F5 F5CAB1 Cert Guide PDF 100% Cover Real Exam Questions
Pass F5CAB1 Exam - Real Questions and Answers
NEW QUESTION # 31
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
- A. TCP 4353
- B. UDP 53
- C. TCP 443
Answer: A
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 # 32
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. Reset the Device Trust, apply the update to each node separately, reboot both nodes, then re-establish the Device Trust.
- 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. Update both nodes in the HA pair, then reboot both nodes simultaneously to ensure they run the same software version.
- D. 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.
Answer: B
Explanation:
For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizesservice continuity, predictable failover, andminimal downtime. The established best-practice sequence is:
* Upgrade the standby unit first
* Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
* Boot the standby unit into the newly installed version
* Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
* Perform a controlled failover to the upgraded unit
* Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
* Upgrade the second device (now standby)
* The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
OptionCexactly matches F5's documented production-safe upgrade method:
* Upgrade thestandbynode first
* Reboot into new image
* Failover to upgraded device
* Validate
* Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.
Why the other options are incorrect:
A). Upgrade the active node first
* Upgrading the active device requires removing it from service and failing over abruptly. This is not recommended and increases service disruption risk.
B). Resetting device trust
* Resetting trust is unnecessary and can disrupt configuration sync, peer communication, and cluster operation. It is not part of any standard upgrade workflow.
D). Upgrading and rebooting both nodes simultaneously
* This would causetotal outage, because both HA members would be unavailable at the same time.
NEW QUESTION # 33
The Port Lockdown feature prevents unwanted connection attempts to a Self IP. Which three types of connection attempts are unaffected by Port Lockdown settings?
- A. Centralized Management Infrastructure (CMI), Secure Shell (SSH), Internet Control Message Protocol (ICMP)
- B. Defined virtual server traffic, Internet Control Message Protocol (ICMP), Centralized Management Infrastructure (CMI)
- C. Defined virtual server traffic, Secure Shell (SSH), Centralized Management Infrastructure (CMI)
Answer: B
Explanation:
Port Lockdown controls which ports and protocols a Self IP will respond to.
However, certain traffic types bypass Port Lockdown for BIG-IP functionality and routing integrity.
The three types that are NOT affected by Port Lockdown are:
1. Defined Virtual Server Traffic
Traffic destined to a Self IP that matches a configured virtual server is 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 is TCP 4353, which is always permitted.
NEW QUESTION # 34
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 do before the 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
NEW QUESTION # 35
Which of the following areresource allocation (provisioning) settingsfor BIG-IP modules?
(Choose two.)
- A. Limited
- B. Nominal
- C. Dedicated
- D. Maximum
Answer: B,C
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 # 36
Given that BIGIP- < version > .iso and Hotfix-BIGIP- < version > -ENG.iso have been uploaded to /shared
/images on an F5 device, what is the appropriate tmsh command to prepare and update the BIG-IP device with the hotfix of a software version on a new volume HD1.2 ?
(Choose one.)
- A. tmsh install /sys software hotfix Hotfix-BIGIP- < version > -ENG.iso create-volume HD1.2
- B. tmsh install /sys software BIGIP- < version > .iso hotfix Hotfix-BIGIP- < version > -ENG.iso create- volume HD1.2
- C. tmsh copy /sys software hotfix Hotfix-BIGIP- < version > -ENG.iso volume HD1.2
- D. tmsh create /sys software hotfix Hotfix-BIGIP- < version > -ENG.iso volume HD1.2
Answer: B
Explanation:
When installing a BIG-IP software version with a HotFix on a new boot volume , F5 requires that both the base TMOS image and the HotFix image be installed together as part of the same installation workflow.
The correct process is:
* Specify the base TMOS ISO
* Specify the HotFix ISO that corresponds to that base version
* Instruct the system to create 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 on HD1.2
* 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 # 37
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 # 38
The BIG-IP Administrator wants to manage the newly built F5 system through an in-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 via SSH or HTTPS.
What port lockdown settings 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 to Allow All
- B. The Self-IP port lockdown behavior could be adjusted to Allow Mgmt
- C. The Self-IP port lockdown behavior could be adjusted to Allow Management
- D. The Self-IP port lockdown behavior could be adjusted to Allow Default
Answer: B,C
Explanation:
Self-IPs include a security feature called Port 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 do not expose all services, reducing the attack surface.
NEW QUESTION # 39
Which one of the following is a port and protocol combination allowed by the Allow Default setting for Port Lockdown?
- A. UDP 8443
- B. TCP 443
- C. TCP 80
Answer: B
Explanation:
Port Lockdown controls which ports and protocols a Self IP will respond to.
The Allow Default setting permits only a predefined set of BIG-IP internal and required service ports.
The Allow Default list includes:
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 under Allow Default.
It enables HTTPS/TMUI access through a Self IP.
NEW QUESTION # 40
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. /local/images/
- B. /var/images/
- C. /shared/images/
Answer: C
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 # 41
Which configuration file can a BIG-IP administrator use to verify theprovisioned modules?
- A. /config/bigip.conf
- B. /config/bigip_base.conf
- C. /config/bigip.license
- D. /var/local/ucs/config.ucs
Answer: A
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 # 42
When logged into the bash shell of a BIG-IP system, which of the following commands will display the management-ip address? (Choose two.)
- A. tmsh list /sys management-ip
- B. list / sys management-ip
- C. ifconfig mgmt
- D. show mgmt ip
Answer: A,C
Explanation:
When logged into the bash shell of a BIG-IP system, there are two valid ways to view the management-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 the official tmsh method for viewing the management-ip configuration.
C). ifconfig mgmt
In the underlying Linux OS, the management interface maps to the mgmt interface.
Running:
ifconfig mgmt
displays:
Assigned management IP
Netmask
Link-level status
This is a valid Linux-level method used frequently for troubleshooting.
NEW QUESTION # 43
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
Answer: B
Explanation:
Within the BIG-IP Traffic Management Shell (tmsh), system configuration objects--including the management IP--are organized under the /sys hierarchy. The management IP address is a configurable property stored in the system configuration and can be viewed using the tmsh list command, which displays configuration objects and their currently assigned values.
Why "list /sys management-ip" is correct
The list command in tmsh is used to display 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-ip
will 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 using list, while operational data is retrieved using show.
NEW QUESTION # 44
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 is 172.28.32.22.
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 a single host IP to the existing list.
The object /sys httpd allow supports actions such as add, delete, and replace-all-with.
Because the goal is to add one 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.
NEW QUESTION # 45
A BIG-IP device is licensed forLTM, ASM, APM, and AFM.
Currently, it will only be used forload balancingandweb application firewalling.
To ensure optimal performance and efficient resource utilization, which of the following module provisioning combinations is the best choice?
- A. LTM: Nominal
ASM: Nominal
APM: Minimal
AFM: Minimal - B. LTM: Nominal
ASM: Nominal
APM: None
AFM: None - C. LTM: Dedicated
ASM: Dedicated
APM: Minimal
AFM: Minimal - D. LTM: Dedicated
ASM: Dedicated
APM: None
AFM: None
Answer: B
Explanation:
BIG-IP provisioning determines how CPU, memory, and disk resources are allocated to each module. The goal is to provision only the modules required and at levels appropriate to their performance needs.
Requirements in the question
The device will be used for:
* LTM(Local Traffic Manager) # load balancing
* ASM(Application Security Manager) # WAF
No functions require:
* APM (Access Policy Manager)
* AFM (Advanced Firewall Manager)
Why Option C is correct
Provisioning bothLTMandASMatNominallevel provides:
* Adequate performance for production load
* Plentiful system resources while avoiding dedicating the entire system to a single module
* Balanced allocation without starving memory or CPU
SettingAPM: NoneandAFM: Noneensures unused modules consume zero resources.
Why the other options are incorrect
A). Dedicated provisioning for both LTM and ASM
* Two modules cannot both run in "Dedicated" mode.
* Dedicated mode allocatesallresources to a single module - the second module cannot be dedicated simultaneously.
B). LTM and ASM both Dedicated
* Same issue: only one module can be Dedicated at a time.
* Also unnecessary for load balancing + WAF.
D). Setting APM and AFM to Minimal
* Minimal still consumes memory and CPU.
* Unused modules should be set toNone.
Therefore,Option Cis the best provisioning strategy.
NEW QUESTION # 46
What are the two options for securing a BIG-IP's management interface? (Choose two.)
- A. Use the BIG-IP's Self-IP addresses for administrative access rather than the management interface.
- B. Restrict administrative HTTPS and SSH access to specific IP addresses or IP ranges.
- C. Block all management-interface administrative HTTPS and SSH service ports to prevent access.
- 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 # 47
How should the BIG-IP Administrator block connections to a Self IP on port 443 while allowing connections to other ports?
- A. In the Configuration Utility, select Network > Self IPs. Select the Self IP in question, then select ' Disable ' .
- B. In the Configuration Utility, go to Network > Self IPs. Select the Self IP in question, then select ' Port Lockdown ' and ' Allow Custom ' . Enter in only the allowed ports to that Self IP address.
- C. In the Configuration Utility, select System > Platform > SSH Allow. Enter the IP addresses of the clients allowed to connect to the Self IPs.
- D. In the Configuration Utility, go to Network > Self IPs. Select the Self IP in question, then select ' Port Lockdown ' and ' Allow None ' .
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration - Install, Initial Configuration, and Upgrade:
BIG-IP Self IP addresses have an associated Port Lockdown feature that governs which protocols and services are permitted to communicate directly with that Self IP. By default, Self IPs may allow broader access than desired, making Port Lockdown a critical hardening control.
The Allow Custom option under Port Lockdown is the precise mechanism for administrators who need granular, port-specific filtering. When selected, only the explicitly listed TCP/UDP ports are permitted - all others, including port 443 (HTTPS), are implicitly denied. This satisfies the requirement of blocking 443 specifically while preserving access on other required ports.
The remaining options are incorrect for this scenario:
* Option A references SSH access control under System > Platform, which governs management-plane SSH - not Self IP service filtering.
* Option B disables the entire Self IP, removing all traffic handling, which is operationally disruptive.
* Option D - Allow None - blocks all traffic to the Self IP, not selectively port 443.
The Allow Custom approach provides the surgical precision required: administrators enumerate permitted ports, and everything outside that list - including 443 - is dropped.
Reference Topics: Self IP Port Lockdown, Network Security Hardening, Self IP Configuration - BIG-IP Administration Study Guide.
NEW QUESTION # 48
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