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F5 F5CAB1 Study Plan - F5CAB1 Latest Exam Labs

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F5 BIG-IP Administration Install, Initial Configuration, and Upgrade Sample Questions (Q26-Q31):

NEW QUESTION # 26
Which command will display thecurrent active volumeon a BIG-IP system?

A. tmsh show sys version
B. tmsh show sys software status
C. tmsh list sys software update

Answer: B

Explanation:
To identify which boot volume is currently active on a BIG-IP system, the correct command is:
tmsh show sys software status
This command displays:
* All installed boot volumes (HD1.1, HD1.2, HD1.3, etc.)
* The BIG-IP software version installed on each volume
* TheActivefield, indicating which volume the system is currently booted from
* The installation status ("complete", "in-progress", "allowed")
This is thestandard and authoritativeway to determine the active boot location.
Why the other options are incorrect:
A). tmsh show sys version
* Displays OS version, build, and date.
* Doesnotshow boot locations or which volume is active.
C). tmsh list sys software update
* Shows software update configurations, not boot volume status.
* Does not display which volume is active.

NEW QUESTION # 27
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?

A. LTM: Dedicated
ASM: Dedicated
APM: None
AFM: None
B. LTM: Dedicated
ASM: Dedicated
APM: Minimal
AFM: Minimal
C. LTM: Nominal
ASM: Nominal
APM: Minimal
AFM: Minimal
D. LTM: Nominal
ASM: Nominal
APM: None
AFM: None

Answer: D

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 # 28
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 prioritizesservice continuity, predictable failover, andminimal 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
OptionCexactly matches F5's documented production-safe upgrade method:
* Upgrade thestandbynode 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 causetotal outage, because both HA members would be unavailable at the same time.

NEW QUESTION # 29
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?

A. (tmos)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0 0.0.0.255 host 10.53.1.245 http) }
B. (tmos)# modify /sys httpd allow replace-all-with {10.0.0.0/24}
C. (tmos)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0/24 10.53.1.245 http) (deny ip any any http) }
D. (tmos)# modify /ltm httpd allow replace-all-with {10.0.0.0/24}

Answer: B

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 # 30
An F5 VE has been deployed into a VMware environment via an OVF file.
An administrator wants to configure the management IP address so the VE can be accessed for further setup.
Which two are valid methods for configuring the management-ip address? (Choose two.)

A. Log into the remote console and configure the management IP through TMSH using:
create ltm management-ip <ip address>/<mask>
B. Log into the remote console and configure the management IP by running thesetupcommand.
C. Log into the remote console and configure the management IP through TMSH using:
create sys management-ip <ip address>/<mask>
D. Log into the remote console and configure the management IP by running theconfigexecutable.

Answer: C,D

Explanation:
A newly deployed BIG-IP Virtual Edition (VE) in VMware requires initial configuration of itsmanagement- ipaddress so it can be accessed over the network. F5 provides several valid mechanisms during initial console access:
A). Running the config utility
* The config script is available on new BIG-IP installations and VE deployments.
* It launches a guided text-based wizard allowing configuration of:
* Management IP
* Netmask
* Default route
* This is a standard and recommended method during first-time setup.
B). Using TMSH with create sys management-ip
* Administrators can enter TMSH directly from the console and run:
* create sys management-ip <ip>/<mask>
* The management-ip object resides undersys, not under ltm or any other module.
* This is the correct tmsh method for defining the management interface address.
Why the other options are incorrect:
C). create ltm management-ip
* There isnosuch object under /ltm.
* LTM handles traffic objects (virtual servers, pools), not system management interfaces.
D). Running the setup command
* The setup command is used for general system configuration butdoes not configure the management- ip.
* It is not the supported method for initial management IP assignment on VE deployments.
Therefore, the valid methods are running theconfigutility and using thesys management-ipcommand within TMSH.

NEW QUESTION # 31
......

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