Tested Material Used To F5CAB4 Test Engine Exam Questions in here [Mar-2026]
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NEW QUESTION # 28
A BIG-IP Administrator discovers malicious brute-force attempts to access the BIG-IP device on the management interface via SSH. The BIG-IP Administrator needs to restrict SSH access to the management interface. Where should this be accomplished?
- A. Network > Interfaces
- B. System > Platform
- C. Network > Self IPs
- D. System > Configuration
Answer: B
Explanation:
The "Management Port" is distinct from TMM data ports. Configuration for global platform-level settings, including administrative access restrictions (IP Allow lists for SSH and HTTPS) for the management port, is found under System > Platform. This is a critical Control Plane hardening step to prevent unauthorized remote access Here is the next batch of 10 questions from your document that are 100% related to BIG-IP
NEW QUESTION # 29
As an organization grows, more people have to log into the BIG-IP. Instead of adding more local users, the BIG-IP Administrator is asked to configure remote authentication against a central authentication server.
Which two types of remote server can be used here? (Choose two answers)
- A. RADIUS
- B. OAUTH
- C. LDAP
- D. SAML
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
BIG-IP supports remote authentication by integrating with centralized authentication services through its AAA framework. The supported and commonly used remote authentication servers include:
LDAP (A)
Used to authenticate users against directory services such as Active Directory or other LDAP-compliant directories.
RADIUS (C)
Commonly used for centralized authentication, authorization, and accounting, especially in network and security environments.
Why the other options are incorrect:
OAUTH (B) is an authorization framework, not supported as a direct administrative authentication backend for BIG-IP management access.
SAML (D) is primarily used for single sign-on (SSO) in application authentication scenarios, not for BIG-IP administrative login authentication.
Thus, the correct remote authentication server types are LDAP and RADIUS.
NEW QUESTION # 30
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/ltm
- B. /var/log/secure
- C. /var/log/user.log
- D. /var/log/messages
Answer: B
Explanation:
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
NEW QUESTION # 31
One of the two members of a device group has been decommissioned. The BIG-IP Administrator tries to delete the device group, but is unsuccessful.
Prior to removing the device group, which action should be performed? (Choose one answer)
- A. Remove the decommissioned device from the device group
- B. Disable the device group
- C. Remove all members from the device group
- D. Make sure all members of the device group are in sync
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
A BIG-IP device group cannot be deleted if it still contains device members, even if one of those devices has already been decommissioned or is unreachable. Before deleting the device group, the administrator must explicitly remove the decommissioned device from the device group configuration.
Once the removed or unreachable device is deleted from the device group membership, the BIG-IP system allows the remaining administrator to successfully delete the device group.
Why the other options are incorrect:
A . Remove all members from the device group
This is not required; the key requirement is removing the decommissioned device, not all members.
B . Make sure all members are in sync
Synchronization status does not prevent device group deletion.
D . Disable the device group
Device groups cannot be disabled; they must be modified or deleted.
Therefore, the correct prerequisite action is to remove the decommissioned device from the device group, making C the correct answer.
NEW QUESTION # 32
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
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Con10trol Plane Administration documents: Placing a device in the FORCED_OFFLINE state is a critical procedural concept for HA maintenance111213. 1415Unlike simply being 'Standby16', the FORCED_OFFLINE state ensures tha17t the Control Plane will not participate in failover selection, effectively preventing the device from becoming 'Active' even if the peer fails18. This state also allows the administrator to terminate existing connections to ensure no traffic is being processed during the maintenance window19.
NEW QUESTION # 33
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. Select Traffic Group on Primary Unit and then select Demote
- B. Select Traffic Group and then select Force to Standby
- C. Create a new Traffic Group and then fail to Standby Unit
- D. Select Traffic Group and then select Failover
Answer: D
Explanation:
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.
NEW QUESTION # 34
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?
- A. Force active member of device group to standby
- B. Synchronize the standby member configuration to the group
- C. Activate device with the most recent configuration
- D. Synchronize the active member configuration to the group.
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: 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 # 35
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 > Archives
- B. System > Support
- C. System > Software Management
- D. System > Configuration
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Generating a QKView is a standard procedure for identifying device health and upgrade readiness42. Within the Configuration Utility, this Control Plane diagnostic tool is located under System > Support43. 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 # 36
When looking at this BIG-IP prompt: root@virtual-bigip1] Peer Time Out of Sync What does the message indicate? (Choose one answer)
- A. That there was a time synchronization issue between the BIG-IP device and its peer
- B. That the local time is correct, but the remote time is incorrect
- C. That the peer BIG-IP is unreachable for the device group
- D. That one of the NTP sources has a skewed clock
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems that participate in a Device Service Cluster (DSC), each device compares the remote device's system time to its own system time. If the difference is outside the ConfigSync time threshold (commonly referenced as 3 seconds by default), BIG-IP updates the shell prompt to show "Peer Time Out of Sync", and ConfigSync operations may fail until time is corrected (typically by fixing NTP reachability/configuration, or in some cases adjusting the threshold). (cdn.studio.f5.com) This message is specifically about time drift between peers in the trust domain/DSC-not basic reachability (so B is not what it means), and it does not prove which side is "correct" (so C is too specific). It also doesn't directly mean an NTP source is "skewed" (A can be a cause, but the prompt message itself indicates the peer-to-peer time mismatch condition). (cdn.studio.f5.com)
NEW QUESTION # 37
A BIG-IP Administrator runs the initial configuration wizard and learns that the NTP servers were invalid.
In which area of the Configuration Utility should the BIG-IP Administrator update the list of configured NTP servers? (Choose one answer)
- A. System > Services
- B. System > Configuration
- C. System > Platform
- D. System > Preferences
Answer: B
Explanation:
On a BIG-IP system, NTP (Network Time Protocol) configuration is part of the system-level configuration settings. In the Configuration Utility, NTP servers are configured under the System configuration hierarchy.
The correct navigation path is:
System > Configuration > Device > NTP
This location allows the administrator to:
* Add, modify, or remove NTP servers
* Ensure accurate system time synchronization
* Maintain proper time alignment required for features such as ConfigSync, HA failover, logging, and certificate validation Why the other options are incorrect:
* A. System > Platform is used for hardware-related settings.
* B. System > Preferences manages UI and user preferences.
* C. System > Services controls system daemons and services, not time configuration.
Therefore, the correct answer is D. System > Configuration.
NEW QUESTION # 38
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 > Trunks > Trunk List
- B. Network > Interfaces > Interface List
- C. System > Platform
- D. Statistics > Performance > System
Answer: B
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 # 39
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?
(Choose one answer)
- A. Local Traffic > Policies
- B. System > Archives
- C. Local Traffic > Virtual Servers
- D. System > Configuration
Answer: B
Explanation:
In the BIG-IP Configuration Utility, all system backup and restore operations-including UCS (User Configuration Set) file restoration-are performed from the Archives section.
The correct navigation path is:
System > Archives
From this location, the administrator can:
* Upload UCS files
* Restore UCS backups
* Manage system archive files used for backup and recovery
Why the other options are incorrect:
* A. System > Configuration is used for general system settings, not backup restoration.
* C. Local Traffic > Virtual Servers is used for application traffic objects.
* D. Local Traffic > Policies manages traffic policies, not system backups.
Therefore, the correct section to restore a UCS file using the Configuration Utility is System > Archives.
NEW QUESTION # 40
A BIG-IP Administrator needs to update the list of configured NTP servers. In which area of the Configuration Utility should the BIG-IP Administrator perform this update?
- A. System > Services
- B. System > Configuration
- C. System > Platform
- D. System > Preferences
Answer: B
Explanation:
NTP (Network Time Protocol) is vital for management connectivity and HA state synchronization. Correct time is required for log timestamping and device trust group communication46. To manage these settings, the administrator navigates to System > Configuration, where general system-level services like NTP and DNS are defined to ensure the Control Plane remains synchronized with the network environment.
NEW QUESTION # 41
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 > Overview36
- B. Local Traffic > Virtual Servers35
- C. Device Management > Traffic Groups
- D. Device Management > Devices34
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration do38cuments: While HA state is managed under "Device Management," the specific failover behavior of a traffic object is linked to its configuration. A Virtual Address must be associated with a "Traffic Group" (usually traffic-group-1) to fail over. This association and the resulting floating status can be verified by viewing the Virtual Server or Virtual Address list under Local Traffic > Virtual Servers.
NEW QUESTION # 42
The BIG-IP system is provisioned for LTM only. The BIG-IP Administrator is tasked with provisioning ASM.
What process restarts when the BIG-IP Administrator changes the module provisioning? (Choose one answer)
- A. httpd
- B. tmm
- C. sshd
- D. bd
Answer: B
Explanation:
When a BIG-IP Administrator changes module provisioning (for example, enabling ASM on a system previously provisioned only for LTM), the BIG-IP system must restart the Traffic Management Microkernel (TMM) process.
The TMM process is responsible for:
* Traffic handling
* LTM, ASM, and other traffic-processing modules
* Enforcing security and application policies
Provisioning changes affect how traffic modules are loaded and integrated into TMM. As a result, TMM is restarted, which causes a temporary interruption of traffic processing. This is expected behavior and is why module provisioning changes should be planned during a maintenance window.
Why the other options are incorrect:
* A. bd is related to blade/platform management, not module provisioning.
* C. sshd handles SSH access and is not affected by provisioning changes.
* D. httpd supports the Configuration Utility (GUI) and does not restart due to module provisioning.
Therefore, the correct answer is B. tmm.
NEW QUESTION # 43
The BIG-IP Administrator runs the command:
netstat -an | grep 443
and sees the following output:
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
What does this output indicate about the service on port 443? (Choose one answer)
- A. The service is actively listening only on the loopback interface.
- B. The service is actively listening on all interfaces for HTTPS traffic.
- C. The service is in a standby state and unable to accept connections.
- D. The service indicates no connections to the LISTEN port.
Answer: B
Explanation:
In netstat output:
* 0.0.0.0:443 means the service is bound to all available IPv4 interfaces on the system.
* LISTEN indicates the service is actively waiting for incoming connection requests.
Therefore, this output confirms that a service (commonly HTTPS/443, such as the BIG-IP Configuration Utility or an application listener) is actively listening on all interfaces, making B the correct answer.
Why the other options are incorrect:
* A would show 127.0.0.1:443 if it were loopback-only.
* C is incorrect because LISTEN explicitly indicates readiness to accept connections.
* D is unrelated; standby state does not affect socket binding shown by netstat.
Hence, the correct answer is B.
NEW QUESTION # 44
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? (Choose one answer)
- A. Local Traffic > Policies
- B. System > Archives
- C. Local Traffic > Virtual Servers
- D. System > Configuration
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
In the BIG-IP Configuration Utility, all system backup and restore operations-including UCS (User Configuration Set) file restoration-are performed from the Archives section.
The correct navigation path is:
System > Archives
From this location, the administrator can:
Upload UCS files
Restore UCS backups
Manage system archive files used for backup and recovery
Why the other options are incorrect:
A . System > Configuration is used for general system settings, not backup restoration.
C . Local Traffic > Virtual Servers is used for application traffic objects.
D . Local Traffic > Policies manages traffic policies, not system backups.
Therefore, the correct section to restore a UCS file using the Configuration Utility is System > Archives.
NEW QUESTION # 45
Which command will provide the BIG-IP Administrator with the current device HA status? (Choose one answer)
- A. list /cm failover
- B. show /cm failover-status
- C. show /sys failover
Answer: B
Explanation:
To determine the current failover (HA) status of a BIG-IP system using tmsh, F5 documentation explicitly states that the administrator should use the following command:
show /cm failover-status
This command displays:
The current failover state (active, standby, or offline)
Detailed failover status information
The operational HA condition of the device within a device group
According to F5 Knowledge Base Article K08452454, the documented procedure for checking failover status is:
Log in to the TMOS Shell (tmsh)
Run show /cm failover-status
Why the other options are incorrect:
A). list /cm failover shows configuration settings, not operational HA status.
B). show /sys failover is not the documented command for checking current failover status and does not align with F5's recommended procedure.
NEW QUESTION # 46
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