(Mar-2026) F5CAB4 Exam Dumps Contains FREE Real Quesions from the Actual Exam
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F5 F5CAB4 Exam Syllabus Topics:
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NEW QUESTION # 28
A BIG-IP Administrator plans to resolve a non-critical issue with a BIG-IP device in 2 weeks. What Severity level should be assigned to this type of F5 support ticket?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
F5 Support uses a specific scale to categorize the urgency of technical issues, which helps the Control Plane management team prioritize resources effectively.
* Severity 1 (Critical): Used for emergency situations where a production site is completely down, or there is a critical impact on business operations with no workaround available.
* Severity 2 (High): Assigned when a system is severely degraded, or a primary function is significantly impacted, but the site remains operational in a degraded state.
* Severity 3 (Medium): Applicable for issues where there is a partial loss of non-critical functionality, or the system is failing intermittently but the core business is not currently impacted.
* Severity 4 (Low): This is the appropriate level for non-critical issues, general "how-to" questions, or maintenance planning. Since the administrator plans to resolve this issue in two weeks, it falls under the category of a low-priority maintenance task that does not require an immediate response from F5 support.
NEW QUESTION # 29
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/ltm
- B. /var/log/secure
- C. /var/log/httpd
- D. /var/log/pam/tallylog
Answer: B
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 # 30
The BIG-IP Administrator runs the command:
netstat -an | grep 443
and sees the following output:
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
What does this output indicate about the service on port 443? (Choose one answer)
- A. The service is actively listening only on the loopback interface.
- B. The service is actively listening on all interfaces for HTTPS traffic.
- C. The service is in a standby state and unable to accept connections.
- D. The service indicates no connections to the LISTEN port.
Answer: B
Explanation:
In netstat output:
* 0.0.0.0:443 means the service is bound to all available IPv4 interfaces on the system.
* LISTEN indicates the service is actively waiting for incoming connection requests.
Therefore, this output confirms that a service (commonly HTTPS/443, such as the BIG-IP Configuration Utility or an application listener) is actively listening on all interfaces, making B the correct answer.
Why the other options are incorrect:
* A would show 127.0.0.1:443 if it were loopback-only.
* C is incorrect because LISTEN explicitly indicates readiness to accept connections.
* D is unrelated; standby state does not affect socket binding shown by netstat.
Hence, the correct answer is B.
NEW QUESTION # 31
What are the recommended methods for forcing a BIG-IP system to standby mode? (Choose two answers)
- A. Active BIG-IP: Configuration Utility > Device Management > Devices > Local Device (Self) > Force to Standby
- B. Active BIG-IP: Configuration Utility > Device Management > Traffic Groups > Local Device (Self) > Force to Standby
- C. Active BIG-IP: CLI > tmsh run /sys failover device standby
- D. Active BIG-IP: CLI > tmsh run /sys failover standby
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
BIG-IP provides two supported and documented methods to manually force a device into standby state 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 the local device to transition from active to standby.
Configuration Utility method (B):
Navigating to Device Management > Devices > Local Device (Self) and selecting Force to Standby performs 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 is not a valid TMSH command. The correct syntax requires device standby.
Thus, the correct answers are A and B.
NEW QUESTION # 32
A configuration change is made on the standby member of a device group. What is displayed as "Recommended Action" on the Device Management Overview screen?
- A. Force active member of device group to standby
- B. Synchronize the standby member configuration to the group
- C. Activate device with the most recent configuration
- D. Synchronize the active member configuration to the group.
Answer: B
Explanation:
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
NEW QUESTION # 33
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. httpd
- B. tmm
- C. sshd
- D. bd
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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 # 34
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/audit
- B. /var/log/secure
- 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 # 35
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? (Choose one answer)
- A. System > Configuration > Device
- B. System > Configuration > Local Traffic
- C. System > Logs > Configuration
- D. System > Logs > Audit
Answer: C
Explanation:
On a BIG-IP system, remote syslog server configuration is managed through the logging configuration framework. In the Configuration Utility, this is accessed via:
System > Logs > Configuration
This section allows the administrator to:
* Define remote syslog destinations
* Configure log 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 is System > Logs > Configuration.
NEW QUESTION # 36
Refer to the exhibit.
The BIG-IP Administrator is investigating disk utilization on the BIG-IP device. What should the BIG-IP Administrator check next? (Choose one answer)
- A. Large files on the / file system
- B. Large files on /usr file system
- C. Results from the EUD test
- D. Results from the platform diagnostics test
Answer: A
Explanation:
When troubleshooting a BIG-IP system where a partition is reported as full (100% utilization), identifying and removing large or unnecessary files is the immediate next step for restoration of system stability.
* Symptoms of Full Partitions: If a file system (such as the root / or /var) becomes full, it can result in unpredictable system behavior, failure to save configurations, and the inability to log in to the Web UI.
* The Root (/) Partition: This partition is intentionally kept small on F5 systems. It is highly sensitive to the storage of third-party software or diagnostic files that should ideally be stored in the /shared or /var directories.
* Procedural Resolution: To resolve 100% disk usage, administrators should check for large files on the affected partition using CLI commands like du -ah or find / -xdev -type f -exec du {} \; | sort -rn | head
-20.
* Common Culprits: Large files typically causing these issues include old core files, tech support bundles, large diagnostic logs (packet diags), or temporary files created during administrative tasks.
* Diagnostics vs. Remediation: While tests like the EUD (End User Diagnostics) or platform diagnostics are useful for hardware verification, they do not resolve file system exhaustion issues that have already reached a critical 100% state.
NEW QUESTION # 37
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status?
- A. /var/log/audit
- B. /var/log/lastlog
- C. /var/log/monitors
- D. /var/log/ltm
Answer: D
Explanation:
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.
NEW QUESTION # 38
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 > Resource Provisioning
- C. System > Platform
- D. System > Support
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: 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 # 39
What can the BIG-IP Administrator do when restoring BIG-IP configuration files with a UCS archive?
(Choose two answers)
- A. The BIG-IP Administrator can restore a UCS archive on a BIG-IP system on a different platform.
- B. The BIG-IP Administrator can restore a UCS archive on a BIG-IP system running a later software version than the version of software the UCS archive was created on.
- C. The BIG-IP Administrator can only restore a UCS archive on a BIG-IP system running the same version.
- D. The BIG-IP Administrator can only restore the UCS archive to the same system from which it was saved.
Answer: A,B
Explanation:
The User Configuration Set (UCS) is a flexible tool designed by the Control Plane to handle various lifecycle management scenarios, including upgrades and hardware migrations.
* Version Compatibility (Option B): TMOS is designed to be backward compatible. The Control Plane can ingest a UCS file created on an older version of software and automatically upgrade the configuration objects to match the current, later version during the restore process.
* Platform Portability (Option C): While a UCS archive contains platform-specific information, the BIG-IP system allows for "platform-independent" restores. This is a vital procedural concept for migrating from one hardware model to another or from physical hardware to a Virtual Edition (VE).
* Management of State: When restoring to a different platform or a later version, the administrator often uses specific flags (such as no-license or platform-migrate in later versions) to ensure that only the portable configuration data is applied while preserving the new platform's unique identifiers.
NEW QUESTION # 40
A BIG-IP Administrator needs to restore an encrypted UCS archive from the command line using the TMSH utility. Which TMSH command should the BIG-IP Administrator use to accomplish this?
- A. load /sys ucs <filepath> no-license
- B. load /sys config file <filepath>
- C. load /sys ucs <filepath> passphrase <password>
- D. load /sys config file <filepath> passphrase <password>
Answer: C
Explanation:
Restoring system states from backups is a fundamental Control Plane administrative task2. When a User Configuration Set (UCS) archive is created with encryption, it requires the correct passphrase to be decrypted and loaded during the restoration process.
* UCS Command Structure: The tmsh load /sys ucs command is the specific utility for restoring these comprehensive configuration archives.
* Encrypted Restores: If the archive was encrypted during creation, the passphrase argument must be appended to the command followed by the actual password used to encrypt the file.
* Comparison with Other Options:
* load /sys config file is used for loading text-based configuration files (like bigip.conf), not full UCS archives6.
* The no-license flag is used when you want to restore a configuration without overwriting the existing license (common during RMA replacements), but it does not provide the mechanism for entering an encryption passphrase.
NEW QUESTION # 41
A BIG-IP Administrator needs to update the list of configured NTP servers. In which area of the Configuration Utility should the BIG-IP Administrator perform this update?
- A. System > Services
- B. System > Configuration
- C. System > Platform
- D. System > Preferences
Answer: B
Explanation:
NTP (Network Time Protocol) is vital for management connectivity and HA state synchronization. Correct time is required for log timestamping and device trust group communication46. To manage these settings, the administrator navigates to System > Configuration, where general system-level services like NTP and DNS are defined to ensure the Control Plane remains synchronized with the network environment.
NEW QUESTION # 42
A BIG-IP Administrator needs to verify system time synchronization. Where should this be checked?
- A. System > Configuration > Device
- B. System > Software Management
- C. System > Logs
- D. System > Platform
Answer: A
Explanation:
Time synchronization is a critical component of Control Plane management, as it ensures that logs are accurately timestamped and that High Availability (HA) trust relationships remain valid1.
* Configuration Location: The list of configured NTP (Network Time Protocol) servers and their status is managed under System > Configuration > Device > NTP .
* Procedural Importance: If the system clock drifts significantly between two devices in an HA pair, the Control Plane may experience a "Time Delta" error33. This drift often causes a failure in device trust, preventing the ConfigSync process from functioning correctly.
* System Integrity: Accurate time is also essential for the validity of SSL/TLS certificates used for both administrative management access and high availability communication.
* Verification: Administrators can use this section of the Configuration Utility to confirm that the BIG- IP is communicating with its designated upstream time sources and that the local clock is correctly synchronized to the network environment .
NEW QUESTION # 43
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 take effect when Auto-Sync propagates the config to the HA pair.
- B. The change will be undone next time a configuration change is made on the Active device.
- C. The change will be undone when Auto-Sync propagates the config to the HA pair.
- D. The change will be propagated next time a configuration change is made on the Active device.
Answer: A
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 # 44
Users are unable to reach an application. The BIG-IP Administrator checks the Configuration Utility and observes that the Virtual Server has a red diamond in front of the status.
What is causing this issue? (Choose one answer)
- A. All pool members have been disabled
- B. All pool members are down
- C. The Virtual Server is receiving HTTPS traffic over an HTTP virtual
- D. The Virtual Server is disabled
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
In the BIG-IP Configuration Utility, status icons provide immediate health information. A red diamond specifically indicates that the object itself is administratively disabled. When a virtual server is disabled, BIG-IP will not accept or process traffic for that virtual server, regardless of pool or node state.
If all pool members were down, the virtual server would typically show a yellow triangle (available but no resources).
If all pool members were disabled, the virtual server would usually still be enabled but unavailable due to pool status, not shown as a red diamond.
Protocol mismatch (HTTPS sent to HTTP) does not change the administrative status icon of the virtual server.
Therefore, the red diamond clearly indicates the virtual server is disabled, making D the correct answer.
NEW QUESTION # 45
The BIG-IP appliance fails to boot. The BIG-IP Administrator needs to run the End User Diagnostics (EUD) utility to collect data to send to F5 Support. Where can the BIG-IP Administrator access this utility?
- A. Management Port
- B. Internal VLAN interface
- C. External VLAN interface
- D. Console Port
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The EUD is a 33hardware-level diagnostic tool that runs outside of the TMOS operating system. Because it is used when the system cannot boot or is in a pre-boot state, it cannot be accessed via the GUI or management network. The administrator must connect physically via the serial Console Port to interact with the boot menu and initiate the hardware tests.
NEW QUESTION # 46
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