[Aug 25, 2026] F5CAB4 Exam Dumps PDF Guaranteed Success with Accurate & Updated Questions
Pass F5CAB4 Exam - Real Test Engine PDF with 73 Questions
NEW QUESTION # 40
A BIG-IP Administrator is unable to connect to the management interface via HTTPS. What is a possible reason for this issue?
- A. The port lockdown setting is configured to Allow None.
- B. The IP address of the device used to access the management interface is NOT included in the "P Allow" list in the Configuration Utility.
- C. An incorrect management route is specified.
- D. The IP address of the device used to access the management interface is NOT included in the
"httpd Allow" list in the CLI.
Answer: D
Explanation:
Management connectivity is protected by an allowed access list for the httpd daemon. Unlike TMM data ports which use 'Port Lockdown' settings, the management port's access is controlled by a specific 'Allow' list. If an administrator's IP is not explicitly included in this list, the Control Plane will reject HTTPS connection attempts to the management utility.
NEW QUESTION # 41
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?
- A. Remove the decommissioned device from the device group
- B. Make sure all members of the device group are in sync
- C. Disable the device group
- D. Remove all members from the device group
Answer: D
Explanation:
To maintain integrity in a High Availability environment, TMOS prevents the deletion of active Devic28e Groups. Procedurally, a device group is a container for synchronization; the Control Plane requires that you first strip the group of all associated members (devices) before the group object itself can be removed from the configuration.
NEW QUESTION # 42
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?
- A. In the TMOS Shell Command line
- B. In the Configuration Utility, Network > Interface
- C. On the Front Console
- D. In the Configuration Utility, System > Configuration
Answer: B
Explanation:
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 # 43
Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the BIG-IP Configuration Utility? (Choose one answer)
- A. /var/log/pam/tallylog
- B. /var/log/ltm
- C. /var/log/httpd
- D. /var/log/secure
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems, all authentication attempts for administrative access-including logins to the Configuration Utility (GUI)-are logged in /var/log/secure. This log file records:
Successful and failed login attempts
The username used
The authentication method (local, LDAP, RADIUS, etc.)
Access denials and PAM authentication errors
Why the other options are incorrect:
/var/log/pam/tallylog tracks account lockouts and failed attempt counters, not detailed login attempts.
/var/log/ltm logs traffic management events, not administrative authentication.
/var/log/httpd logs web server activity but does not record authentication success or failure for BIG-IP administrative users.
Therefore, the correct log file to verify whether a user attempted to log in to the BIG-IP Configuration Utility is /var/log/secure.
NEW QUESTION # 44
A BIG-IP Administrator needs to export system configuration for migration purposes. Which file type should be used?
- A. UCS
- B. SCF
- C. QKView
- D. ISO
Answer: A
Explanation:
In F5 TMOS, a User Configuration Set (UCS) is the standard archive format used for backing up and migrating a complete system configuration .
Composition: A UCS file contains all necessary configuration data, including system-specific files, license information, SSL certificates, private keys, and local user accounts.
Procedural Use: When migrating to new hardware or performing an RMA replacement, the UCS file is the primary tool used to restore the entire Control Plane state to the new device.
Restoration: It can be managed through the Configuration Utility under System > Archives or via the CLI using the tmsh load /sys ucs command
NEW QUESTION # 45
A BIG-IP Administrator needs to determine who changed a Virtual Server configuration. In which log file would the BIG-IP Administrator find this data? (Choose one answer)
- A. /var/log/ltm
- B. /var/log/audit
- C. /var/log/secure
Answer: B
Explanation:
The audit log (/var/log/audit) records configuration changes made on the BIG-IP system, including:
Who made the change (user account)
What was changed (for example, a virtual server modification)
When the change occurred
How it was performed (GUI, TMSH, or API)
NEW QUESTION # 46
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/ltm
- B. /var/log/messages
- C. /var/log/audit
- D. /var/log/secure
Answer: D
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
NEW QUESTION # 47
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?
- A. Configure MAC Masquerade
- B. Set up Failover Method to HA Order
- C. Configure a global SNAT Listener
- D. Enable Failover Multicast Configuration
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 # 48
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. sshd
- B. httpd
- C. bd
- D. tmm
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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 # 49
In the BIG-IP Configuration Utility, where can an administrator go to view a real-time, graphical overview of system performance, including CPU usage, memory utilization, and network throughput?
- A. Device Management > Overview
- B. Network > Interfaces
- C. Statistics > Dashboard
- D. Local Traffic > Virtual Servers
Answer: C
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 # 50
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. Device Management > Traffic Groups
- C. Device Management > Devices
- D. Local Traffic > Virtual Servers
Answer: D
Explanation:
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.
NEW QUESTION # 51
Which feature ensures configuration consistency between devices?
- A. SNAT
- B. Device Service Clustering (DSC)
- C. Route domains
- D. VLAN tagging
Answer: B
Explanation:
DSC enables config sync and failover between BIG-IP devices.
NEW QUESTION # 52
The BIG-IP appliance fails to boot. The BIG-IP Administrator needs to run the End User Diagnostics (EUD) utility to collect data to send to F5 Support. Where can the BIG-IP Administrator access this utility?
- A. Internal VLAN interface
- B. Management Port
- C. Console Port
- D. External VLAN interface
Answer: C
Explanation:
The EUD is a 33hardware-level diagnostic tool that runs outside of the TMOS operating system. Because it is used when the system cannot boot or is in a pre-boot state, it cannot be accessed via the GUI or management network. The administrator must connect physically via the serial Console Port to interact with the boot menu and initiate the hardware tests.
NEW QUESTION # 53
An LTM device has a virtual server mapped to www.f5.com. Users report that when they connect to /resources/201.1.2h.l_l.com they are unable to receive content. What is the likely cause of the issue?
- A. The pool associated with the virtual server does not have priority group activation enabled.
- B. The virtual address does not have ARP enabled.
- C. The pool associated with the virtual server is falling its health check.
- D. The virtual address does not have route advertising enabled.
Answer: B
Explanation:
The Control Plane is responsible for ARP (Address Resolution Protocol) management for Virtual Addresses. For a Virtual Server to be reachable, the BIG-IP must respond to ARP requests for that IP. If the "ARP" setting is disabled on the Virtual Address properties, upstream routers cannot resolve the MAC address of the BIG-IP, leading to connectivity failure even if the service itself is
"Available."
NEW QUESTION # 54
A BIG-IP Administrator is unable to connect to the management interface via HTTPS. What is a possible reason for this issue?
- A. The port lockdown setting is configured to Allow None.
- B. The IP address of the device used to access the management interface is NOT included in the " P Allow
" list in the Configuration Utility. - C. An incorrect management route is specified.
- D. The IP address of the device used to access the management interface is NOT included in the " httpd Allow " list in the CLI.
Answer: D
Explanation:
Management connectivity is protected by an allowed access list for the httpd daemon. Unlike TMM data ports which use ' Port Lockdown ' settings, the management port ' s access is controlled by a specific ' Allow ' list.
If an administrator ' s IP is not explicitly included in this list, the Control Plane will reject HTTPS connection attempts to the management utility.
NEW QUESTION # 55
An organization is performing a major release upgrade to its BIG-IP system. The system is under medium load and has enough disk space to perform the upgrade. Which pre-upgrade task is disruptive to regular system performance and should be performed during a maintenance window? (Choose one answer)
- A. Reactivate the license
- B. Create a QKView
- C. tmsh save sys config
- D. Generate a UCS
Answer: A
Explanation:
Reactivating a BIG-IP license is a traffic-disruptive operation. During the license reactivation process, the BIG-IP system performs a configuration reload, which results in a temporary interruption of all traffic processing. Because traffic handling is affected, F5 explicitly recommends scheduling license updates during a maintenance window.
This behavior is documented in F5 Knowledge Base articles, which state that license reactivation impacts traffic and must be planned accordingly during upgrades or system changes.
NEW QUESTION # 56
A BIG-IP Administrator needs to export system configuration for migration purposes. Which file type should be used?
- A. UCS
- B. SCF
- C. QKView
- D. ISO
Answer: A
Explanation:
In F5 TMOS, a User Configuration Set (UCS) is the standard archive format used for backing up and migrating a complete system configuration .
* Composition: A UCS file contains all necessary configuration data, including system-specific files, license information, SSL certificates, private keys, and local user accounts.
* Procedural Use: When migrating to new hardware or performing an RMA replacement, the UCS file is the primary tool used to restore the entire Control Plane state to the new device.
* Restoration: It can be managed through the Configuration Utility under System > Archives or via the CLI using the tmsh load /sys ucs command The correct location to restrict management access to specific subnets is D. System > Platform1.
NEW QUESTION # 57
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. Next Active Load factor is 0 on bigip1.local
- B. Both devices are standby
- C. Next Active Load factor is 1 on bigip1.local
- D. Time Delta to local system is
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 # 58
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?
- A. /var/log/ltm
- B. /var/log/kern.log
- C. /var/log/daemon.log
- D. /var/log/audit
Answer: A
Explanation:
Although /var/log/ltm is primarily associated with Local Traffic Manager events, it is also the primary destination for system-level alerts generated by the Control Plane's chmand (Chassis Manager Daemon). Hardware status changes, including power supply failures, fan speeds, and temperature warnings, are logged as "notice" or "critical" events within the LTM log file.
NEW QUESTION # 59
In a Palo Alto Networks firewall HA pair, what happens if a configuration change is made directly on the Passive device while Auto-Sync is enabled?
- A. The change will be propagated next time a configuration change is made on the Active device.
- B. The change will be undone when Auto-Sync propagates the config to the HA pair.
- C. The change will be undone next time a configuration change is made on the Active device.
- D. The change will take effect when Auto-Sync propagates the config to the HA pair.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administratio24n Control Plane Administration documents: TMOS Device Service Cluste25ring (DSC) allows for configuration changes to be made on any device within a synchronization group. If Auto-Sync is enabled, the Control Plane detects the change on the Standby unit and automatically propagates (pushes) that updated configuration to the other members of the HA pair
NEW QUESTION # 60
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. Make sure all members of the device group are in sync
- B. Disable the device group
- C. Remove all members from the device group
- D. Remove the decommissioned device from the device group
Answer: D
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 # 61
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 > Platform
- B. System > Preferences
- C. System > Configuration
- D. System > Services
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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 # 62
Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the BIG-IP Configuration Utility? (Choose one answer)
- A. /var/log/pam/tallylog
- B. /var/log/ltm
- C. /var/log/httpd
- D. /var/log/secure
Answer: D
Explanation:
On BIG-IP systems, all authentication attempts for administrative access-including logins to the Configuration Utility (GUI)-are logged in /var/log/secure. This log file records:
* Successful and failed login attempts
* The username used
* The authentication method (local, LDAP, RADIUS, etc.)
* Access denials and PAM authentication errors
Why the other options are incorrect:
* /var/log/pam/tallylog tracks account lockouts and failed attempt counters, not detailed login attempts.
* /var/log/ltm logs traffic management events, not administrative authentication.
* /var/log/httpd logs web server activity but does not record authentication success or failure for BIG-IP administrative users.
Therefore, the correct log file to verify whether a user attempted to log in to the BIG-IP Configuration Utility is /var/log/secure.
NEW QUESTION # 63
......
F5 F5CAB4 Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
| Topic 7 |
|
Get New F5CAB4 Certification Practice Test Questions Exam Dumps: https://examsboost.dumpstorrent.com/F5CAB4-exam-prep.html