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F5CAB5 Exam
F5.F5CAB5.v2026-07-18.q66 Dumps

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Question 21

Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?

A.SSL
B.Hash
C.Universal
D.Source Address Affinity

Correct Answer: D

Persistence is critical for ensuring that a client's session remains with the same pool member throughout its duration. If primary persistence (like Cookie Persistence) fails--for instance, because the client has disabled cookies--load balancing will not work as expected, and the session may be broken. A "Fallback Persistence Profile" provides a backup method. The most common and reliable fallback method is "Source Address Affinity". This method tracks the client's IP address in the BIG-IP's persistence table and ensures that any subsequent requests from that IP are routed to the same pool member, even if the primary persistence token is missing.
Troubleshooting session drops often involves checking if a fallback method is configured to handle scenarios where the primary method is unsupported by the client's browser or environment. Without a fallback, the BIG-IP would revert to standard load balancing, potentially sending the client to a different server that lacks their session data.

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Question 22

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.Management Port
B.Console Port
C.External VLAN interface
D.Internal VLAN interface

Correct Answer: B

The End User Diagnostics (EUD) utility is a hardware-level testing suite used to verify the integrity of the physical components of a BIG-IP appliance.
Access Requirements: Because the EUD must be run while the TMOS operating system is not loaded (typically when the device cannot boot or requires hardware validation), it cannot be accessed via network-based interfaces like the Management Port or VLANs.
Console Connection: The administrator must connect a terminal to the physical Console Port (using a serial cable) to interact with the boot menu.
Execution Process: Upon restarting the appliance, the administrator must intercept the boot process at the GRUB menu and select the "End User Diagnostics" option. All output and menu selections are then handled through the serial console session.

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Question 23

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/kern.log
B./var/log/audit
C./var/log/daemon.log
D./var/log/ltm

Correct Answer: D

On a BIG-IP system, hardware-related alerts, including those for power supply units (PSUs), fans, and chassis components, are primarily logged in the Local Traffic Manager (LTM) log file.
Log Location: The file path is /var/log/ltm.
PSU Alert Messages: When a power supply fails, experiences an outage, or is unplugged, the chmand (Chassis Manager) or system_check processes log specific error codes to this file. For example, you may see messages like 010d0006:0: Chassis power supply <X> has experienced an issue or VINPUT=bad.
Troubleshooting: Administrators can use the command grep -i "power supply" /var/log/ltm to quickly filter for PSU-related events.

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Question 24

Which Virtual Server type prevents the use of a default pool?

A.Performance (Layer 4)
B.Forwarding (IP)
C.Performance HTTP
D.Standard

Correct Answer: B

In BIG-IP TMOS administration, the "Forwarding (IP)" virtual server type is unique because it is designed to act as a high-performance router rather than a typical load balancer. Unlike a
"Standard" virtual server, which terminates a connection and directs it to a specific pool of members, a Forwarding (IP) virtual server is intended to forward packets based on the system's routing table. Consequently, the configuration for this type of virtual server explicitly removes the option to associate a default pool. If an administrator is troubleshooting a scenario where they cannot assign a pool to a virtual server, they must verify if the type was accidentally set to Forwarding (IP). This type is most commonly used for outbound internet traffic (outbound SNAT) or to allow the BIG-IP to serve as a gateway between internal subnets. Identifying this constraint is vital for troubleshooting configuration errors where an administrator expects the system to load balance traffic but finds the pool association settings are grayed out or unavailable in the Configuration Utility.

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Question 25

A BIG-IP Administrator plans to upgrade a BIG-IP device to the latest TMOS version.
Which two tools could the administrator leverage to verify known issues for the target versions? (Choose two answers)

A.F5 End User Diagnostics (EUD)
B.F5 Bug Tracker
C.F5 University
D.F5 iHealth
E.F5 Downloads

Correct Answer: B,D

Before upgrading a BIG-IP system to a newer TMOS version, it is critical to review known issues to avoid introducing instability or regressions. F5 Bug Tracker (Option B) is a primary resource for this purpose. It allows administrators to search for documented software defects by TMOS version, module, symptom, or bug ID. Using Bug Tracker, an administrator can identify unresolved issues, fixed bugs, and behavioral changes that may affect their specific deployment, such as traffic handling, high availability, or module-specific functionality. This directly supports proactive troubleshooting and informed upgrade planning.
F5 iHealth (Option D) is another essential tool used during upgrade preparation. iHealth analyzes uploaded UCS or QKView files and correlates the device configuration and software version with F5's known issues database. It provides actionable reports highlighting critical defects, upgrade risks, interoperability concerns, and recommended target versions. iHealth is especially valuable because it contextualizes known issues based on the actual configuration running on the device.
The other options are not appropriate for verifying known software issues. F5 End User Diagnostics (Option A) is a client-side troubleshooting tool, F5 University (Option C) is a training platform, and F5 Downloads (Option E) is primarily used to obtain software images and release notes, not to analyze known defects in depth.

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