Web-based F5CAB4 Practice Test With Dumps

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F5 F5CAB4 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Given a scenario, interpret Service status: This section teaches interpreting service states, analyzing netstat output, and determining whether services are listening on specific ports.
Topic 2
  • Identify configured system services: This domain covers verifying proper configuration of essential services including DNS, NTP, SNMP, and syslog.
Topic 3
  • Apply procedural concepts required to create, manage, and restore a UCS archive: This domain covers UCS backup and restore procedures, understanding backup use cases, proper storage practices, and UCS file contents including private keys.
Topic 4
  • Identify and report current device status: This domain covers monitoring BIG-IP operational status through LCD panels, dashboards, Network Map, GUI
  • TMSH commands, and checking high availability states.
Topic 5
  • Explain config sync: This section focuses on configuration synchronization procedures, identifying sync errors, determining sync necessity, checking sync status, and comparing configuration timestamps.
Topic 6
  • List which log files could be used to find events and
  • or hardware issues: This section teaches identification of key log files (
  • var
  • log
  • ltm, secure, audit), understanding event severity levels, and interpreting log messages.

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F5 BIG-IP Administration Control Plane Administration Sample Questions (Q58-Q63):

NEW QUESTION # 58
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: 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 < filepath> passphrase <password>.


NEW QUESTION # 59
A BIG-IP Administrator needs to verify system time synchronization. Where should this be checked?

Answer: D

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 # 60
What are the recommended methods for forcing a BIG-IP system to standby mode? (Choose two answers)

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 # 61
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status?

Answer: B

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 # 62
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?

Answer: A

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 # 63
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