F5CAB4試験の準備方法｜100％合格率のF5CAB4過去問題試験｜完璧なBIG-IP Administration Control Plane Administration技術問題

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F5 F5CAB4 Exam Syllabus Topics:

Section	Objectives
Control Plane Fundamentals	- System management concepts 1. Device management connectivity 2. Device status interpretation - High availability operations 1. HA pair state management 2. Failover concepts
Monitoring and Troubleshooting Basics	- Logging and diagnostics 1. Event and hardware issue analysis 2. Key system logs identification
System Administration and Operations	- Configuration management 1. UCS archive creation, restore, and management 2. Config sync concepts and usage - Authentication and system services 1. System services configuration basics 2. Authentication methods overview
Maintenance and Lifecycle Operations	- Upgrades and updates 1. Upgrade eligibility assessment 2. Software upgrade procedures

>> F5CAB4過去問題 <<

F5CAB4技術問題、F5CAB4 PDF

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F5 BIG-IP Administration Control Plane Administration 認定 F5CAB4 試験問題 (Q35-Q40):

質問 # 35
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)

A. /var/log/audit
B. /var/log/messages
C. /var/log/ltm
D. /var/log/secure

正解：D

解説：
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.

質問 # 36
A BIG-IP Administrator uses a device group to share the workload and needs to perform service on a BIG-IP device currently active for a traffic group. The administrator needs to enable the traffic group to run on another BIG-IP device in the device group.
What should the administrator do to meet the requirement? (Choose one answer)

A. Create a new Traffic Group and then fail to Standby Unit
B. Select Traffic Group and then select Failover
C. Select Traffic Group on Primary Unit and then select Demote
D. Select Traffic Group and then select Force to Standby

正解：B

解説：
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
Traffic Groups are the mechanism BIG-IP uses to control which device owns specific application traffic in a high-availability (HA) configuration. When maintenance is required on a device that is currently active for a traffic group, the correct and recommended action is to fail over that traffic group to another device in the device group.
Failing over the traffic group moves ownership of that traffic group (and the virtual servers associated with it) to another available device without forcing the entire device into standby.
This allows targeted maintenance while minimizing impact to other traffic groups that may still be active on the device.
Why the other options are incorrect:
A is unnecessary and incorrect; traffic groups are not recreated for routine maintenance.
C forces the entire device to standby, which may move more traffic than intended.
D (Demote) affects device trust/priority behavior and is not the standard or recommended method for moving traffic group ownership.
Therefore, selecting the Traffic Group and choosing Failover is the correct solution.

質問 # 37
A BIG-IP Administrator is conducting maintenance on one BIG-IP appliance in an HA Pair. Why should the BIG-IP Administrator put the appliance into FORCED_OFFLINE state?

A. To allow new connections to Virtual Servers and ensure the appliance becomes active
B. To terminate existing connections to Virtual Servers and prevent the appliance from becoming active
C. To preserve existing connections to Virtual Servers and reduce the CPU load
D. To terminate connections to the management IP and decrease persistent connections

正解：B

解説：
Placing a device in the FORCED_OFFLINE state is a critical procedural concept for HA maintenance. Unlike simply being 'Standby', the FORCED_OFFLINE state ensures that the Control Plane will not participate in failover selection, effectively preventing the device from becoming 'Active' even if the peer fails. This state also allows the administrator to terminate existing connections to ensure no traffic is being processed during the maintenance window.

質問 # 38
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?

A. A TCP monitor with a custom interval/timeout
B. An HTTP monitor with custom send/receive strings
C. A UDP monitor with a custom interval/timeout
D. A combination of ICMP + TCP monitor

正解：B

解説：
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.

質問 # 39
Administrative user accounts have been defined on the remote LDAP server and are unable to log in to the BIG-IP device. Which log file should the BIG-IP Administrator check to find the related messages?28

A. /var/log/messages
B. /var/log/ltm
C. /var/log/user.log
D. /var/log/secure

正解：D

解説：
Comprehensive and Detailed Explanation From BIG-IP A34dministration Control Plane Administration documents: Authentication and authorization events are handled by the system's PAM (Pluggable Authentication Modules). For Control Plane security auditing, all login attempts-whether local or remote (LDAP/RADIUS/TACACS+)-and SSH-related security events are recorded in /var/log/secure. This is the primary log for troubleshooting administrative access issues

質問 # 40
......

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