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F5 F5CAB4 認定試験の出題範囲：

トピック	出題範囲
トピック 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.
トピック 2	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.
トピック 3	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.
トピック 4	Identify management connectivity configurations: This section focuses on understanding management access configurations, including management IP addresses, port lockdown settings, remote connectivity verification, and troubleshooting access issues.
トピック 5	Explain authentication methods: This section focuses on user management including creating modifying users, configuring remote authentication providers, and implementing group-based access control.
トピック 6	Given a scenario, determine device upgrade eligibility: This domain covers determining appropriate timing for software and platform upgrades and strategies to minimize downtime during upgrades.

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F5 BIG-IP Administration Control Plane Administration 認定 F5CAB4 試験問題 (Q39-Q44):

質問 # 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?

A. Time Delta to local system is
B. Next Active Load factor is 1 on bigip1.local
C. Next Active Load factor is 0 on bigip1.local
D. Both devices are standby

正解：A

解説：
Maintaining an accurate and synchronized clock across all members of a device group is a fundamental requir5ement for the BIG-IP Control Plane to establish and maintain device trust.
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 bigip.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.

質問 # 40
A BIG-IP Administrator needs to restore a UCS file to an F5 device using the Configuration Utility. Which section of the Configuration Utility should the BIG-IP Administrator access to perform this task?

A. System > Configuration
B. Local Traffic > Policies
C. Local Traffic > Virtual Servers
D. System > Archives

正解：D

解説：
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Managing the state of a device often involves restoring configuration backups known as User Configuration Set (UCS) files These archives contain the full system configuration, including licenses and SSL certificates. The Control Plane provides a dedicated management area for these files under System > Archives, where administrators can upload, create, and restore configuration snapshots

質問 # 41
Which TMSH command initiates a manual configuration synchronization to the specified device group? (Choose one answer)

A. tmsh load sys config to-group <device_group>
B. tmsh run cm config-sync to-group <device_group>
C. tmsh modify sys failover auto-sync enable
D. tmsh run sys device-group update-config

正解：B

解説：
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
In a BIG-IP Device Service Cluster (DSC), manual configuration synchronization is performed using the ConfigSync framework. The supported and documented command to manually push the local configuration to a specific device group is:
tmsh run cm config-sync to-group <device_group>
This command:
Initiates a one-time manual ConfigSync
Pushes the local device's configuration to all members of the specified device group Is commonly used when auto-sync is disabled or when the administrator wants explicit control over synchronization timing Why the other options are incorrect:
A is not a valid TMSH command for ConfigSync.
B enables auto-sync but does not perform an immediate synchronization.
D is not a valid or supported TMSH command for device group configuration synchronization.
Therefore, the correct command to manually synchronize configuration to a device group is C.

質問 # 42
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. Local Traffic > Virtual Servers
B. Device Management > Overview
C. Device Management > Devices
D. Device Management > Traffic Groups

正解：A

解説：
To report the current status of high availability for specific traffic, an administrator must verify the Traffic Group association. In the Configuration Utility, Virtual Server properties include the Virtual Address settings where the 'Traffic Group' is assigned. 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.

質問 # 43
What are the recommended methods for forcing a BIG-IP system to standby mode? (Choose two answers)

A. Active BIG-IP: CLI > tmsh run /sys failover device standby
B. Active BIG-IP: Configuration Utility > Device Management > Devices > Local Device (Self) > Force to Standby
C. Active BIG-IP: Configuration Utility > Device Management > Traffic Groups > Local Device (Self) > Force to Standby
D. Active BIG-IP: CLI > tmsh run /sys failover standby

正解：A、B

解説：
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.

質問 # 44
......

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