VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

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Prepare for the VMware Certified Professional - Data Center Virtualization (VCP-DCV) exam with our comprehensive quiz. Use flashcards and multiple-choice questions with explanations and hints to ensure you're ready to ace your test.

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What port must be opened if an ESXi 6.x host appears as Not Responding due to a network firewall?

443 (TCP)
443 (UDP)
902 (TCP)
902 (UDP)

The correct answer is: 902 (UDP)

In an ESXi 6.x environment, if an ESXi host appears as "Not Responding," one of the common reasons for this status is network connectivity issues, which can often be attributed to firewall settings. The correct port that must be opened to allow communication between the vCenter Server and the ESXi host is port 902, specifically using the UDP protocol. Port 902 UDP is vital for multiple tasks within VMware environments, including the management and monitoring of ESXi hosts. This port facilitates the vSphere client connection for remote management features and allows for the sending of heartbeat packets from the ESXi host back to the management components, such as vCenter Server. If this port is blocked, vCenter Server may not be able to receive these heartbeats, leading it to assume that the ESXi host is unresponsive. By ensuring that UDP port 902 is opened in the firewall, you maintain crucial communication between the vCenter and the ESXi host, supporting functionality such as live migrations, the movement of virtual machines, and host monitoring, which ensures smooth operations within your virtualized data center.