F5CAB4 Certification Exam Dumps Questions in here [Oct-2026]
Updated F5CAB4 Exam Practice Test Questions
F5 F5CAB4 Exam Syllabus Topics:
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NEW QUESTION # 38
What is iControl REST used for?
- A. API-based automation and management
- B. Logging
- C. DNS resolution
- D. Traffic forwarding
Answer: A
Explanation:
iControl REST enables programmatic control of BIG-IP.
NEW QUESTION # 39
A BIG-IP Administrator is setting up a new BIG-IP device. The network administrator reports that the interface has an incompatible media speed. The BIG-IP Administrator needs to change this setting manually. From which location should the BIG-IP Administrator perform this task?14
- A. On the Front Console15
- B. In the Configuration Utility, System > Configuration18
- C. In the Configuration Utility, Network > Interface17
- D. In the TMOS Shell Command line16
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration20 Control Plane Administration documents: Connectivity management involves ensuring that the physical layer matches the networking environment. Interface properties, including media speed, duplex settings, and MTU, are managed at the Control Plane level under the Network menu. To resolve a mismatch with an upstream switch, the administrator must navigate to Network > Interfaces to manually override auto-negotiation settings.
NEW QUESTION # 40
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/ltm
- C. /var/log/secure
- D. /var/log/messages
Answer: C
Explanation:
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.
NEW QUESTION # 41
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status?
- A. /var/log/audit
- B. /var/log/monitors
- C. /var/log/ltm
- D. /var/log/lastlog
Answer: C
Explanation:
Monitoring and reporting current device status involves tracking the health of traffic objects like Virtual Servers. 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 file. While the audit log tracks who changed a configuration, the LTM log tracks system-initiated status changes.
NEW QUESTION # 42
A BIG-IP Administrator needs to check the memory utilization on a BIG-IP system. Which two methods can the BIG-IP Administrator use? (Choose two.)
- A. Run the tmsh show /sys memory command
- B. Go to Statistics > Module Statistics > Memory in the configuration utility
- C. Run the tmsh show /sys traffic command
- D. Go to Statistics > Module Statistics > Traffic Summary in the configuration utility
Answer: A,B
Explanation:
Reporting device status includes monitoring physical resource exhaustion, such as memory. The Control Plane provides both a command-line method via TMSH (show /sys memory) and a graphical method under Statistics > Module Statistics > Memory to report on how memory is allocated across TMM and the Linux host. This is essential for identifying potential "Aggressive Mode" triggers or hardware performance bottlenecks.
NEW QUESTION # 43
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 terminate existing connections to Virtual Servers and prevent the appliance from becoming active
- B. To preserve existing connections to Virtual Servers and reduce the CPU load
- C. To allow new connections to Virtual Servers and ensure the appliance becomes active
- D. To terminate connections to the management IP and decrease persistent connections
Answer: A
Explanation:
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.
NEW QUESTION # 44
Which BIG-IP menu path provides a centralized real-time graphical view of overall system CPU, memory, connections, throughput and general performance health?
- A. Statistics > Dashboard
- B. Device Management > Overview
- C. Local Traffic > Virtual Servers
- D. Network > Interfaces
Answer: A
Explanation:
The Statistics Dashboard is the primary graphical interface used by administrators to monitor the real-time performance and health of the BIG-IP system.
* System-Wide Overview: Navigating to Statistics > Dashboard provides a centralized view of critical system-level metrics, including global CPU utilization (across all TMM instances and the Linux host) and total memory usage.
* Performance Tracking: In addition to CPU and memory, the dashboard displays other vital statistics such as total active connections, throughput (bits/packets per second), SSL transactions per second (TPS), and compression efficiency.
* Operational Health: Monitoring these metrics from the dashboard allows the administrator to quickly identify performance trends or resource exhaustion that could impact the Control Plane or Data Plane stability.
* Comparison to Other Menus:
* Local Traffic > Virtual Servers: Provides statistics specific to traffic objects rather than global system resources.
* Network > Interfaces: Shows physical layer statistics like link status, errors, and drops for specific ports.
* Device Management > Overview: Focuses on high availability (HA) states, synchronization status, and device trust rather than granular performance metrics.
NEW QUESTION # 45
Why is NTP critical in BIG-IP environments?
- A. Balances load
- B. Encrypts traffic
- C. Ensures time synchronization for logs and HA
- D. Improves throughput
Answer: C
Explanation:
Accurate time is crucial for logging, troubleshooting, and HA operations.
NEW QUESTION # 46
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)
- A. Large files on /usr file system
- B. Large files on the / file system
- C. Results from the platform diagnostics test
- D. Results from the EUD test
Answer: B
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 # 47
A user needs to generate a QKView to upload to iHealth to determine any issues with upgrading TMOS. Where can the user generate the QKView in the Configuration Utility?
- A. System > Support
- B. System > Configuration
- C. System > Archives
- D. System > Software Management
Answer: A
Explanation:
Generating a QKView is a standard procedure for identifying device health and upgrade readiness. Within the Configuration Utility, this Control Plane diagnostic tool is located under System > Support. This utility collects configuration and state data into a single file used by the iHealth 'Upgrade Advisor' to report on known bugs or compatibility issues prior to a version change.
NEW QUESTION # 48
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. Device Management > Overview
- B. Local Traffic > Virtual Servers
- C. Device Management > Devices
- D. Device Management > Traffic Groups
Answer: B
Explanation:
To re27port the current status of high availability for specific traffic, an administrator must verify the Traffic Group association28. In the Configuration Utility, Virtual Server properties include the Virtual Address settings where the 'Traffic Group' is assigned29292929. If the Virtual Address is assigned to a floating traffic group (like traffic-group-1), it is configured to fail over to the standby member30303030.
NEW QUESTION # 49
A BIG-IP Administrator needs to check the memory utilization on a BIG-IP system. Which two methods can the BIG-IP Administrator use? (Choose two.)
- A. Run the tmsh show /sys memory command
- B. Go to Statistics > Module Statistics > Memory in the configuration utility
- C. Run the tmsh show /sys traffic command
- D. Go to Statistics > Module Statistics > Traffic Summary in the configuration utility
Answer: A,B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Reporting device status includes monitoring physical resource exhaustion, such as memory48. The Control Plane provides both a command-line method via TMSH (show /sys memory) and a graphical method under Statistics > Module Statistics > Memory to report on how memory is allocated across TMM and the Linux host494949494949494949. This is essential for identifying potential "Aggressive Mode" triggers or hardware performance bottlenecks50.
NEW QUESTION # 50
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/ltm
- C. /var/log/secure
- D. /var/log/messages
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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.
NEW QUESTION # 51
A BIG-IP device sends out the following SNMP trap: big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN. Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?
- A. Network > Interfaces > Interface List
- B. Statistics > Performance > System
- C. System > Platform
- D. Network > Trunks > Trunk List
Answer: A
Explanation:
Comprehensive and Detailed Explan13ation From BIG-IP Administration Control Plane Administration documents: Monitoring the physical status of the device is critical for reporting device health. In F5 nomenclature, "1.0", "1.1", etc., represent physical hardware interfaces. To verify if a physical link is up or down as reported by the Control Plane's SNMP agent, the administrator must check the Interface List located under Network > Interfaces
NEW QUESTION # 52
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 standby
- B. Active BIG-IP: Configuration Utility > Device Management > Devices > Local Device (Self) > Force to Standby
- C. Active BIG-IP: CLI > tmsh run /sys failover device standby
- D. Active BIG-IP: Configuration Utility > Device Management > Traffic Groups > Local Device (Self) > Force to Standby
Answer: B,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 # 53
In which of the following log files would log events pertaining to pool members being marked "UP" or "DOWN" by their Health Monitors be written? (Choose one answer)
- A. /var/log/audit
- B. /var/log/monitors
- C. /var/log/ltm
- D. /var/log/secure
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems, Local Traffic Manager (LTM) is responsible for:
Pool and pool member management
Health monitor execution
Marking pool members UP or DOWN based on monitor results
Events related to health monitor status changes, including when pool members transition between UP and DOWN, are logged in /var/log/ltm.
Why the other options are incorrect:
/var/log/audit records administrative configuration changes, not runtime health status.
/var/log/secure logs authentication and authorization events.
/var/log/monitors is not a standard BIG-IP log file.
Therefore, the correct log file for pool member health monitor status events is /var/log/ltm.
NEW QUESTION # 54
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
Answer: D
Explanation:
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
NEW QUESTION # 55
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