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F5 F5CAB4 Exam Syllabus Topics:

SectionObjectives
Device Maintenance- License Management
- Software Upgrades
- Hotfix Installation
System Services- DNS Management
- SNMP Configuration
- NTP Configuration
System Management & Backups- UCS Archive Management
- Restore Procedures
- Private Key Handling
High Availability (HA) Operations- Configuration Synchronization (ConfigSync)
- Device Trust Status
- Failover Operations
Authentication & Security- Local Authentication
- Remote Authentication (LDAP/RADIUS)
- System Security Configuration
Logging & Troubleshooting- System State Analysis
- Log File Interpretation (/var/log)
- Control Plane Fault Isolation

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F5 BIG-IP Administration Control Plane Administration Sample Questions (Q12-Q17):

NEW QUESTION # 12
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)

Answer: D

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


NEW QUESTION # 13
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)

Answer: A

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 # 14
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?

Answer: C

Explanation:
TMOS Device Service Clustering (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 # 15
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)

Answer: C

Explanation:
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 # 16
What is iControl REST used for?

Answer: B

Explanation:
iControl REST enables programmatic control of BIG-IP.


NEW QUESTION # 17
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