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Valid F5CAB1 Test Answers & F5CAB1 Exam PDF
F5 F5CAB1 Exam Syllabus Topics:
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NEW QUESTION # 10
A BIG-IP Administrator needs to install a HotFix on a standalone BIG-IP device, which has HD1.1 as the Active Boot Location.
The administrator has already re-activated the license and created a UCS archive.
In which sequence should the administrator perform the remaining steps?
- A. Activate HD1.2, Install base Image in HD1.2, Install HotFix in HD1.2
- B. Install base Image in HD1.2, Install HotFix in HD1.2, Activate HD1.2
- C. Install HotFix in HD1.1, Reboot the BIG-IP device, Install UCS Archive
- D. Install HotFix in HD1.2, Install base Image in HD1.2, Activate HD1.2
Answer: B
Explanation:
When installing a HotFix on a BIG-IP device, F5 best practices require:
Installing the base TMOS image on a new, unused boot volume (HD1.2)
This ensures the upgrade happens on a clean volume.
The existing active boot location remains untouched for rollback.
Installing the HotFix onto the SAME new boot volume (HD1.2)
HotFixes must be applied on top of a base version.
They cannot be installed on an empty volume.
They must match the base image version.
Activating the new boot volume (HD1.2)
The system reboots into the updated software stack.
Activation happens after base + HotFix installation is complete.
This sequence is exactly shown in Option C:
Install base Image in HD1.2
Install HotFix in HD1.2
Activate HD1.2
NEW QUESTION # 11
How should a BIG-IP Administrator check the provisioned CPU percent for a module? (Choose two.)
- A. By running the top command and reviewing the output for the provisioned module.
- B. By going to System ?Resource Provisioning and hovering over the CPU section colors.
- C. By running tmsh show /sys provision and reviewing the specific module in the output.
- D. By running tmsh show /sys cpu and reviewing the specific module provisioned output.
- E. By checking the Dashboard output in the Statistics tab in the GUI.
Answer: B,C
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 ยป 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.
NEW QUESTION # 12
Which one of the following is aport and protocol combination allowedby theAllow Defaultsetting for Port Lockdown?
- A. TCP 80
- B. UDP 8443
- C. TCP 443
Answer: C
Explanation:
Port Lockdown controls which ports and protocols aSelf IPwill respond to.
TheAllow Defaultsetting permits only a predefined set of BIG-IP internal and required service ports.
The Allow Default listincludes:
* TCP 443# HTTPS (Management/TMUI access via Self-IP)
* TCP 4353 # CMI (device sync)
* TCP/UDP ports related to HA communication
* Other essential internal F5 ports
Why TCP 443 is correct:
* It is one of the officially allowed ports underAllow Default.
* It enables HTTPS/TMUI access through a Self IP.
Why the other options are incorrect:
A). TCP 80 (HTTP)
* Not allowed under Allow Default
* HTTP via Self-IP is blocked unless placed under Allow Custom
B). UDP 8443
* Not an F5 default service
* Not part of the Allow Default ports
NEW QUESTION # 13
Which two items demonstrate the creation of a new volume for software images? (Choose two.)
- A. tmsh install /sys software image BIGIP-<version>.iso volume HD1.5 create-volume
- B. tmsh install sys software image /shared/images/BIGIP-<version>.iso volume HD1.5 create- volume
- C. Using the GUI, go to System > Disk Management, select New Volume. In the pop-up window, type the name or number of the new volume and click Apply.
- D. tmsh install software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume
- E. Using the GUI, go to System > Software Management > Available Images > Install, and in the Install Software Image pop-up window, type the new volume name or number and click Install.
Answer: C,D
Explanation:
In BIG-IP, software images are installed on boot volumes (for example, HD1.1, HD1.2, HD1.3, etc.).
To install software on a new volume, the administrator must instruct the system to create a new boot location before installation.
There are two correct ways to create a new volume:
A). tmsh command (with correct syntax)
tmsh install software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume This syntax correctly includes:
install software image
full path to ISO (/shared/images/...)
volume name (HD1.5)
create-volume keyword
This instructs BIG-IP to create the new boot volume as part of the installation.
C). Using the GUI System > Disk Management
From the Disk Management menu, the administrator can:
Select "New Volume"
Enter the volume identifier (e.g., HD1.5)
Apply changes
This GUI method is officially supported and explicitly creates a new boot volume before installing the software.
NEW QUESTION # 14
The device is currently onv15.1.2.1.
The BIG-IP Administrator needs to boot the device back tov13.1.0.6to 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 version13.1.0.6?
- A. Use tmsh to select a new boot volume, tmsh reboot HD1.2
- B. switchboot -b HD1.2, then reboot
- C. Use tmsh to select a new boot volume, tmsh switchboot HD1.2
- D. switchboot -I HD1.2, then reboot
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-bflag:
switchboot -b <volume>
This command marks the specified boot location as the one to be used on the next reboot.
Thus, to boot intoHD1.2which contains13.1.0.6, 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.
Why the other options are incorrect:
A). "tmsh reboot HD1.2"
* There is no such tmsh syntax.
* Boot volume cannot be selected by adding a parameter to reboot.
C). switchboot -I HD1.2
* The -I flag is invalid. Only -b is used.
D). "tmsh switchboot HD1.2"
* switchboot isnota tmsh command; it is a system-level shell utility.
Therefore,Option Bis the correct and valid command sequence.
NEW QUESTION # 15
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. Software Management
- D. Configuration - OVSDB
Answer: A
NEW QUESTION # 16
A BIG-IP device will be dedicated to functioning as a WAF, requiring only theASMmodule to be provisioned.
What provisioning level will ensure that the system allocatesall CPU, memory, and disk resourcesto this module exclusively?
- A. Dedicated
- B. Comprehensive
- C. Nominal
- D. Maximal
Answer: A
Explanation:
Provisioning defines how BIG-IP allocates system resources to modules. The provisioning levels include:
* Dedicated- allocatesallCPU, memory, and disk resources to a single module
* Nominal- standard resource allocation balanced with other modules
* Minimal- lowest level, used for basic utility needs
* None- module disabled
* Comprehensive / Maximal- not valid TMOS provisioning levels
Why "Dedicated" is correct
When a BIG-IP device is intended to runonly ASM(Web Application Firewall), the recommended way to maximize performance is to provision the module atDedicatedlevel.
WithASM: Dedicated:
* ASM receives theentire hardware capacity
* No other modules can or should be provisioned
* This is explicitly recommended when a device is used solely as a WAF platform Why other options are incorrect B). Comprehensive / C. Maximal
* These arenot valid provisioning modesin BIG-IP.
* TMOS supports: Nominal, Minimal, Large (module-specific), and Dedicated.
D). Nominal
* Shares resources with other modules
* Does not provide full system performance
* Not suitable when exclusive resource allocation is required
Thus,Dedicatedis the correct provisioning choice.
NEW QUESTION # 17
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)# modify /sys httpd allow replace-all-with {10.0.0.0/24}
- B. (tmos)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0 0.0.0.255 host 10.53.1.245 http) }
- C. (tmos)# modify /ltm httpd allow replace-all-with {10.0.0.0/24}
- D. (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) }
Answer: A
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 # 18
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. Restricting access to the Configuration Utility can only be done from the Command Line Interface
- B. The administrator must restrict access by IP address for SSH, which will implicitly restrict access to the Configuration Utility
- C. 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
- D. The administrator needs to switch to the "Advanced" view mode in order to display the relevant setting
Answer: A
Explanation:
The screenshot shown is from the User Administration section 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 the httpd 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 is only configurable from the CLI , not the GUI.
Therefore, the administrator cannot find the setting in the screen shown because:
* TMUI access restriction is not located in this GUI section
* It must be configured using tmsh under /sys httpd allow
This is why Option A is correct.
NEW QUESTION # 19
Which two items demonstrate thecreation of a new volumefor software images?
(Choose two.)
- A. tmsh install /sys software image BIGIP-<version>.iso volume HD1.5 create-volume
- B. tmsh install sys software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume
- C. Using the GUI, go toSystem > Software Management > Available Images > Install, and in the Install Software Image pop-up window, type the new volume name or number and clickInstall.
- D. tmsh install software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume
- E. Using the GUI, go toSystem > Disk Management, selectNew Volume. In the pop-up window, type the name or number of the new volume and clickApply.
Answer: D,E
Explanation:
In BIG-IP, software images are installed onboot volumes(for example, HD1.1, HD1.2, HD1.3, etc.).
To install software on anew volume, the administrator must instruct the system to create a new boot location before installation.
There are two correct ways to create a new volume:
A). tmsh command (with correct syntax)
tmsh install software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume This syntax correctly includes:
* install software image
* full path to ISO (/shared/images/...)
* volume name (HD1.5)
* create-volumekeyword
This instructs BIG-IP to create the new boot volume as part of the installation.
C). Using the GUI # System > Disk Management
From the Disk Management menu, the administrator can:
* Select "New Volume"
* Enter the volume identifier (e.g., HD1.5)
* Apply changes
This GUI method is officially supported and explicitly creates a new boot volume before installing the software.
Why the other options are incorrect:
B). Incorrect tmsh syntax
* Missing /shared/images/ path
* Incorrect command structure
D). Incorrect command structure
* Missing required keywords and correct command hierarchy
E). Software Management # Install does NOT create volumes
* This installs to anexistingvolume only
* The GUI install dialog does not create new boot volumes
Thus, onlyOption AandOption Cproperly create a new software volume.
NEW QUESTION # 20
The monitoring team reports that the SNMP server is unable to poll data from a BIG-IP device.
What information will help the BIG-IP Administrator determine whether the issue originates from the BIG-IP system?
- A. The "Port Lockdown" setting is preventing the SNMP server from polling data from the BIG-IP.
- B. The configuration on the exhibit is correct and other options should be explored.
- C. The "Traffic Group" setting must use a floating Traffic Group.
- D. The "VLAN / Tunnel" setting must allow All Vlans.
Answer: A
Explanation:
The exhibit shows a Self IP with:
VLAN: Data
Port Lockdown: Allow None
Impact of "Allow None" on SNMP
When a Self IP is configured with:
Port Lockdown: Allow None
the BIG-IP blocks all services and ports except a few hardcoded HA communication ports.
This means:
UDP/161 (SNMP) is blocked
UDP/162 (SNMP traps) is blocked
The SNMP server cannot poll or receive data from the BIG-IP through this Self IP SNMP relies on access through the Self IP if out-of-band (mgmt interface) is not used.
Thus, the issue is directly caused by Port Lockdown = Allow None, which prevents SNMP communication.
NEW QUESTION # 21
When using the tmsh shell of a BIG-IP system, which command will display the management-ip address?
- A. list /sys management-ip
- B. show /sys management-ip
- C. run /util bash ifconfig mgmt
Answer: A
Explanation:
Comprehensive and Detailed Explanation (Paraphrased from F5 BIG-IP Administration / Installation / Initial Configuration concepts) Within the BIG-IP Traffic Management Shell (tmsh), system configuration objects-including the management IP-are organized under the/syshierarchy. The management IP address is a configurable property stored in the system configuration and can be viewed using the tmshlistcommand, which displays configuration objects and their currently assigned values.
Why "list /sys management-ip" is correct
* The list command in tmsh is used todisplay configured system values, not runtime statistics.
* The object that holds the management IP settings on BIG-IP systems is located at:/sys management-ip
* Running the command:list /sys management-ipwill reveal the settings for the management IP interface, including the address, netmask, and any associated attributes.
* This is the standard method used during system setup and verification to confirm the management IP configuration.
This behavior aligns with BIG-IP administration procedures, where configuration information is retrieved usinglist, while operational data is retrieved usingshow.
Why the other options are incorrect
A). run /util bash ifconfig mgmt
* This command enters the Bash shell, then runs ifconfig to display the management interface.
* While this can show the management interface address, it isnot a tmsh-native command, and the question specifically asks for a tmsh command.
* Administrators use tmsh directly for configuration display rather than leaving the shell.
C). show /sys management-ip
* The show command displaysstatistics or operational data, not configuration values.
* The management-ip object does not maintain statistics; therefore show does not return the configuration details required.
* Only thelistcommand reveals stored configuration data such as IP address and netmask.
NEW QUESTION # 22
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.)
- A. F5 University
- B. F5 End User Diagnostics (EUD)
- C. F5 iHealth
- D. F5 Bug Tracker
- E. F5 Downloads
Answer: C,D
Explanation:
When performing a TMOS upgrade, F5 recommends validating the target software version to ensure that the release does not contain defects that may impact system behavior. The upgrade preparation process includes checking for known issues, validating compatibility, and reviewing advisory information for the intended version. Two primary F5 tools serve this purpose:
B). F5 iHealth
iHealth is a cloud-based diagnostic and analysis platform used to evaluate the operational state of a BIG-IP system.
Administrators upload a QKView file to iHealth to receive an automated assessment of the system. As part of upgrade planning, iHealth provides:
* Version-specific issue analysis , comparing the system's configuration and hardware against F5's internal catalog of published issues.
* Upgrade advisories , identifying potential risks such as deprecated features, module compatibility concerns, or changes in behavior between TMOS versions.
* Checks against known defects , allowing administrators to determine whether the target TMOS version contains issues relevant to their deployment.
This aligns with F5's recommended upgrade workflow, where iHealth is used before upgrading to confirm system readiness and detect software-level concerns.
D). F5 Bug Tracker
The Bug Tracker is F5's dedicated interface for reviewing software defects across TMOS releases.
It enables administrators to:
* Search for known bugs by TMOS version , module, severity, or defect ID.
* Review the status of defects (open, resolved, fixed in later releases).
* Identify whether high-impact or security-related issues are associated with the target upgrade version.
F5 documentation emphasizes reviewing known defects prior to installation of new software images, making the Bug Tracker a critical resource for upgrade validation.
Why the other options are not correct
A). F5 End User Diagnostics (EUD)
EUD is used exclusively for hardware diagnostics (ports, memory, fans). It does not provide software- related issue verification and is not used for upgrade planning.
C). F5 University
This is a training platform , not an operational tool. It does not provide defect listings or upgrade-specific warnings.
E). F5 Downloads
Although it provides access to software images and release notes, it is not a tool for identifying known bugs
. Release notes summarize general fixes and features, but systematic bug verification requires iHealth or the Bug Tracker.
NEW QUESTION # 23
Which of the following are resource allocation settings for modules? (Pick the 2 correct responses below)
- A. Limited
- B. Dedicated
- C. Maximum
- D. Nominal
Answer: B,D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration - Install, Initial Configuration, and Upgrade:
When provisioning modules on a BIG-IP system, F5 provides specific resource allocation settings that define how system resources - CPU, memory, and disk - are distributed to each licensed module. The two valid and officially recognised allocation settings are Nominal and Dedicated .
Nominal instructs the system to allocate a moderate, balanced share of resources to the module. It allows the module to function effectively while sharing system resources with other provisioned modules. This is the most commonly used setting in multi-module deployments.
Dedicated allocates the maximum available system resources exclusively to a single module. When this setting is applied, it is typically the only module provisioned, as it consumes resources at a level that prevents other modules from operating concurrently in a meaningful capacity.
Option A - Maximum is not a valid BIG-IP provisioning allocation level; it does not appear in the official provisioning interface or documentation as a selectable resource tier.
Option C - Limited similarly does not exist as a defined resource allocation setting within BIG-IP module provisioning. It may superficially resemble valid terminology but has no standing in the official provisioning framework.
Administrators access these settings via System > Resource Provisioning in the Configuration Utility, where each licensed module displays its available allocation options.
Reference Topics: Module Resource Provisioning, Nominal vs. Dedicated Allocation, System Resource Management - BIG-IP Administration Study Guide.
NEW QUESTION # 24
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 # 25
A BIG-IP Administrator needs to install a HotFix on a standalone BIG-IP device, which hasHD1.1as the Active Boot Location.
The administrator has already re-activated the license and created a UCS archive.
In which sequence should the administrator perform the remaining steps?
- A. Activate HD1.2, Install base Image in HD1.2, Install HotFix in HD1.2
- B. Install base Image in HD1.2, Install HotFix in HD1.2, Activate HD1.2
- C. Install HotFix in HD1.1, Reboot the BIG-IP device, Install UCS Archive
- D. Install HotFix in HD1.2, Install base Image in HD1.2, Activate HD1.2
Answer: B
Explanation:
When installing a HotFix on a BIG-IP device, F5 best practices require:
* Installing the base TMOS image on a new, unused boot volume (HD1.2)
* This ensures the upgrade happens on a clean volume.
* The existing active boot location remains untouched for rollback.
* Installing the HotFix onto the SAME new boot volume (HD1.2)
* HotFixes must be applied on top of a base version.
* They cannot be installed on an empty volume.
* They must match the base image version.
* Activating the new boot volume (HD1.2)
* The system reboots into the updated software stack.
* Activation happensafterbase + HotFix installation is complete.
This sequence is exactly shown inOption C:
Install base Image in HD1.2
Install HotFix in HD1.2
Activate HD1.2
Why the other options are incorrect:
A). Install HotFix before base image
* Impossible.
* HotFix requires an installed base version first.
B). Installing HotFix on HD1.1 (active boot volume)
* Not recommended.
* Upgrading in-place removes rollback safety.
* HotFix cannot be applied cleanly without applying base image first.
D). Activate HD1.2 before installing anything
* You cannot activate an empty boot volume.
* Activation only occurs after the base + HotFix software is installed.
NEW QUESTION # 26
Which of the following is true about High Availability (HA) in BIG-IP?
- A. In HA, one BIG-IP system is in active mode, and the other is in standby mode
- B. HA setup ensures both systems actively share traffic
- C. HA is only used for SSL offloading
- D. HA requires no additional configuration
Answer: A
Explanation:
In a High Availability (HA) setup, one BIG-IP unit is actively serving traffic while the other is in standby mode, ready to take over in case of a failure.
NEW QUESTION # 27
What should you do before performing a software upgrade on BIG-IP?
- A. Make a backup of the configuration
- B. Delete unused routes
- C. Shut down all virtual servers
- D. Deactivate all SSL certificates
Answer: A
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 # 28
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