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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Licensing | 20% | - License activation
|
| Topic 2: Management Connectivity and Configuration | 20% | - Initial system setup
|
| Topic 3: Software Image Management | 20% | - Installation and upgrade preparation
|
| Topic 4: System Upgrade and Maintenance | 20% | - Post-upgrade verification
|
| Topic 5: Securing BIG-IP | 20% | - Management security
|
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NEW QUESTION # 51
What will setting a Self IP to "Allow None" for Port Lockdown do?
Answer: B
Explanation:
The Port Lockdown feature controls which services a Self-IP will respond to.
Setting a Self-IP to Allow None means:
The Self-IP will not accept any traffic except the very limited, hard-coded HA ports such as TCP
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
Potential active-active condition, which is not intended and can cause traffic disruption Thus, Allow None can break HA functionality unless the Self-IP is not used for HA links.
NEW QUESTION # 52
How should the BIG-IP Administrator block connections to a Self IP on port 443 while allowing connections to other ports?
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 # 53
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: D,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.
Why the other options are not correct
A). F5 End User Diagnostics (EUD)
EUD is used exclusively for hardware diagnostics (ports, memory, fans). It does not provide software- related issue verification and is not used for upgrade planning.
C). F5 University
This is a training 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 is not 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 # 54
What happens after upgrading the BIG-IP system?
Answer: A
Explanation:
After a successful upgrade, the system automatically restarts and applies the newly uploaded software version.
NEW QUESTION # 55
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: D
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.
NEW QUESTION # 56
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