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| Section | Objectives |
|---|---|
| Basic Traffic and Service Concepts | - Load balancing fundamentals
|
| BIG-IP Platform Fundamentals | - Basic networking concepts in BIG-IP
|
| Initial Installation and Setup | - Initial system configuration
|
| Software Upgrade and Maintenance | - Upgrade preparation
|
| System Configuration and Management | - System objects
|
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NEW QUESTION # 50
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
Answer: C
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 # 51
Which of the following areresource allocation (provisioning) settingsfor BIG-IP modules?
(Choose two.)
Answer: A,B
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 # 52
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 is172.28.32.22.
What command should the BIG-IP Administrator use to allow HTTPD access for this jump host?
Answer: C
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 asingle host IPto the existing list.
* The object/sys httpd allowsupports actions such asadd,delete, andreplace-all-with.
* Because the goal is toaddone 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.
Why the other options are incorrect:
* Option A (replace-all-with)wouldoverwritethe entire allow list, removing existing permitted subnets- unacceptable.
* Option B (delete)wouldremovethe existing networks and not add the required host.
Therefore, the correct administrative action is toaddthe jump host's IP.
NEW QUESTION # 53
How should the BIG-IP Administrator block connections to a Self IP on port 443 while allowing connections to other ports?
Answer: C
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 # 54
A BIG-IP Administrator needs to purchase new licenses for a BIG-IP appliance.
The administrator needs to know:
- Whether a module is licensed
- The memory requirement for that module
Where should the administrator view this information in the System menu?
Answer: C
Explanation:
To understand:
Which modules are licensed
Which modules are provisioned
The resource requirements (CPU / RAM) of each module
The administrator uses:
System ยป Resource Provisioning
This page displays:
All modules present in the license
Whether they are enabled or disabled
Required memory to activate each module
CPU and disk allocation information
Provisioning level options (None / Minimal / Nominal / Dedicated)
This is the exact location where BIG-IP administrators evaluate module capacity before enabling or purchasing licensing upgrades.
NEW QUESTION # 55
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