[Aug-2026] F5-CA F5CAB1 Exam Practice Test Questions Dumps Bundle!
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NEW QUESTION # 21
The BIG-IP Administrator wants to manage the newly built F5 system through anin-band Self-IP.
The administrator has configured a VLAN and Self-IP and can ping the IP from their workstation, but cannot access the system viaSSHorHTTPS.
Whatport lockdownsettings should the BIG-IP Administrator use to allow management access on the Self-IP?
(Choose two.)
- A. The Self-IP port lockdown behavior could be adjusted toAllow Mgmt
- B. The Self-IP port lockdown behavior could be adjusted toAllow Default
- C. The Self-IP port lockdown behavior could be adjusted toAllow All
- D. The Self-IP port lockdown behavior could be adjusted toAllow Management
Answer: A,D
Explanation:
Self-IPs include a security feature calledPort Lockdown, which restricts which services respond on that Self- IP.
By default, Self-IPs block management access (SSH and HTTPS/TMUI), meaning an administrator cannot manage the device through in-band Self-IPs unless explicitly allowed.
Allow Mgmt / Allow Management
These settings enable only the management services required for administrative access, specifically:
* SSH (22)
* HTTPS/TMUI (443)
These options allow secure administration without opening unnecessary ports.
Why these are correct:
* They provide only the essential access for management.
* They follow F5 security best practices when using in-band admin access.
* They donotexpose all services, reducing the attack surface.
Why the other options are incorrect:
A). Allow Default
* This allows only a minimal set of system-required ports (e.g., failover, config sync), not SSH or HTTPS.
* Administrator access would still fail.
B). Allow All
* Opens all ports on the Self-IP, which isnot secure.
* Exposes services that should remain restricted.
Therefore,Allow Mgmt / Allow Managementare the correct choices.
NEW QUESTION # 22
What is the primary function of the Traffic Management Operating System (TMOS) in F5 BIG-IP?
- A. It provides the hardware resources for the system
- B. It encrypts data between servers
- C. It is responsible for system management and operations
- D. It allows for traffic routing between the Internet and data center
Answer: C
Explanation:
TMOS is the core operating system that powers F5 BIG-IP, managing traffic, security, and system functions.
NEW QUESTION # 23
What is required when setting up an HA (High Availability) pair of BIG-IP devices?
- A. Same IP address on both devices
- B. Different software versions on each device
- C. Same hardware model and version of software
- D. Configuration of load balancing on both devices
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 # 24
How should a BIG-IP Administrator check the provisioned CPU percent for a module?
(Choose two.)
- A. By checking the Dashboard output in the Statistics tab in the GUI.
- B. By running tmsh show /sys provision and reviewing the specific module in the output.
- C. By running tmsh show /sys cpu and reviewing the specific module provisioned output.
- D. By running the top command and reviewing the output for the provisioned module.
- E. By going to System > Resource Provisioning and hovering over the CPU section colors.
Answer: B,E
Explanation:
BIG-IP allocates CPU and memory resources based on module provisioning levels.
To view how much CPU a module is assigned, administrators must check provisioning information from:
C). GUI - System > Resource Provisioning
This page visually displays CPU allocation via color-coded bars.
Hovering over the CPU bar shows:
* CPU usage percent per module
* Which modules share CPU cycles
* The system's total resource allocation
This is the primary GUI method.
D). tmsh show /sys provision
This command displays detailed module provisioning information including:
* Provisioned modules
* Their provisioning level
* CPU and memory allocation data
It is the authoritative CLI method for resource provisioning status.
Why the other options are incorrect:
A). top
* Shows real-time process usage, not provisioned CPU allocation.
B). tmsh show /sys cpu
* Displays CPU runtime utilization, not per-module provisioning.
E). Statistics Dashboard
* Only shows traffic / system runtime metrics, not provisioning resource allocations.
Therefore, C and D are correct.
NEW QUESTION # 25
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?
- A. Software Management
- B. Resource Provisioning
- C. Configuration ?Device
- D. Configuration ?OVSDB
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 » 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 # 26
For security reasons, a BIG-IP Administrator needs to specify allowable IP ranges for access to the Configuration Utility (WebUI).
The exhibit shows the User Administration section of the Configuration Utility.
The administrator could not find any setting that explicitly restricts access to the Configuration Utility.
Which one of the following is a reason for that?
- A. The administrator needs to switch to the "Advanced" view mode in order to display the relevant setting
- B. To avoid locking out the administrator, recent versions of BIG-IP no longer allow restricting administrator access to the Configuration Utility by source IP address
- C. Restricting access to the Configuration Utility can only be done from the Command Line Interface
- D. The administrator must restrict access by IP address for SSH, which will implicitly restrict access to the Configuration Utility
Answer: C
Explanation:
The screenshot shown is from theUser Administrationsection of the BIG-IP GUI.
This section controls:
* Root and Admin passwords
* SSH Access
* SSH IP Allow settings
However,it does not contain any controls for restricting access to the WebUI (TMUI).
BIG-IP does not provide TMUI access restrictions from this part of the GUI.
Access to the web-based Configuration Utility is controlled by thehttpd allow list, configured through TMSH:
tmsh modify /sys httpd allow { <IP/subnet> }
This setting is not displayed in the User Administration panel, and in many BIG-IP versions, the httpd allow list isonly configurable from the CLI, not the GUI.
Therefore, the administrator cannot find the setting in the screen shown because:
* TMUI access restriction isnotlocated in this GUI section
* It must be configured usingtmshunder/sys httpd allow
This is whyOption Ais correct.
NEW QUESTION # 27
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 copies the image to /var/local/images/
- B. The system verifies the internal checksum
- C. The system performs a reboot into a new partition
Answer: B
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 # 28
The BIG-IP Administrator uses Secure Copy Protocol (SCP) to upload a TMOS image to the /shared/images/ directory in preparation for an upgrade.
After the upload is complete, what will the system do before the image appears in the GUI under:
System > Software Management > Image List ?
- A. The system copies the image to /var/local/images/
- B. The system verifies the internal checksum
- C. The system performs a reboot into the new partition
Answer: B
Explanation:
When a TMOS ISO file is transferred to /shared/images/ , the BIG-IP automatically performs a validation step:
Checksum Verification
* Before the image becomes visible in the GUI, the system verifies the internal checksum embedded inside the ISO.
* This ensures:
* The file was fully transferred
* The image is not corrupted
* It matches the official F5 release signature
* Only after passing this verification does the GUI display the ISO under "Available Images." Why the other options are incorrect:
A). Reboot into a new partition
* No reboot occurs simply from uploading an image.
C). Copying into /var/local/images/
* This directory is not used for ISO storage.
* All valid images remain in /shared/images/ .
Thus, the correct system action is checksum verification .
NEW QUESTION # 29
What are the two options for securing a BIG-IP's management interface? (Choose two.)
- A. Block all management-interface administrative HTTPS and SSH service ports to prevent access.
- B. Restrict administrative HTTPS and SSH access to specific IP addresses or IP ranges.
- C. Use the BIG-IP's Self-IP addresses for administrative access rather than the management interface.
- D. Limiting network access through the management interface to a trusted/secured network VLAN.
Answer: B,D
Explanation:
Securing the BIG-IP management interface is a fundamental administrative responsibility. F5 best practices emphasize restricting who can reach the management port and ensuring that only authorized systems are allowed access.
A). Limiting management access to trusted network segments
F5 recommends placing the management interface on a dedicated, isolated, and secured management network or VLAN, rather than exposing it to production or untrusted networks.
This reduces the attack surface by ensuring only trusted segments have visibility to administrative interfaces.
D). Restricting management access by IP or subnet
F5 BIG-IP uses the /sys httpd allow list (for HTTPS) and configuration options in sshd (for SSH) to control which IP addresses or subnets can access the device.
By specifying only known administrative IPs or ranges, unauthorized users cannot reach the login services.
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 sys management-ip <ip address>/<mask> - B. Log into the remote console and configure the management IP by running theconfigexecutable.
- C. Log into the remote console and configure the management IP by running thesetupcommand.
- D. Log into the remote console and configure the management IP through TMSH using:
create ltm management-ip <ip address>/<mask>
Answer: A,B
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
Which option in the BIG-IP Configuration utility is used to configure the system's routes?
- A. System > Network > VLANs
- B. System > Network > Routes
- C. Traffic Management > Routes
- D. Local Traffic > Routes
Answer: B
Explanation:
Routing settings for the BIG-IP system can be configured under System > Network > Routes in the Configuration utility.
NEW QUESTION # 32
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 asPort 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 port4353is used byDevice 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 isexempt from Port Lockdown rules.
Why the other options are incorrect
A). TCP 443
* Not required for device trust or synchronization.
* HTTPS access is fully controlled by Port Lockdown.
C). UDP 53
* DNS traffic is not required for synchronization and has no exemption under Port Lockdown.
NEW QUESTION # 33
What will setting a Self IP to"Allow None"for Port Lockdown do?
- A. Default allow port 1026 access between peer devices and traffic processing across the network failover.
- B. Block HA communications, causing the systems to report their peer as online ready.
- C. Block HA communications, causing the systems to report their peer as offline and go active-active.
Answer: C
Explanation:
ThePort Lockdownfeature controls which services a Self-IP will respond to.
Setting a Self-IP toAllow Nonemeans:
* The Self-IP will not acceptanytraffic except the very limited, hard-coded HA ports such asTCP 4353 used for device trust and configuration sync.
* All other HA ports, including those needed for network failover and other HA mechanisms,are blocked.
When essential HA services cannot communicate, each device assumes its peer is down.
This results in:
* HA failover misbehavior
* Both devices thinking the other is offline
* Potentialactive-active condition, which is not intended and can cause traffic disruption Thus,Allow Nonecan break HA functionality unless the Self-IP is not used for HA links.
NEW QUESTION # 34
For an upgrade of a standalone BIG-IP, a maintenance window is available in which brief interruptions are allowed.
Actions with no impact can be done outside the maintenance window.
When should a license reactivation be performed?
- A. Before the maintenance window.
- B. During the maintenance window.
- C. After the maintenance window.
Answer: A
Explanation:
License reactivation updates the BIG-IP device's license file to ensure:
* TheService Check Dateis current
* The device is eligible to install the intended TMOS version
* Any module entitlement updates are received
Reactivationdoes not interrupt trafficand does not require a reboot, making it safe to performbeforethe maintenance window.
F5 best practices state:
* Performall non-impact tasks priorto the scheduled maintenance window
* Leave the window available for activities that require rebooting, such as the software installation itself Since license reactivation isnon-disruptive, it should be donebeforethe upgrade window starts.
NEW QUESTION # 35
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. Software Management
- B. Configuration Device
- C. Resource Provisioning
- D. Configuration OVSDB
Answer: C
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 # 36
In order to configure allowed IP addresses for SSH access to a BIG-IP device, the BIG-IP Administrator has issued the commands shown in the exhibit.
Which IP addresses will have SSH access after issuing the shown commands?
(Choose two.)
- A. 100.0.0.10
- B. 10.0.0.256
- C. 10.0.0.100
- D. 10.0.0.254
- E. 100.0.1.10
Answer: C,D
Explanation:
From the exhibit, the administrator performs the following actions:
* Displays the current SSH allow configuration:
tmsh list sys sshd allow
allow { ALL }
* Replaces the existing SSH allow list with a specific subnet:
tmsh modify sys sshd allow replace-all-with { 10.0.0.0/24 }
* Confirms the updated configuration:
tmsh list sys sshd allow
allow { 10.0.0.0/24 }
This configuration restricts SSH access to only hosts that fall within the 10.0.0.0/24 network.
Evaluation of the options
A). 10.0.0.100
This address is within the 10.0.0.0/24 subnet and is a valid host address, so SSH access is permitted.
B). 10.0.0.254
This address is also within the 10.0.0.0/24 subnet and is a valid host address, so SSH access is permitted.
C). 10.0.0.256
This is not a valid IP address because an IPv4 octet cannot exceed 255.
D). 100.0.1.10
This address is outside the configured 10.0.0.0/24 subnet and will not be allowed.
E). 100.0.0.10
This address is also outside the configured subnet and will not be allowed.
NEW QUESTION # 37
Which configuration file can a BIG-IP administrator use to verify theprovisioned modules?
- A. /config/bigip_base.conf
- B. /var/local/ucs/config.ucs
- C. /config/bigip.conf
- D. /config/bigip.license
Answer: C
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 # 38
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 # 39
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