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The F5 F5CAB1 certification exam is a crucial part of career development in the tech sector. Cracking the BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) exam strengthens your chances of landing high-paying jobs and promotions. Yet, preparing for the F5CAB1 Exam can be challenging, and many working applicants struggle to find F5CAB1 practice test questions they require to be successful in their pursuit.
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NEW QUESTION # 40
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
Answer: B
Explanation:
Self-IPs implement a security feature known as Port 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 port 4353 is used by Device 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 is exempt from Port Lockdown rules.
NEW QUESTION # 41
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?
Answer: C
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 # 42
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 the Automatic Activation Method ?
Answer: B
Explanation:
When you choose Automatic as the activation method in the License > Re-activate screen, the BIG-IP device itself contacts F5's license activation service over 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 the F5 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 of Automatic Activation .
NEW QUESTION # 43
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: A,E
Explanation:
Comprehensive and Detailed Explanation (Paraphrased from F5 BIG-IP Administration Install, Initial Configuration, and Upgrade concepts) 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 forknown bugs by TMOS version, module, severity, or defect ID.
* Review thestatus 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 forhardware diagnostics(ports, memory, fans). It does not provide software-related issue verification and is not used for upgrade planning.
C). F5 University
This is atraining 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 isnot 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 # 44
Which one of the following is a port and protocol combination allowed by the Allow Default setting for Port Lockdown?
Answer: A
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 # 45
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