Latest F5 F5CAB1 Free Certification Exam Material with 62 Q&As
UPDATED F5CAB1 Exam Questions Certification Test Engine to PDF
F5 F5CAB1 Exam Syllabus Topics:
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NEW QUESTION # 17
The device is currently on v15.1.2.1.
The BIG-IP Administrator needs to boot the device back to v13.1.0.6 to gather data for troubleshooting.
The system shows:
Sys::Software Status
Volume Product Version Build Active Status Allowed
HD1.1 BIG-IP 15.1.2.1 0.0.10 yes complete yes
HD1.2 BIG-IP 13.1.0.6 0.0.3 no complete yes
Which is the correct command-line sequence to boot the device to version 13.1.0.6?
- A. Use tmsh to select a new boot volume, tmsh reboot HD1.2
- B. switchboot -b HD1.2, then reboot
- C. switchboot -I HD1.2, then reboot
- D. Use tmsh to select a new boot volume, tmsh switchboot HD1.2
Answer: B
Explanation:
To change the boot volume on a BIG-IP system from one installed TMOS version to another, the correct CLI tool is:
switchboot
The correct syntax uses the -b flag:
switchboot -b <volume>
This command marks the specified boot location as the one to be used on the next reboot.
Thus, to boot into HD1.2 which contains 13.1.0.6, the sequence is:
Mark HD1.2 as the next boot location:
switchboot -b HD1.2
Reboot the system:
reboot
This is the standard and officially supported method for selecting a different installed volume.
NEW QUESTION # 18
The BIG-IP Administrator uses Secure Copy Protocol (SCP) to upload a TMOS image to the/shared/images/ directory in preparation for a TMOS upgrade.
After the upload is completed, what will the system dobeforethe image is shown in the GUI under:
System - Software Management - Image List?
- A. The system verifies the internal checksum
- B. The system copies the image to /var/local/images/
- C. The system performs a reboot into a new partition
Answer: A
Explanation:
When a TMOS image (.iso file) is uploaded into the/shared/images/directory, the BIG-IP performs an internal validation step before the ISO appears in the GUI.
1. The system verifies the internal checksum
* BIG-IP automatically reads the embedded checksum inside the ISO file
* Verifies integrity of the uploaded image
* Confirms the file is not corrupted or incomplete
* Ensures the image is a valid F5 TMOS software image
Only after this checksum verification succeeds does the image appear under:
System # Software Management # Image List
Why the other options are incorrect:
A). The system performs a reboot into a new partition
* Uploading an ISO file never triggers a reboot.
C). The system copies the image to /var/local/images/
* All valid TMOS images remain in/shared/images/.
* No copying occurs.
NEW QUESTION # 19
What is the first step in the initial setup of a BIG-IP device?
- A. Configuring the default route
- B. Licensing the system
- C. Configuring SSL profiles
- D. Setting up VLANs
Answer: B
Explanation:
Licensing the system is the first step to activate the features and allow you to begin configuring the device.
NEW QUESTION # 20
What should you do before performing a software upgrade on BIG-IP?
- A. Delete unused routes
- B. Make a backup of the configuration
- C. Shut down all virtual servers
- D. Deactivate all SSL certificates
Answer: B
Explanation:
It's crucial to back up the system configuration before upgrading to ensure you can restore the system if the upgrade fails.
NEW QUESTION # 21
What command will allow the BIG-IP Administrator to view theconfigured management IPof a BIG-IP system?
(Choose one.)
- A. tmsh list sys management-route
- B. tmsh show sys management-ip
- C. tmsh list net self
- D. tmsh list sys management-ip
Answer: D
Explanation:
Comprehensive and Detailed Explanation (Paraphrased)
The BIG-IP stores the configured management IP address as asystem configuration objectunder the/sys hierarchy.
To display configured (persistent) values, BIG-IP uses thetmsh list command, not show.
Why tmsh list sys management-ip is correct
* The management IP configuration is defined under:
* /sys management-ip
* Running:
* tmsh list sys management-ip
displays:
* The configured management IP address
* Netmask
* Associated attributes
This command shows theactual configured management IP, which is what the question asks for.
Why the other options are incorrect
A). tmsh show sys management-ip
* The show command is used for runtime statistics and status.
* management-ip is a configuration object, not a statistics object.
C). tmsh list sys management-route
* Displays management routing information, not the management IP address itself.
D). tmsh list net self
* Displays Self IPs used on the data plane.
* Does not show the management interface IP.
NEW QUESTION # 22
An administrator is in the process of reactivating the license using the interface displayed in the exhibit.
What is the address of the license server to which the BIG-IP device must be able to establish an outbound connection in order to use the Automatic Activation Method?
- A. ask.f5.com
- B. activate.f5.com
- C. license.f5.com
- D. callhome.f5.com
Answer: B
Explanation:
When you choose Automatic as the activation method in the License > Re-activate screen, the BIG-IP device itself contacts F5's license activation service over the Internet.
For successful automatic activation:
The BIG-IP must have outbound network connectivity (typically via the management interface).
DNS resolution and routing must allow it to reach the F5 license activation host (the one shown in option D).
The device sends its dossier and registration key to that service and receives an updated license file in return, which is then installed automatically.
The other hostnames in the options are not used by BIG-IP for license activation, so they cannot be correct in the context of Automatic Activation.
NEW QUESTION # 23
An administrator is in the process of reactivating the license using the interface displayed in the exhibit.
What is the address of the license server to which the BIG-IP device must be able to establish an outbound connection in order to use the Automatic Activation Method ?
- A. ask.f5.com
- B. activate.f5.com
- C. license.f5.com
- D. callhome.f5.com
Answer: B
Explanation:
When you choose Automatic as the activation method in the License > Re-activate screen, the BIG-IP device itself contacts F5's license activation service over the Internet.
For successful automatic activation:
* The BIG-IP must have outbound network connectivity (typically via the management interface).
* DNS resolution and routing must allow it to reach the F5 license activation host (the one shown in option D).
* The device sends its dossier and registration key to that service and receives an updated license file in return, which is then installed automatically.
The other hostnames in the options are not used by BIG-IP for license activation, so they cannot be correct in the context of Automatic Activation .
NEW QUESTION # 24
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
- A. UDP 53
- B. TCP 4353
- C. TCP 443
Answer: B
Explanation:
Self-IPs implement a security feature known as Port Lockdown, which limits which services are reachable on a Self-IP.
However, certain services required for BIG-IP device-to-device communication bypass Port Lockdown to ensure cluster and HA functionality.
TCP 4353
TCP port 4353 is used by Device Service Clustering (DSC) for:
Device trust establishment
Configuration synchronization
Failover communication
Because BIG-IP devices must always be able to communicate for HA functions to remain operational, port 4353 is exempt from Port Lockdown rules.
NEW QUESTION # 25
A BIG-IP Administrator is responsible for deploying a new software image on an F5 BIG-IP HA pair and has scheduled a one-hour maintenance window.
With a focus on minimizing service disruption, which of the following strategies is the most appropriate?
- A. Update the standby node first and reboot it to the newly updated boot location, failover to the newly updated node and verify functionality. Repeat the upgrade procedures on the next node, which is now in standby mode.
- B. Reset the Device Trust, apply the update to each node separately, reboot both nodes, then re-establish the Device Trust.
- C. Update the active node first, reboot to the newly updated boot location and verify functionality, then push the update from the active to the standby node and reboot the standby node.
- D. Update both nodes in the HA pair, then reboot both nodes simultaneously to ensure they run the same software version.
Answer: A
Explanation:
For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizes service continuity
, predictable failover , and minimal downtime . The established best-practice sequence is:
* Upgrade the standby unit first
* Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
* Boot the standby unit into the newly installed version
* Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
* Perform a controlled failover to the upgraded unit
* Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
* Upgrade the second device (now standby)
* The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
Option C exactly matches F5's documented production-safe upgrade method:
* Upgrade the standby node first
* Reboot into new image
* Failover to upgraded device
* Validate
* Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.
Why the other options are incorrect:
A). Upgrade the active node first
* Upgrading the active device requires removing it from service and failing over abruptly. This is not recommended and increases service disruption risk.
B). Resetting device trust
* Resetting trust is unnecessary and can disrupt configuration sync, peer communication, and cluster operation. It is not part of any standard upgrade workflow.
D). Upgrading and rebooting both nodes simultaneously
* This would cause total outage , because both HA members would be unavailable at the same time.
NEW QUESTION # 26
An administrator is in the process of reactivating the license using the interface displayed in the exhibit.
What is the address of the license server to which the BIG-IP device must be able to establish an outbound connection in order to use theAutomatic Activation Method?
- A. ask.f5.com
- B. activate.f5.com
- C. license.f5.com
- D. callhome.f5.com
Answer: B
Explanation:
When you chooseAutomaticas the activation method in the License Re-activate screen, the BIG-IP device itself contacts F5'slicense activation serviceover the Internet.
For successful automatic activation:
* The BIG-IP must have outbound network connectivity (typically via the management interface).
* DNS resolution and routing must allow it to reach theF5 license activation host(the one shown in option D).
* The device sends its dossier and registration key to that service and receives an updated license file in return, which is then installed automatically.
The other hostnames in the options are not used by BIG-IP for license activation, so they cannot be correct in the context ofAutomatic Activation.
NEW QUESTION # 27
What happens after upgrading the BIG-IP system?
- A. The system enters a maintenance mode
- B. The system continues to run the previous version until manually restarted
- C. The configuration must be reapplied manually
- D. The system automatically restarts and applies the new version
Answer: D
Explanation:
After a successful upgrade, the system automatically restarts and applies the newly uploaded software version.
NEW QUESTION # 28
A BIG-IP Administrator needs to purchase new licenses for a BIG-IP appliance.
The administrator needs to know:
* Whether a module is licensed
* The memory requirement for that module
Where should the administrator view this information in theSystem menu?
- A. Resource Provisioning
- B. Configuration OVSDB
- C. Configuration Device
- D. Software Management
Answer: A
Explanation:
To understand:
* Which modules arelicensed
* Which modules areprovisioned
* Theresource requirements(CPU / RAM) of each module
The administrator uses:
System Resource Provisioning
This page displays:
* All modules present in the license
* Whether they are enabled or disabled
* Required memory to activate each module
* CPU and disk allocation information
* Provisioning level options (None / Minimal / Nominal / Dedicated)
This is the exact location where BIG-IP administrators evaluate module capacity before enabling or purchasing licensing upgrades.
Why the other options are incorrect:
A). Configuration OVSDB
* Used for network virtualization integrations, not licenses or modules.
B). Software Management
* Used for software image installation, not licensing.
C). Configuration Device
* Displays hostname, failover settings, device properties - not module resource requirements.
Thus, module licensing and memory requirement data are found underResource Provisioning.
NEW QUESTION # 29
A BIG-IP Administrator needs to purchase new licenses for a BIG-IP appliance.
The administrator needs to know:
* Whether a module is licensed
* The memory requirement for that module
Where should the administrator view this information in theSystem menu?
- A. Resource Provisioning
- B. Configuration - Device
- C. Configuration - OVSDB
- D. Software Management
Answer: A
NEW QUESTION # 30
A BIG-IP Administrator needs to verify the state of equipment in the data center.
A BIG-IP appliance has asolid yellow indicatoron the status LED.
How should the administrator interpret this LED indicator?
- A. A warning-level alarm condition is present
- B. A power supply is NOT operating properly
- C. Appliance is halted or in End-User Diagnostic (EUD) mode
- D. Appliance is a standby member in a device group
Answer: A
Explanation:
BIG-IP hardware platforms use chassis LEDs to indicate system health states.
Asolid yellow status LEDtypically indicates awarning condition, such as:
* A non-critical hardware alert
* A temperature threshold nearing limit
* A minor fan or sensor irregularity
* Other non-fatal environmental or system conditions
This state reflects awarning-level alarm, meaning the unit is operational but requires investigation.
Why the other options are incorrect
A). Halted or EUD mode
* This is associated with different LED patterns (usually flashing conditions or specific color codes), not a solid yellow status LED.
B). Standby in device group
* HA state is not indicated by the chassis status LED.
* Standby status is alogicaldevice state, not a hardware LED state.
D). Power supply failure
* Power supply indicators use separate LEDs located on each power module (usually flashing amber/red), not the system status LED.
Thus, asolid yellow status indicatorsignifies awarning-level alarm.
NEW QUESTION # 31
What is required when setting up an HA (High Availability) pair of BIG-IP devices?
- A. Same IP address on both devices
- B. Configuration of load balancing on both devices
- C. Same hardware model and version of software
- D. Different software versions on each device
Answer: C
Explanation:
For HA to function correctly, both devices need to be running the same software version and have the same hardware model to ensure compatibility and synchronization.
NEW QUESTION # 32
Which configuration file can a BIG-IP administrator use to verify theprovisioned modules?
- A. /config/bigip.license
- B. /var/local/ucs/config.ucs
- C. /config/bigip_base.conf
- D. /config/bigip.conf
Answer: D
Explanation:
Provisioning settings define which modules are enabled and how system resources are allocated to them.
These provisioning declarations are stored in:
/config/bigip.conf
This file contains:
* Full module provisioning statements
* TMSH-equivalent provisioning configurations such as:
* sys provision ltm { level nominal }
* sys provision asm { level nominal }
It is theprimary system configuration filethat stores all active provisioning details.
Why the other answers are incorrect
A). /config/bigip.license
* Showslicensedmodules, not provisioned modules.
B). /config/bigip_base.conf
* Stores base networking (VLANs, Self-IPs, routes), not provisioning.
D). config.ucs
* A backup archive, not a live configuration file.
Thus, the correct file to review active module provisioning is/config/bigip.conf.
NEW QUESTION # 33
Which configuration file can a BIG-IP administrator use to verify the provisioned modules?
- A. /config/bigip.license
- B. /var/local/ucs/config.ucs
- C. /config/bigip_base.conf
- D. /config/bigip.conf
Answer: D
Explanation:
Provisioning settings define which modules are enabled and how system resources are allocated to them.
These provisioning declarations are stored in:
/config/bigip.conf
This file contains:
Full module provisioning statements
TMSH-equivalent provisioning configurations such as:
sys provision ltm { level nominal }
sys provision asm { level nominal }
It is the primary system configuration file that stores all active provisioning details.
NEW QUESTION # 34
A BIG-IP Administrator needs to verify the state of equipment in the data center.
A BIG-IP appliance has a solid yellow indicator on the status LED.
How should the administrator interpret this LED indicator?
- A. A warning-level alarm condition is present
- B. A power supply is NOT operating properly
- C. Appliance is halted or in End-User Diagnostic (EUD) mode
- D. Appliance is a standby member in a device group
Answer: A
Explanation:
BIG-IP hardware platforms use chassis LEDs to indicate system health states.
A solid yellow status LED typically indicates a warning condition, such as:
A non-critical hardware alert
A temperature threshold nearing limit
A minor fan or sensor irregularity
Other non-fatal environmental or system conditions
This state reflects a warning-level alarm, meaning the unit is operational but requires investigation.
NEW QUESTION # 35
......
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