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>> F5CAB1 Exam Lab Questions <<
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NEW QUESTION # 50
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?
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 # 51
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 ยป Software Management ยป Image List?
Answer: C
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 # 52
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 the System menu?
Answer: B
Explanation:
To understand:
Which modules are licensed
Which modules are provisioned
The resource requirements (CPU / RAM) of each module
The administrator uses:
System ยป 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.
NEW QUESTION # 53
The Configuration Utility of a BIG-IP device is currently accessible via its management IP10.53.1.245from all VLANs.
The BIG-IP Administrator needs to restrict access so only hosts from the10.0.0.0/24subnet can access the Configuration Utility.
Which TMSH command accomplishes this?
Answer: C
Explanation:
BIG-IP controls access to the web-based Configuration Utility (TMUI) through the/sys httpd allowlist. This parameter specifies which client IPs or subnets may initiate HTTP/HTTPS connections to the management interface.
To restrict TMUI access toonlythe 10.0.0.0/24 subnet:
* The correct method is tomodify the HTTPD allow listso that it contains only this subnet.
* This requires replacing the entire current list with the new subnet using:
modify /sys httpd allow replace-all-with {10.0.0.0/24}
This ensures thatonlyclients within 10.0.0.0/24 can reach the Configuration Utility.
Why the other options are incorrect:
* Options A and Ccreate network ACL objects under /net acl, which apply to data-plane traffic, not management-plane TMUI access. TMUI access is not controlled by LTM ACLs but by the HTTPD allow directive.
* Option Bis incorrect syntax and references /ltm httpd, which is not the proper object; the correct hierarchy is /sys httpd.
Thus, only modifying the/sys httpd allowlist achieves the required restriction.
NEW QUESTION # 54
A BIG-IP device is licensed forLTM, ASM, APM, and AFM.
Currently, it will only be used forload balancingandweb application firewalling.
To ensure optimal performance and efficient resource utilization, which of the following module provisioning combinations is the best choice?
Answer: C
Explanation:
BIG-IP provisioning determines how CPU, memory, and disk resources are allocated to each module. The goal is to provision only the modules required and at levels appropriate to their performance needs.
Requirements in the question
The device will be used for:
* LTM(Local Traffic Manager) # load balancing
* ASM(Application Security Manager) # WAF
No functions require:
* APM (Access Policy Manager)
* AFM (Advanced Firewall Manager)
Why Option C is correct
Provisioning bothLTMandASMatNominallevel provides:
* Adequate performance for production load
* Plentiful system resources while avoiding dedicating the entire system to a single module
* Balanced allocation without starving memory or CPU
SettingAPM: NoneandAFM: Noneensures unused modules consume zero resources.
Why the other options are incorrect
A). Dedicated provisioning for both LTM and ASM
* Two modules cannot both run in "Dedicated" mode.
* Dedicated mode allocatesallresources to a single module - the second module cannot be dedicated simultaneously.
B). LTM and ASM both Dedicated
* Same issue: only one module can be Dedicated at a time.
* Also unnecessary for load balancing + WAF.
D). Setting APM and AFM to Minimal
* Minimal still consumes memory and CPU.
* Unused modules should be set toNone.
Therefore,Option Cis the best provisioning strategy.
NEW QUESTION # 55
......
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