The BIG-IP Administration Control Plane Administration (F5CAB4) exam (F5CAB4)
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F5CAB4 Exam Dumps
- Exam Code: F5CAB4
- Vendor: F5
- Certifications: F5-CA
- Exam Name: BIG-IP Administration Control Plane Administration (F5CAB4) exam
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F5 F5CAB4 Exam Domains Q&A
Certified instructors verify every question for 100% accuracy, providing detailed, step-by-step explanations for each.
Question 1
F5 F5CAB4
QUESTION DESCRIPTION:
The BIG-IP Administrator suspects unauthorized SSH login attempts on the BIG-IP system.
Which log file would contain details of these attempts? (Choose one answer)
Correct Answer & Rationale:
Answer: B
Explanation:
On BIG-IP systems, authentication and authorization events are logged in /var/log/secure . This includes:
Successful and failed SSH login attempts
Invalid user authentication attempts
PAM (Pluggable Authentication Module) authentication failures
Access denials related to secure services
Why the other options are incorrect:
/var/log/messages contains general system messages and service events, not detailed authentication failures.
/var/log/audit records administrative configuration changes (who changed what and when), not login attempts.
/var/log/ltm logs traffic-management (TMM) and application-related events.
Therefore, the correct log file for investigating unauthorized SSH login attempts is /var/log/secure .
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Question 2
F5 F5CAB4
QUESTION DESCRIPTION:
A BIG-IP Administrator needs to check the memory utilization on a BIG-IP system. Which two methods can the BIG-IP Administrator use? (Choose two.)
Correct Answer & Rationale:
Answer: A, D
Explanation:
Reporting device status includes monitoring physical resource exhaustion, such as memory. 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 host 494949494949494949 . This is essential for identifying potential " Aggressive Mode " triggers or hardware performance bottlenecks 50 .
Question 3
F5 F5CAB4
QUESTION DESCRIPTION:
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?
Correct Answer & Rationale:
Answer: C
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.
Question 4
F5 F5CAB4
QUESTION DESCRIPTION:
Refer to the exhibit.
What is the status of bigip1.com ?
Correct Answer & Rationale:
Answer: A
Explanation:
The status icon shown for bigip1.com (Self) indicates that the device is in a forced offline condition. In BIG-IP high availability management, device state is reported through the Device Management interface, and the icon in the Status column is used to quickly identify whether a device is active, standby, offline, or forced offline. A green status indication is normally associated with an available/active operational state, while the icon shown beside bigip1.com reflects that the local device is not participating normally in traffic processing or failover. Standby would indicate the device is available as a failover peer but not currently processing the active traffic group. Active would indicate the device currently owns the traffic group and is processing traffic. Because the displayed status icon for bigip1.com represents the administratively forced offline state, the correct answer is A. Force Offline .
Question 5
F5 F5CAB4
QUESTION DESCRIPTION:
Refer to the exhibit.
The BIG-IP Administrator runs the command shown and observes a device trust issue between BIG-IP devices in a device group. The issue prevents config sync on device bigip3.local. What is preventing the config sync?
Correct Answer & Rationale:
Answer: D
Explanation:
Maintaining an accurate and synchronized clock across all members of a device group is a fundamental requir5ement for the BIG-IP Control P6lane to establis7h and maintain device tru8st9.
Time Delta Impact : As shown in the exhibit, the " Time Delta to Local Device (sec) " is 12 .
Trust Mechanism : Device trust relies on secure certificate-based communication (SSL/TLS) . If the time difference between devices is too large (typically more than a few seconds), the Control Plane cannot validate the certificates, leading to a failure in the trust relationship .
ConfigSync Failure : When device trust is broken due to time drift, the systems cannot verify the identity of the peer, which directly prevents the ConfigSync process from executing on the affected device, such as bigip3.local in this scenario.
Resolution : Administrators must ensure that all devices in a high availability pair are configured to use the same reliable NTP servers to keep their system clocks aligned.
The correct command for restoring an encrypted UCS archive via the command line is D. load /sys ucs <</b> filepath > passphrase <</b> password > .
Question 6
F5 F5CAB4
QUESTION DESCRIPTION:
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?
Correct Answer & Rationale:
Answer: C
Explanation:
To re 27 port the current status of high availability for specific traffic, an administrator must verify the Traffic Group association 28 . In the Configuration Utility, Virtual Server properties include the Virtual Address settings where the ' Traffic Group ' is assigned 29292929 . If the Virtual Address is assigned to a floating traffic group (like traffic-group-1), it is configured to fail over to the standby member 30303030 .
Question 7
F5 F5CAB4
QUESTION DESCRIPTION:
A node is a member of various pools and hosts different web applications. If a web application is unavailable, the BIG-IP appliance needs to mark the pool member down for that application pool. What should a BIG-IP Administrator deploy at the pool level to accomplish this?
Correct Answer & Rationale:
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Admi 13 nistration documents:
To accurately report the current status of specific web applications hosted on the same server (node), the Control Plane must use a monitor that operates at the application layer.
Application-Specific Monitoring : While a node (the IP address) might be up and responding to ICMP (ping) or TCP handshakes, a specific web service or path on that server could be failing.
Custom Send Strings : An HTTP monitor allows the administrator to define a " Send String " to request a specific page or URI related to the application in that pool .
Receive Strings : The " Receive String " identifies a unique value that the application must return to be considered " Available " .
Granular Status Reporting : By deploying these monitors at the pool level, the Control Plane can mark a pool member " Offline " for one application pool if the receive string is missing, while keeping it " Available " in another pool where the service is still healthy.
Question 8
F5 F5CAB4
QUESTION DESCRIPTION:
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)
Correct Answer & Rationale:
Answer: A
Explanation:
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 .
Question 9
F5 F5CAB4
QUESTION DESCRIPTION:
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)
Correct Answer & Rationale:
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 .
Question 10
F5 F5CAB4
QUESTION DESCRIPTION:
Which command will provide the BIG-IP Administrator with the current device HA status? (Choose one answer)
Correct Answer & Rationale:
Answer: C
Explanation:
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.
Verified by Certified Instructors
This F5 F5CAB4 study pack was audited and verified on August 9, 2026 by Radia Davenport,. We ensure every technical rationale aligns with real-world enterprise standards.
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