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NEW QUESTION # 22
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 -I HD1.2, then reboot
- C. Use tmsh to select a new boot volume, tmsh switchboot HD1.2
- D. switchboot -b HD1.2, then reboot
Answer: D
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 # 23
Given thatBIGIP-<version>.isoandHotfix-BIGIP-<version>-ENG.isohave been uploaded to/shared/images on an F5 device, what is the appropriatetmshcommand to prepare and update the BIG-IP device with the hotfixof a software version on anew volume HD1.2?
(Choose one.)
- A. tmsh copy /sys software hotfix Hotfix-BIGIP-<version>-ENG.iso volume HD1.2
- B. tmsh create /sys software hotfix Hotfix-BIGIP-<version>-ENG.iso volume HD1.2
- C. tmsh install /sys software hotfix Hotfix-BIGIP-<version>-ENG.iso create-volume HD1.2
- D. tmsh install /sys software BIGIP-<version>.iso hotfix Hotfix-BIGIP-<version>-ENG.iso create-volume HD1.2
Answer: D
Explanation:
When installing a BIG-IP software versionwith a HotFixon anew boot volume, F5 requires that both thebase TMOS imageand theHotFix imagebe installed together as part of the same installation workflow.
The correct process is:
* Specify thebase TMOS ISO
* Specify theHotFix ISOthat corresponds to that base version
* Instruct the system tocreate a new boot volume
* Install both images into that new volume
This is achieved with the following tmsh syntax:
tmsh install /sys software BIGIP-<version>.iso hotfix Hotfix-BIGIP-<version>-ENG.iso create-volume HD1.2 This command:
* Installs the base image first
* Applies the HotFix on top of the base image
* Creates and installs everything onHD1.2
* Leaves the currently active volume untouched for rollback
Why the other options are incorrect
A). Installing only the hotfix
A HotFix cannot be installed by itself on a new volume. A base image must already be present.
C). Using create instead of install
The create keyword is not valid for software installation operations.
D). Using copy
The copy command does not install software images or hotfixes.
NEW QUESTION # 24
Which one of the following is aport and protocol combination allowedby theAllow Defaultsetting for Port Lockdown?
- A. UDP 8443
- B. TCP 443
- C. TCP 80
Answer: B
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 # 25
A BIG-IP Administrator is using Secure Copy Protocol (SCP) to transfer a TMOS image to the BIG-IP system in preparation for an upgrade.
To what directory should the file be transferred?
- A. /shared/images/
- B. /local/images/
- C. /var/images/
Answer: A
Explanation:
BIG-IP systems require all ISO images (base TMOS images and HotFix images) to be stored in a specific directory used for software installation:
/shared/images/
This directory:
* Is theonly supported locationfrom which the BIG-IP software installation system validates and installs ISO files
* Is accessible by both the GUI and TMSH installers
* Has adequate storage space allocated specifically for images
* Is part of the shared partition that persists across reboots
When transferring images via SCP, the administrator must copy them directly into/shared/images/so that:
* The GUI (System # Software Management # Available Images) can detect the image
* TMSH install software image commands can reference it
Other directories such as/local/images/or/var/images/are not valid storage paths for software images.
NEW QUESTION # 26
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 "VLAN / Tunnel" setting must allow All Vlans.
- B. The configuration on the exhibit is correct and other options should be explored.
- C. The "Port Lockdown" setting is preventing the SNMP server from polling data from the BIG-IP.
- D. The "Traffic Group" setting must use a floating Traffic Group.
Answer: C
Explanation:
The exhibit shows aSelf IPwith:
* 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 blocksallservices 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 byPort Lockdown = Allow None, which prevents SNMP communication.
Why the other options are incorrect:
B). Traffic Group must use a floating Traffic Group
* SNMP polling doesnotrequire floating Self IPs.
* Floating groups apply to HA failover IPs, not SNMP functionality.
C). VLAN/Tunnel must allow All VLANs
* Self IPs are always bound to a VLAN; SNMP doesnotrequire All VLANs.
* As long as the Self IP belongs to a reachable VLAN, SNMP can work.
D). Configuration is correct
* It is not correct:Allow Noneblocks SNMP and is the problem.
NEW QUESTION # 27
When is theLicense Service Check Dateenforced on a BIG-IP system?
- A. After editing a virtual server
- B. During system startup
- C. During a software install
Answer: C
Explanation:
TheService Check Datedetermines whether a particular software version is allowed to run under the device's license.
* When installing or upgrading TMOS, the installer checks theService Check Datestored in the BIG-IP license file.
* If the license date isolderthan the minimum required for the target version, the software installation is blocked.
* This check happensspecifically during a software install, not during routine device operations.
Editing virtual servers or system startup do not trigger this validation.
Thus, the enforcement happensduring software installation.
NEW QUESTION # 28
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 "VLAN / Tunnel" setting must allow All Vlans.
- B. The configuration on the exhibit is correct and other options should be explored.
- C. The "Port Lockdown" setting is preventing the SNMP server from polling data from the BIG-IP.
- D. The "Traffic Group" setting must use a floating Traffic Group.
Answer: C
Explanation:
The exhibit shows aSelf IPwith:
* 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 blocksallservices 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 byPort Lockdown = Allow None, which prevents SNMP communication.
Why the other options are incorrect:
B). Traffic Group must use a floating Traffic Group
* SNMP polling doesnotrequire floating Self IPs.
* Floating groups apply to HA failover IPs, not SNMP functionality.
C). VLAN/Tunnel must allow All VLANs
* Self IPs are always bound to a VLAN; SNMP doesnotrequire All VLANs.
* As long as the Self IP belongs to a reachable VLAN, SNMP can work.
D). Configuration is correct
* It is not correct:Allow Noneblocks SNMP and is the problem.
NEW QUESTION # 29
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. callhome.f5.com
- B. license.f5.com
- C. ask.f5.com
- D. activate.f5.com
Answer: D
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 # 30
When logged into thebash shellof a BIG-IP system, which of the following commands will display the management-ip address?
(Choose two.)
- A. tmsh list /sys management-ip
- B. show mgmt ip
- C. ifconfig mgmt
- D. list / sys management-ip
Answer: A,C
Explanation:
When logged into thebash shellof a BIG-IP system, there are two valid ways to view themanagement-ip address:
A). tmsh list /sys management-ip
* Even from the bash shell, the administrator can enter a tmsh command by typing:
* tmsh list /sys management-ip
* This displays:
* Management IP address
* Netmask
* Any configured management routes
* This is theofficial tmsh methodfor viewing the management-ip configuration.
C). ifconfig mgmt
* In the underlying Linux OS, the management interface maps to themgmtinterface.
* Running:
* ifconfig mgmt
displays:
* Assigned management IP
* Netmask
* Link-level status
* This is a valid Linux-level method used frequently for troubleshooting.
Why the other options are incorrect:
B). show mgmt ip
* Not a valid bash or tmsh command on BIG-IP.
D). list / sys management-ip
* Missing thetmshprefix.
* In bash, this will generate a syntax error.
* The correct form requires:
tmsh list /sys management-ip
NEW QUESTION # 31
What are the two options for securing a BIG-IP's management interface?
(Choose two.)
- A. Restrict administrative HTTPS and SSH access to specific IP addresses or IP ranges.
- B. Block all management-interface administrative HTTPS and SSH service ports to prevent access.
- 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: A,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 adedicated, 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 allowlist (for HTTPS) and configuration options insshd(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.
Why the other options are incorrect
B). Blocking all management HTTPS/SSH ports
* This would prevent any administrative access and is not a viable security practice.
C). Using Self-IP addresses for administrative access
* F5 explicitly warns against using Self-IPs for management access unless strictly necessary.
* Self-IPs are exposed to the data plane and should not be used as the primary administrative interface.
NEW QUESTION # 32
The BIG-IP Administrator received a ticket that an authorized user is attempting to connect to the Configuration Utility from a jump host and is being denied.
The HTTPD allow list is configured as:
sys httpd {
allow { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
}
The jump host IP is172.28.32.22.
What command should the BIG-IP Administrator use to allow HTTPD access for this jump host?
- A. modify /sys httpd allow add { 172.28.32.22 }
- B. modify /sys httpd allow replace-all-with { 172.28.32.22 }
- C. modify /sys httpd allow delete { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
Answer: A
Explanation:
The HTTPD allow list controls which IP addresses or subnets may access the Configuration Utility (TMUI) on the BIG-IP system. The Administrator already has two subnets allowed and needs to add asingle host IPto the existing list.
* The object/sys httpd allowsupports actions such asadd,delete, andreplace-all-with.
* Because the goal is toaddone more entry without removing the existing permitted subnets, the correct command is:
modify /sys httpd allow add { 172.28.32.22 }
This appends the new host to the existing list while preserving the previously configured networks.
Why the other options are incorrect:
* Option A (replace-all-with)wouldoverwritethe entire allow list, removing existing permitted subnets- unacceptable.
* Option B (delete)wouldremovethe existing networks and not add the required host.
Therefore, the correct administrative action is toaddthe jump host's IP.
NEW QUESTION # 33
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 performs a reboot into a new partition
- C. The system copies the image to /var/local/images/
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 # 34
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 OVSDB
- C. Configuration Device
- D. Resource Provisioning
Answer: D
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 # 35
The Port Lockdown feature prevents unwanted connection attempts to a Self IP.
Which three types of connection attempts areunaffectedby Port Lockdown settings?
- A. Centralized Management Infrastructure (CMI), Secure Shell (SSH), Internet Control Message Protocol (ICMP)
- B. Defined virtual server traffic, Secure Shell (SSH), Centralized Management Infrastructure (CMI)
- C. Defined virtual server traffic, Internet Control Message Protocol (ICMP), Centralized Management Infrastructure (CMI)
Answer: C
Explanation:
Port Lockdown controls which ports and protocols aSelf IPwill respond to.
However, certain traffic types bypass Port Lockdown for BIG-IP functionality and routing integrity.
The three types that areNOT affectedby Port Lockdown are:
1. Defined Virtual Server Traffic
Traffic destined to a Self IP that matches aconfigured virtual serveris always accepted by the BIG-IP, regardless of Port Lockdown settings.
This ensures that traffic processing does not break when administrators restrict Self-IP ports.
2. ICMP (Internet Control Message Protocol)
ICMP (such as ping, traceroute responses, etc.) always passes through a Self IP even when Port Lockdown is set to:
* Allow Default
* Allow None
* Allow Custom
F5 allows ICMP for reachability and diagnostic purposes independent of Port Lockdown rules.
3. Centralized Management Infrastructure (CMI)
CMI includes the internal HA services used for:
* Device Trust
* ConfigSync
* Failover
* Mirroring
These essential HA communications bypass Port Lockdown to prevent accidental cluster failure.
The well-known port for this traffic isTCP 4353, which is always permitted.
Why the other options are incorrect:
Option A:SSHisrestricted by Port Lockdown unless explicitly allowed.
Option B:Same issue - SSH does not bypass Port Lockdown.
OnlyDefined VS Traffic,ICMP, andCMIbypass Port Lockdown.
NEW QUESTION # 36
Which of the following areresource allocation (provisioning) settingsfor BIG-IP modules?
(Choose two.)
- A. Dedicated
- B. Nominal
- C. Limited
- D. Maximum
Answer: A,B
Explanation:
BIG-IP module provisioning determines howCPU, memory, and disk resourcesare allocated to each licensed module. F5 defines a specific set of supported provisioning levels.
Valid provisioning (resource allocation) settings
Nominal
* Allocates a standard, balanced amount of system resources to a module.
* Intended for typical production deployments where multiple modules may be provisioned at the same time.
Dedicated
* Allocatesall available system resourcesto a single module.
* Used when the BIG-IP device is dedicated to running only one module (for example, ASM-only or APM-only deployments).
* No other modules can be provisioned when one is set to Dedicated.
These two options are valid and supported provisioning levels.
Why the other options are incorrect
Maximum
* This is not a valid BIG-IP provisioning level.
* BIG-IP does not use "Maximum" as a resource allocation setting.
Limited
* This is also not a supported provisioning level.
* BIG-IP uses levels such as None, Minimal, Nominal, and Dedicated (module-dependent), not Limited.
NEW QUESTION # 37
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)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0/24 10.53.1.245 http) (deny ip any any http) }
- C. (tmos)# modify /sys httpd allow replace-all-with {10.0.0.0/24}
- D. (tmos)# modify /ltm httpd allow replace-all-with {10.0.0.0/24}
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 # 38
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F5 F5CAB1 Exam Syllabus Topics:
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