[2025年12月]更新のF5CAB1問題集には100%厳密検証された問題と解答で合格保証もしくは全額返金 [Q20-Q45]

[2025年12月]更新のF5CAB1問題集には100%厳密検証された問題と解答で合格保証もしくは全額返金

合格させるF5 F5CAB1試験には練習テスト問題集豪華お試しセット

質問 # 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 configuration on the exhibit is correct and other options should be explored.
B. The "Traffic Group" setting must use a floating Traffic Group.
C. The "Port Lockdown" setting is preventing the SNMP server from polling data from the BIG-IP.
D. The "VLAN / Tunnel" setting must allow All Vlans.

正解：C

解説：
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.

質問 # 21
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?

A. TCP 443
B. TCP 4353
C. UDP 53

正解：B

解説：
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.

質問 # 22
An F5 BIG-IP Administrator is asked to report which modules areprovisionedon the BIG-IP.
In which two ways can this be done?
(Choose two.)

A. Via TMSH withlist /sys provision
B. Via the GUI atSystem # Resource Provisioning # Module Allocation
C. Via the GUI atStatistics # Module Statistics # System
D. Via TMSH withshow /sys provision

正解：A、B

解説：
Provisioning determines:
* Which BIG-IP modules are enabled (LTM, ASM, APM, AFM, DNS, etc.)
* Their provisioning levels (None, Minimal, Nominal, Dedicated)
Two accurate ways to view provisioning settings are:
A). GUI - System # Resource Provisioning # Module Allocation
This is the primary GUI screen showing:
* All modules
* Their provisioning level
* System resource distribution impact
Administrators commonly use this page to confirm or change module provisioning.
D). TMSH - list /sys provision
This tmsh command displays each module and its provisioning level:
sys provision ltm { level nominal }
sys provision asm { level none }
This is the authoritative CLI method for checking module provisioning configurations.
Why the other options are incorrect:
B). show /sys provision
* Showsruntimeinformation butnot the actual configuration levels.
* list is the correct command for configuration details.
C). Statistics # Module Statistics
* Shows performance statistics, NOT provisioning status.
Therefore, the correct responses areAandD.

質問 # 23
The BIG-IP Administrator needs to update access to the Configuration Utility to include the172.28.31.0/24and
172.28.65.0/24networks.
From the TMOS Shell (tmsh), which command should the BIG-IP Administrator use to complete this task?

A. modify /sys httpd allow add { 172.28.31.0 172.28.65.0 }
B. modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
C. modify /sys httpd permit add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }

正解：B

解説：
Access to the BIG-IP Configuration Utility (TMUI) is controlled through the/sys httpd allowlist.
This list defines which IP addresses or subnets are allowed to connect to the management web interface.
To allow two new subnets-172.28.31.0/24and172.28.65.0/24-the administrator mustaddboth subnets to the existing list without removing current entries.
In tmsh, subnet entries must be specified innetwork/netmask format, for example:
172.28.31.0/255.255.255.0
The correct tmsh command to append these networks is:
modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 } Why the other options are incorrect:
Option B:
* IPs are listed without masks, which is invalid for subnet-based access control.
* The system requiresnetwork/netmaskformat.
Option C:
* The command uses permit instead of allow, which is not a valid attribute of /sys httpd.
* The correct keyword must beallow.
Thus, onlyOption Acorrectly adds both permitted subnets in the proper tmsh format.

質問 # 24
Which one of the following is aport and protocol combination allowedby theAllow Defaultsetting for Port Lockdown?

A. TCP 80
B. TCP 443
C. UDP 8443

正解：B

解説：
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

質問 # 25
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 dobeforethe image appears in the GUI under:
System Software Management Image List?

A. The system verifies the internal checksum
B. The system copies the image to /var/local/images/
C. The system performs a reboot into the new partition

正解：A

解説：
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 systemverifies the internal checksumembedded 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 isnotused for ISO storage.
* All valid images remain in/shared/images/.
Thus, the correct system action ischecksum verification.

質問 # 26
The BIG-IP Administrator needs to update access to the Configuration Utility to include the172.28.31.0/24and
172.28.65.0/24networks.
From the TMOS Shell (tmsh), which command should the BIG-IP Administrator use to complete this task?

A. modify /sys httpd allow add { 172.28.31.0 172.28.65.0 }
B. modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
C. modify /sys httpd permit add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }

正解：B

質問 # 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 verifies the internal checksum
B. The system copies the image to /var/local/images/
C. The system performs a reboot into a new partition

正解：A

解説：
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.

質問 # 28
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. switchboot -I HD1.2, then reboot
D. Use tmsh to select a new boot volume, tmsh switchboot HD1.2

正解：B

解説：
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.

質問 # 29
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.

正解：C

解説：
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.

質問 # 30
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. After the maintenance window.
B. During the maintenance window.
C. Before the maintenance window.

正解：C

解説：
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.

質問 # 31
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 All
B. The Self-IP port lockdown behavior could be adjusted toAllow Mgmt
C. The Self-IP port lockdown behavior could be adjusted toAllow Management
D. The Self-IP port lockdown behavior could be adjusted toAllow Default

正解：B、C

解説：
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.

質問 # 32
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. Configuration OVSDB
B. Resource Provisioning
C. Configuration Device
D. Software Management

正解：B

解説：
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.

質問 # 33
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

正解：B

解説：
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.

質問 # 34
When logged into thebash shellof a BIG-IP system, which of the following commands will display the management-ip address?
(Choose two.)

A. list / sys management-ip
B. ifconfig mgmt
C. tmsh list /sys management-ip
D. show mgmt ip

正解：B、C

解説：
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

質問 # 35
Which configuration file can a BIG-IP administrator use to verify theprovisioned modules?

A. /var/local/ucs/config.ucs
B. /config/bigip.license
C. /config/bigip.conf
D. /config/bigip_base.conf

正解：C

解説：
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.

質問 # 36
When using the tmsh shell of a BIG-IP system, which command will display the management-ip address?

A. show /sys management-ip
B. list /sys management-ip
C. run /util bash ifconfig mgmt

正解：B

解説：
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.

質問 # 37
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 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.
B. 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.
C. Reset the Device Trust, apply the update to each node separately, reboot both nodes, then re-establish the Device Trust.
D. Update both nodes in the HA pair, then reboot both nodes simultaneously to ensure they run the same software version.

正解：B

解説：
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.

質問 # 38
......

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