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Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
Correct Answer: B
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.
