2026 100% Free F5CAB4 Daily Practice Exam With 73 Questions
F5CAB4 exam torrent F5 study guide
F5 F5CAB4 Exam Syllabus Topics:
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NEW QUESTION # 10
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 > Overview36
- B. Device Management > Devices34
- C. Device Management > Traffic Groups
- 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 # 11
One of the two members of a device group has been decommissioned. The BIG-IP Administrator tries to delete the device group, but is unsuccessful. Prior to removing the device group, which action should be performed?
- A. Remove all members from the device group
- B. Disable the device group
- C. Make sure all members of the device group are in sync
- D. Remove the decommissioned device from the device group
Answer: A
Explanation:
To maintain integrity in a High Availability environment, TMOS prevents the deletion of active Device Groups. Procedurally, a device group is a container for synchronization; the Control Plane requires that you first strip the group of all associated members (devices) before the group object itself can be removed from the configuration.
NEW QUESTION # 12
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?
- A. Set up Failover Method to HA Order
- B. Enable Failover Multicast Configuration
- C. Configure MAC Masquerade
- D. Configure a global SNAT Listener
Answer: C
Explanation:
When a failover occurs, the newly active device must inform the surrounding network that it now "owns" the shared IP addresses. Without MAC Masquerade, the new device uses its own hardware MAC, requiring upstream routers to update their ARP tables (which causes a delay). MAC Masquerading allows the HA pair to share a "floating" MAC address, ensuring the Control Plane transition is transparent to the network layer
NEW QUESTION # 13
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. Synchronize the active member configuration to the group.
- B. Force active member of device group to standby
- C. Activate device with the most recent configuration
- D. Synchronize the standby member configuration to the group
Answer: D
Explanation:
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 # 14
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?
- A. /var/log/ltm
- B. /var/log/daemon.log
- C. /var/log/audit
- D. /var/log/kern.log
Answer: A
Explanation:
Although /var/log/ltm is primarily associated with Local Traffic Manager events, it is also the primary destination for system-level alerts generated by the Control Plane's chmand (Chassis Manager Daemon).
Hardware status changes, including power supply failures, fan speeds, and temperature warnings, are logged as "notice" or "critical" events within the LTM log file.
NEW QUESTION # 15
An LTM device has a virtual server mapped to www.f5.com. Users report that when they connect to /resources/201.1.2h.l_l.com they are unable to receive content. What is the likely cause of the issue?
- A. The virtual address does not have ARP enabled.
- B. The pool associated with the virtual server is falling its health check.
- C. The virtual address does not have route advertising enabled.
- D. The pool associated with the virtual server does not have priority group activation enabled.
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The Control Plane is responsible for ARP (Address Resolution Protocol) management for Virtual Addresses. For a Virtual Server to be reachable, the BIG-IP must respond to ARP requests for that IP. If the "ARP" setting is disabled on the Virtual Address properties, upstream routers cannot resolve the MAC address of the BIG-IP, leading to connectivity failure even if the service itself is "Available."
NEW QUESTION # 16
A BIG-IP Administrator finds the following log entry: tnm tmm[7141]: 011e0002:4: sweeper_update: aggressive mode activated. Which action should the BIG-IP Administrator take to mitigate this memory issue?
- A. Configure the server to use Connection Mirroring
- B. Decrease the TCP profile Idle Timeout value
- C. Configure the redundant pair to be active-active
- D. Increase the TCP profile Idle Timeout value
Answer: A
Explanation:
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.
NEW QUESTION # 17
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> no-license
- B. From the CLI with command tmsh load /sys ucs <ucs filename>
- 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: A
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 # 18
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/audit
- B. /var/log/secure
- C. /var/log/messages
- D. /var/log/user.log
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: 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 # 19
Which command will provide the BIG-IP Administrator with the current device HA status? (Choose one answer)
- A. list /cm failover
- B. show /cm failover-status
- C. show /sys failover
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
To determine the current failover (HA) status of a BIG-IP system using tmsh, F5 documentation explicitly states that the administrator should use the following command:
show /cm failover-status
This command displays:
The current failover state (active, standby, or offline)
Detailed failover status information
The operational HA condition of the device within a device group
According to F5 Knowledge Base Article K08452454, the documented procedure for checking failover status is:
Log in to the TMOS Shell (tmsh)
Run show /cm failover-status
Why the other options are incorrect:
A . list /cm failover shows configuration settings, not operational HA status.
B . show /sys failover is not the documented command for checking current failover status and does not align with F5's recommended procedure.
NEW QUESTION # 20
Which BIG-IP menu path provides a centralized real-time graphical view of overall system CPU, memory, connections, throughput and general performance health?
- A. Device Management > Overview
- B. Network > Interfaces
- C. Statistics > Dashboard
- D. Local Traffic > Virtual Servers
Answer: C
Explanation:
The Statistics Dashboard is the primary graphical interface used by administrators to monitor the real-time performance and health of the BIG-IP system.
* System-Wide Overview: Navigating to Statistics > Dashboard provides a centralized view of critical system-level metrics, including global CPU utilization (across all TMM instances and the Linux host) and total memory usage.
* Performance Tracking: In addition to CPU and memory, the dashboard displays other vital statistics such as total active connections, throughput (bits/packets per second), SSL transactions per second (TPS), and compression efficiency.
* Operational Health: Monitoring these metrics from the dashboard allows the administrator to quickly identify performance trends or resource exhaustion that could impact the Control Plane or Data Plane stability.
* Comparison to Other Menus:
* Local Traffic > Virtual Servers: Provides statistics specific to traffic objects rather than global system resources.
* Network > Interfaces: Shows physical layer statistics like link status, errors, and drops for specific ports.
* Device Management > Overview: Focuses on high availability (HA) states, synchronization status, and device trust rather than granular performance metrics.
NEW QUESTION # 21
The BIG-IP Administrator has modified an iRule on one device of an HA pair. The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into. What should the BIG-IP Administrator do to verify if the iRule works correctly?
- A. Pull configuration to this device to the cluster and start to monitor traffic on this device
- B. Push configuration from this device to the group and start to monitor traffic on this device
- C. Log in to the other device in the cluster, push configuration from it, and start to monitor traffic on that device
- D. Log in to the other device in the cluster, pull configuration to it, and start to monitor traffic on that device
Answer: D
Explanation:
In an Active/Standby HA pair, application traffic only flows through the Active device. If an administrator makes a change on the Standby device (which has no traffic), they must synchronize the configuration to the Active device to test it. The procedural step is to log into the Active device and "pull" the configuration from the Standby device (or push from Standby) so the Active device can process traffic using the new iRule
NEW QUESTION # 22
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/pam/tallylog
- D. /var/log/httpd
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 # 23
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/secure
- C. /var/log/messages
- D. /var/log/user.log
Answer: B
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 # 24
What is the role of TMM (Traffic Management Microkernel)?
- A. Provides GUI access
- B. Processes application traffic
- C. Stores configuration files
- D. Handles authentication
Answer: B
Explanation:
TMM runs in the data plane and is responsible for high-performance packet processing.
NEW QUESTION # 25
A BIG-IP Administrator needs to determine who changed a Virtual Server configuration.
In which log file would the BIG-IP Administrator find this data? (Choose one answer)
- A. /var/log/audit
- B. /var/log/secure
- C. /var/log/ltm
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
The audit log (/var/log/audit) records configuration changes made on the BIG-IP system, including:
Who made the change (user account)
What was changed (for example, a virtual server modification)
When the change occurred
How it was performed (GUI, TMSH, or API)
Why the other options are incorrect:
/var/log/secure logs authentication events such as login successes and failures, not configuration changes.
/var/log/ltm logs traffic-management and runtime LTM events, not administrative configuration modifications.
Therefore, the correct log file for tracking who changed a virtual server is /var/log/audit.
NEW QUESTION # 26
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/ltm
- B. /var/log/secure
- C. /var/log/audit
- D. /var/log/monitors
Answer: A
Explanation:
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.
NEW QUESTION # 27
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