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The BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) certification is the way to go in the modern F5 era. Success in the F5CAB1 exam of this certification plays an essential role in an individual's future growth. Nowadays, almost every tech aspirant is taking the test to get F5 certification and find well-paying jobs or promotions. But the main issue that most of the candidates face is not finding updated F5 F5CAB1 Practice Questions to prepare successfully for the F5 F5CAB1 certification exam in a short time.
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NEW QUESTION # 37
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.)
Answer: C,E
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.
NEW QUESTION # 38
Refer to the exhibit.
What traffic will be permitted to reach the BIG-IP?
Answer: C
Explanation:
The exhibit shows the configuration of a Self IP with:
* Port Lockdown: Allow Custom
* A Custom List that includes the following TCP ports:
* 443
* 22
Meaning of these ports:
* TCP 443 # HTTPS (TMUI - web-based management)
* TCP 22 # SSH (command-line remote access)
No other TCP, UDP, or protocol entries are listed; therefore, only these two services are allowed to reach the BIG-IP via this Self IP.
Evaluating the answer choices:
Option
Service
Port
Allowed?
FTP
TCP 21
Not listed
Not allowed
SSH
TCP 22
Listed
Allowed
Telnet
TCP 23
Not listed
Not allowed
Thus, SSH is the only traffic permitted through this Self IP configuration.
NEW QUESTION # 39
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?
Answer: B
Explanation:
For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizes service continuity
, predictable failover , and minimal downtime . The established best-practice sequence is:
* Upgrade the standby unit first
* Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
* Boot the standby unit into the newly installed version
* Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
* Perform a controlled failover to the upgraded unit
* Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
* Upgrade the second device (now standby)
* The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
Option C exactly matches F5's documented production-safe upgrade method:
* Upgrade the standby node first
* Reboot into new image
* Failover to upgraded device
* Validate
* Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.
Why the other options are incorrect:
A). Upgrade the active node first
* Upgrading the active device requires removing it from service and failing over abruptly. This is not recommended and increases service disruption risk.
B). Resetting device trust
* Resetting trust is unnecessary and can disrupt configuration sync, peer communication, and cluster operation. It is not part of any standard upgrade workflow.
D). Upgrading and rebooting both nodes simultaneously
* This would cause total outage , because both HA members would be unavailable at the same time.
NEW QUESTION # 40
An F5 VE has been deployed into a VMware environment via an OVF file.
An administrator wants to configure the management IP address so the VE can be accessed for further setup.
Which two are valid methods for configuring the management-ip address? (Choose two.)
Answer: A,D
Explanation:
A newly deployed BIG-IP Virtual Edition (VE) in VMware requires initial configuration of its management-ip address so it can be accessed over the network. F5 provides several valid mechanisms during initial console access:
A). Running the config utility
The config script is available on new BIG-IP installations and VE deployments.
It launches a guided text-based wizard allowing configuration of:
Management IP
Netmask
Default route
This is a standard and recommended method during first-time setup.
B). Using TMSH with create sys management-ip
Administrators can enter TMSH directly from the console and run:
create sys management-ip <ip>/<mask>
The management-ip object resides under sys, not under ltm or any other module.
This is the correct tmsh method for defining the management interface address.
NEW QUESTION # 41
The BIG-IP Administrator needs to update access to the Configuration Utility to include the
172.28.31.0/24 and 172.28.65.0/24 networks. From the TMOS Shell (tmsh), which command should the BIG-IP Administrator use to complete this task?
Answer: A
Explanation:
Access to the BIG-IP Configuration Utility (TMUI) is controlled through the /sys httpd allow list.
This list defines which IP addresses or subnets are allowed to connect to the management web interface.
To allow two new subnets--172.28.31.0/24 and 172.28.65.0/24--the administrator must add both subnets to the existing list without removing current entries.
In tmsh, subnet entries must be specified in network/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 }
NEW QUESTION # 42
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