B. On the Front Console15
- C. In the Configuration Utility, System > Configuration18
- D. In the Configuration Utility, Network > Interface17
Answer: D
Explanation:
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.
NEW QUESTION # 36
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 # 37
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 > Logs > Configuration
- B. System > Logs > Audit
- C. System > Configuration > Device
- D. System > Configuration > Local Traffic
Answer: A
Explanation:
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 # 38
A BIG-IP Administrator needs to fall over the active device. The administrator logs into the Configuration Utility and navigates to Device Management > Traffic Group. However, "Force to Standby" is greyed out. What is causing this issue?
- A. The BIG-IP Administrator is logged in as administrator
- B. The BIG-IP Administrator is on the Standby Device
- C. The BIG-IP Administrator is NOT logged into command line to tail over
- D. The BIG-IP Administrator is logged in as root
Answer: B
Explanation:
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.
NEW QUESTION # 39
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)
- A. Reactivate the license on the new device using the manual activation method
- B. Revoke the license prior to restoring
- C. Use the appropriate tmsh command with the no-license option
- D. Remove the license information from the UCS archive
Answer: C
Explanation:
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 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 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.
NEW QUESTION # 40
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 > Logs > Configuration
- B. System > Configuration > Device3
- C. System > Logs > Audit2
- D. System > Configuration > Local Traffic
Answer: A
Explanation:
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 # 41
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 Force to Standby
- B. Select Traffic Group on Primary Unit and then select Demote
- C. Select Traffic Group and then select Failover
- D. Create a new Traffic Group and then fail to Standby Unit
Answer: C
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 # 42
What is the role of TMM (Traffic Management Microkernel)?
- A. Provides GUI access
- B. Stores configuration files
- C. Processes application traffic
- D. Handles authentication
Answer: C
Explanation:
TMM runs in the data plane and is responsible for high-performance packet processing.
NEW QUESTION # 43
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 > Services
- B. System > Preferences
- C. System > Configuration
- D. System > Platform
Answer: C
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
NEW QUESTION # 44
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 > Configuration
- B. System > Archives
- C. Local Traffic > Virtual Servers
- D. Local Traffic > Policies
Answer: B
Explanation:
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
NEW QUESTION # 45
A BIG-IP Administrator needs to change the management IP address of a BIG-IP device. Where should the administrator perform this task?
- A. System > Platform
- B. Network > Interfaces
- C. Network > VLANs
- D. Network > Self IPs
Answer: A
NEW QUESTION # 46
Administrative user accounts have been defined on the remote LDAP server and are unable to log in to the BIG-IP device. Which log file should the BIG-IP Administrator check to find the related messages?28
- A. /var/log/ltm
- B. /var/log/messages
- C. /var/log/secure
- D. /var/log/user.log
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP A34dministration Control Plane Administration documents: Authentication and authorization events are handled by the system's PAM (Pluggable Authentication Modules). For Control Plane security auditing, all login attempts-whether local or remote (LDAP/RADIUS/TACACS+)-and SSH-related security events are recorded in /var/log/secure. This is the primary log for troubleshooting administrative access issues
NEW QUESTION # 47
Which TMSH command initiates a manual configuration synchronization to the specified device group?
(Choose one answer)
- A. tmsh run cm config-sync to-group <device_group>
- B. tmsh run sys device-group update-config
- C. tmsh modify sys failover auto-sync enable
- D. tmsh load sys config to-group <device_group>
Answer: A
Explanation:
In a BIG-IP Device Service Cluster (DSC), manual configuration synchronization is performed using the ConfigSync framework. The supported and documented command to manually push the local configuration to a specific device group is:
tmsh run cm config-sync to-group <device_group>
This command:
* Initiates a one-time manual ConfigSync
* Pushes the local device's configuration to all members of the specified device group
* Is commonly used when auto-sync is disabled or when the administrator wants explicit control over synchronization timing Why the other options are incorrect:
* A is not a valid TMSH command for ConfigSync.
* B enables auto-sync but does not perform an immediate synchronization.
* D is not a valid or supported TMSH command for device group configuration synchronization.
Therefore, the correct command to manually synchronize configuration to a device group is C.
NEW QUESTION # 48
A BIG-IP Administrator needs to fall over the active device. The administrator logs into the Configuration Utility and navigates to Device Management > Traffic Group. However, "Force to Standby" is greyed out. What is causing this issue?
- A. The BIG-IP Administrator is logged in as administrator
- B. The BIG-IP Administrator is on the Standby Device
- C. The BIG-IP Administrator is NOT logged into command line to tail over
- D. The BIG-IP Administrator is logged in as root
Answer: B
Explanation:
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.
NEW QUESTION # 49
A BIG-IP Administrator must determine if a Virtual Address is configured to fail over to the standby member of a device group. In which area of the Configuration Utility can this be confirmed?
- A. Device Management > Traffic Groups
- B. Device Management > Overview36
- C. Device Management > Devices34
- D. Local Traffic > Virtual Servers35
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration do38cuments: While HA state is managed under "Device Management," the specific failover behavior of a traffic object is linked to its configuration. A Virtual Address must be associated with a "Traffic Group" (usually traffic-group-1) to fail over. This association and the resulting floating status can be verified by viewing the Virtual Server or Virtual Address list under Local Traffic > Virtual Servers.
NEW QUESTION # 50
What is the primary function of the control plane in BIG-IP?
- A. Processes application traffic
- B. Handles packet forwarding
- C. Encrypts SSL traffic
- D. Manages configuration and system state
Answer: D
Explanation:
The control plane is responsible for system management, configuration, and orchestration, while the data plane processes traffic.
NEW QUESTION # 51
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. Create a QKView
- B. tmsh save sys config
- C. Generate a UCS
- D. Reactivate the license
Answer: D
NEW QUESTION # 52
Which role has full administrative access in BIG-IP?
- A. Operator
- B. Resource Administrator
- C. Administrator
- D. Guest
Answer: C
Explanation:
The Administrator role has complete access to all system features.
NEW QUESTION # 53
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