2V0-41.24 Question 76
Single answerA network administrator has deployed a logical switch in an NSX-T environment to segment traffic for a specific application. Virtual machines attached to the logical switch are not able to communicate with each other. Upon inspection, the administrator notices that the virtual machines are configured with IP addresses in the same subnet and the logical switch is correctly configured. What could be the possible cause of the issue?
- A
The logical switch's overlay transport zone is not configured.
- B
The virtual machines' vNICs are not connected to the logical switch.
- C
The TEP (Tunnel Endpoint) IP addresses of the ESXi hosts are incorrectly configured.
- D
The logical switch's MAC forwarding table is full.
Show answer and explanation
Correct answer: B
Explanation
In logical switching within NSX-T, virtual machines must have their vNICs appropriately connected to the logical switch to communicate. If the vNICs are disconnected, no traffic can traverse the logical switch, even if other configurations are correct. This issue is specific to the logical switch's local forwarding capabilities and does not involve transport zones or TEPs unless cross-host communication is required.
- A. Incorrect.
An overlay transport zone not being configured would result in a failure to establish connectivity between ESXi hosts, but it would not cause communication issues for VMs attached to the same logical switch within the same host.
- B. Correct.
If the virtual machines' vNICs are not connected to the logical switch, they will not be able to communicate with each other, even if the logical switch is correctly configured.
- C. Incorrect.
Incorrect TEP IP addresses would cause issues with communication across hosts, but it would not impact communication between VMs on the same host and logical switch.
- D. Incorrect.
A full MAC forwarding table could cause packet drops, but it is highly unlikely in a typical NSX-T environment with a logical switch, as NSX uses distributed switching and scales MAC table management efficiently.