Exam F5CAB1 Topic 1 Question 51 Discussion

Actual exam question for F5's F5CAB1 exam
Question #: 51
Topic #: 1
What will setting a Self IP to "Allow None" for Port Lockdown do?

Suggested Answer: A Vote an answer

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.

by Cora at Jul 02, 2026, 03:23 AM

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