2V0-41.24 Question 460
Select 3While troubleshooting a network virtualization environment, you observe that certain virtual machines are unable to communicate with external networks. Upon investigation, you identify that the physical uplink on the ESXi host is up, but the network connectivity issue persists. Which of the following could be potential causes?
- A
The VLAN configured on the physical switch port does not match the VLAN used by the virtual machines.
- B
The MTU size configured on the physical switch is smaller than the MTU size configured on the virtual network.
- C
The physical NIC on the ESXi host is configured in promiscuous mode.
- D
The physical switch port is configured as an access port instead of a trunk port.
- E
The physical NIC on the ESXi host is operating in a supported speed and duplex setting.
Show answer and explanation
Correct answers: A, B, D
Explanation
Troubleshooting physical infrastructure issues in network virtualization involves verifying configurations on both the physical and virtual layers. VLAN mismatches, MTU size discrepancies, and incorrect switch port configurations (e.g., access vs. trunk) are common misconfigurations that can cause connectivity issues. By identifying and resolving these specific issues, network connectivity can be restored effectively.
- A. Correct.
If the VLAN ID configured on the physical switch port does not match the VLAN ID used by the virtual machines' port groups, connectivity will fail as the traffic will not be tagged or routed correctly.
- B. Correct.
An MTU size mismatch between the physical switch and the virtual network can lead to packet fragmentation or drops, causing communication issues.
- C. Incorrect.
While promiscuous mode allows a NIC to capture all packets on the network, it does not directly cause connectivity issues. This is not a relevant cause in this scenario.
- D. Correct.
If the physical switch port is configured as an access port instead of a trunk port, it will not allow traffic for multiple VLANs, which may be required in a network virtualization environment.
- E. Incorrect.
A supported speed and duplex setting ensures proper communication between the ESXi host and the switch. However, this option indicates there is no issue with the physical NIC, so it is not a cause of the problem.