2V0-41.24 Question 459
Select 3A network administrator has deployed NSX-T in a data center. However, some VMs are unable to communicate with each other across different ESXi hosts. Upon investigation, the administrator finds that the physical switch port configuration might be causing issues. Which actions should the administrator take to troubleshoot and resolve the problem?
- A
Verify that the physical switch ports connected to the ESXi hosts are configured with the correct VLAN settings.
- B
Ensure that the MTU size on the physical switch matches or exceeds the MTU size configured in the NSX-T environment.
- C
Check if the physical switch ports are configured for port security to block unknown MAC addresses.
- D
Confirm that the physical switch supports and is configured for multicast traffic, if required by the NSX-T deployment.
- E
Disable spanning tree protocol (STP) on the physical switch ports connected to the ESXi hosts.
Show answer and explanation
Correct answers: A, B, D
Explanation
To troubleshoot communication issues across ESXi hosts in an NSX-T deployment, it's essential to verify VLAN settings, ensure the MTU size is consistent across the network, and confirm that the physical switch supports features like multicast if required. Misconfigurations in these areas can disrupt overlay traffic and lead to connectivity problems. Disabling STP or enabling unnecessary port security are not recommended actions in this scenario.
- A. Correct.
VLAN misconfiguration on the physical switch ports can prevent traffic from being tagged and routed correctly, leading to communication issues between VMs.
- B. Correct.
MTU (Maximum Transmission Unit) mismatches can cause packet fragmentation or packet loss, especially when NSX-T uses jumbo frames for overlay traffic.
- C. Incorrect.
Port security settings on the switch may block legitimate traffic, but this is not a common requirement for NSX-T environments and is unlikely to be the cause of the issue described.
- D. Correct.
NSX-T may use multicast for certain functions, such as BUM (Broadcast, Unknown unicast, and Multicast) traffic depending on the deployment. If multicast is required, the physical switch must support and be configured for it.
- E. Incorrect.
Disabling STP is not recommended as it is critical for preventing network loops. Instead, proper configuration of STP is necessary to avoid potential issues.