The BIG-IP Administrator wants to manage the newly built F5 system through anin-band Self-IP.

Self-IPs include a security feature calledPort Lockdown, which restricts which services respond on that Self-IP.

By default, Self-IPs block management access (SSH and HTTPS/TMUI), meaning an administrator cannot manage the device through in-band Self-IPs unless explicitly allowed.

Allow Mgmt / Allow Management

These settings enable only the management services required for administrative access, specifically:

SSH (22)

HTTPS/TMUI (443)

These options allow secure administration without opening unnecessary ports.

Why these are correct:

They provide only the essential access for management.

They follow F5 security best practices when using in-band admin access.

They donotexpose all services, reducing the attack surface.

Why the other options are incorrect:

A. Allow Default

This allows only a minimal set of system-required ports (e.g., failover, config sync), not SSH or HTTPS.

Administrator access would still fail.

B. Allow All

Opens all ports on the Self-IP, which isnot secure.

Exposes services that should remain restricted.

Therefore,Allow Mgmt / Allow Managementare the correct choices.