2V0-21.23 Question 359
Single answerA VMware administrator is troubleshooting a vSphere cluster where virtual machines (VMs) on one ESXi host are experiencing intermittent network connectivity issues. Upon investigation, the administrator finds that the host's vmnic is flapping between 'up' and 'down' states. What is the best course of action to resolve the issue?
- A
Replace the physical network cable connected to the affected vmnic.
- B
Reboot the ESXi host to reset the network adapters.
- C
Disable the affected vmnic and rely on the remaining uplinks in the NIC team.
- D
Update the network driver and firmware for the physical NIC.
Show answer and explanation
Correct answer: D
Explanation
The vmnic flapping issue is often caused by outdated or incompatible network drivers or firmware. Updating the NIC driver and firmware ensures that the hardware is running the latest stable code, which can resolve such intermittent issues. While other options may provide temporary relief or address hardware problems, updating the driver and firmware is the best long-term solution to ensure network stability.
- A. Incorrect.
Replacing the physical network cable might resolve physical connectivity issues, but it does not address potential software or hardware driver issues, which are the likely cause in this scenario.
- B. Incorrect.
Rebooting the ESXi host may temporarily resolve the issue but does not address the root cause, which likely involves the NIC driver or firmware.
- C. Incorrect.
Disabling the affected vmnic could provide a temporary workaround if other uplinks are available, but it does not resolve the underlying issue and reduces redundancy.
- D. Correct.
Updating the network driver and firmware for the physical NIC is the most comprehensive solution because it addresses potential compatibility or stability issues that could be causing the vmnic to flap.