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What will setting a Self IP to "Allow None" for Port Lockdown do?
Correct Answer: A
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.
