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F5 F5CAB4 Exam Syllabus Topics:

SectionWeightObjectives
Authentication & System Services15%- Config sync and system services
- Authentication methods and user roles
System Backup & Restore15%- Create, manage and restore UCS archives
Upgrades & Service Status10%- Interpret service status and health
- Determine upgrade eligibility
Management Connectivity & Status20%- Identify management IP, network settings and device status
Logging & Troubleshooting20%- Identify log files and usage
  • 1. /var/log/ltm, /var/log/secure, /var/log/audit
    • 2. Log levels and event analysis
      High Availability Management20%- Manage high availability pair state
      • 1. Verify failover status and device trust
        • 2. Execute force to standby/offline procedures

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          F5 BIG-IP Administration Control Plane Administration Sample Questions (Q35-Q40):

          NEW QUESTION # 35
          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)

          Answer: C

          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 # 36
          What is required to activate a BIG-IP system license?

          Answer: C

          Explanation:
          The base registration key is required to license and activate BIG-IP.


          NEW QUESTION # 37
          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?

          Answer: A

          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 # 38
          A BIG-IP Administrator reviews the Plane CPU Usage performance chart and discovers a high percentage of Control Plane utilization. Which type of traffic does this indicate a higher usage of?

          Answer: B

          Explanation:
          Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: F5 architecture distinguishes between the Data Plane (TMM processing application traffic) and the Control Plane (Linux host processing management tasks). High Control Plane CPU utilization typically points to administrative activities such as heavy GUI usage, complex API calls (iControl), large-scale configuration synchronizations, or intensive logging/monitoring tasks rather than the actual switching or load balancing of application data.


          NEW QUESTION # 39
          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?

          Answer: C

          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 < filepath> passphrase <password>.


          NEW QUESTION # 40
          ......

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