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NEW QUESTION # 62
The Configuration Utility of a BIG-IP device is currently accessible via its management IP10.53.1.245from all VLANs.
The BIG-IP Administrator needs to restrict access so only hosts from the10.0.0.0/24subnet can access the Configuration Utility.
Which TMSH command accomplishes this?
Answer: A
Explanation:
BIG-IP controls access to the web-based Configuration Utility (TMUI) through the/sys httpd allowlist. This parameter specifies which client IPs or subnets may initiate HTTP/HTTPS connections to the management interface.
To restrict TMUI access toonlythe 10.0.0.0/24 subnet:
* The correct method is tomodify the HTTPD allow listso that it contains only this subnet.
* This requires replacing the entire current list with the new subnet using:
modify /sys httpd allow replace-all-with {10.0.0.0/24}
This ensures thatonlyclients within 10.0.0.0/24 can reach the Configuration Utility.
Why the other options are incorrect:
* Options A and Ccreate network ACL objects under /net acl, which apply to data-plane traffic, not management-plane TMUI access. TMUI access is not controlled by LTM ACLs but by the HTTPD allow directive.
* Option Bis incorrect syntax and references /ltm httpd, which is not the proper object; the correct hierarchy is /sys httpd.
Thus, only modifying the/sys httpd allowlist achieves the required restriction.
NEW QUESTION # 63
The device is currently on v15.1.2.1.
The BIG-IP Administrator needs to boot the device back to v13.1.0.6 to 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 version 13.1.0.6?
Answer: D
Explanation:
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 -b flag:
switchboot -b <volume>
This command marks the specified boot location as the one to be used on the next reboot.
Thus, to boot into HD1.2 which contains 13.1.0.6, 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.
NEW QUESTION # 64
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?
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 # 65
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 # 66
How should the BIG-IP Administrator block connections to a Self IP on port 443 while allowing connections to other ports?
Answer: D
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 # 67
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