F5CAB4 Control Plane Administration Practice Question
An administrator needs to restrict administrative access to the BIG-IP system so that only specific management workstations can reach the Configuration Utility. Which method is the most secure and appropriate control plane configuration?
⚠ Common exam trap
Candidates often confuse the 'Allow' list in the Management IP settings with packet filtering via AFM or self-IP packet filters, failing to realize the management interface has its own specific hardening settings.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define specific management IP addresses and masks in the Management IP Allow list.
Restricting access via the management IP and specific source subnets is critical for hardening the control plane. By utilizing the 'Allow' list under System > Configuration > Device > Management, administrators enforce a network-level security boundary that prevents unauthorized brute-force attempts from reaching the GUI or SSH services. This configuration effectively isolates management traffic from the data plane, ensuring that administrative tasks are performed only from trusted, hardened jump hosts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a SNAT pool on the management interface to mask source IP addresses.
Why it's wrong here
SNAT pools are designed for data plane traffic management and do not provide access control for management services. Using a SNAT pool would not prevent unauthorized workstations from initiating connections to the management interface, as it does not perform packet filtering or authentication for control plane access.
- ✗
Implement a self-IP address with a port lockdown setting of 'Allow None'.
Why it's wrong here
Self-IP addresses are intended for data plane traffic or VLAN-based communication, not dedicated management interface security. Setting port lockdown to 'Allow None' on a self-IP would block all traffic, potentially locking the administrator out of critical system services without providing management-specific host-based access control.
- ✓
Define specific management IP addresses and masks in the Management IP Allow list.
Why this is correct
The Management IP Allow list specifically restricts administrative access to the BIG-IP GUI and SSH services by source IP address. This provides a robust, built-in control plane firewall mechanism that ensures only authorized administrative subnets can communicate with the system's management services, effectively mitigating unauthorized connection attempts.
- ✗
Use an iRule on the external VLAN to redirect traffic away from the management interface.
Why it's wrong here
iRules process data plane traffic and cannot be applied to the BIG-IP management interface. Attempting to use an iRule for control plane security is technically impossible as the management plane operates independently of the TMM processes that execute iRules for traffic steering and load balancing policies.
Visual reference
About these practice questions
Courseiva writes every F5CAB4 question from scratch — 40 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official F5 exam blueprint
This F5CAB4 practice question is part of Courseiva's free F5 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the F5CAB4 exam.