2V0-41.24 Question 37
Single answerAn organization is using VMware NSX-T Data Center to implement network virtualization. The administrator notices that certain workloads on a specific ESXi host are unable to communicate. Upon investigation, it is found that the TEP (Tunnel Endpoint) on that host is not functioning correctly. Which component or configuration should the administrator check to resolve the issue?
- A
The configuration of the VDS (vSphere Distributed Switch) uplinks on the ESXi host.
- B
The MTU (Maximum Transmission Unit) size configured on the physical network for the overlay network.
- C
The firewall rules configured on the NSX-T Gateway for north-south traffic.
- D
The IP address pool assigned to TEPs during NSX-T host transport node configuration.
Show answer and explanation
Correct answer: B
Explanation
The NSX-T Data Plane relies on Tunnel Endpoints (TEPs) for encapsulating and transporting overlay traffic between transport nodes. If the MTU size on the physical network is not configured to handle the additional overhead of overlay traffic, TEP communication can fail. This makes verifying the MTU size a key troubleshooting step in such scenarios.
- A. Incorrect.
Incorrect. While uplink configuration is important for network connectivity, this issue is specifically related to the TEP, which relies on overlay network settings, not VDS uplinks.
- B. Correct.
Correct. A misconfigured MTU size can cause TEP communication failures because overlay networks in NSX-T require a specific MTU (e.g., 1600 or higher) to encapsulate traffic properly.
- C. Incorrect.
Incorrect. Firewall rules on the NSX-T Gateway are related to traffic entering or leaving the NSX environment (north-south traffic) and do not affect TEP functionality.
- D. Incorrect.
Incorrect. While TEP IP address pools are critical for assigning IPs to TEPs, a problem with the pool would typically result in no IP assignment rather than TEP communication issues caused by MTU settings.