2V0-21.23 Question 174
Single answerYou are tasked with examining the configuration of a vSphere Distributed Switch (vDS) in a vCenter environment to troubleshoot a network connectivity issue. Upon inspection, you notice that virtual machines attached to one of the port groups on the vDS cannot communicate outside their subnet. Which configuration setting should you check first on the distributed switch?
- A
The VLAN ID configured on the port group
- B
The MTU size on the distributed switch
- C
The number of uplink ports assigned to the distributed switch
- D
The Teaming and Failover policy on the port group
Show answer and explanation
Correct answer: A
Explanation
In this scenario, the primary issue is related to communication being restricted to a specific subnet, which often points to VLAN misconfiguration. VLAN IDs are used to tag network traffic and ensure proper routing. If the VLAN ID on the port group is incorrect or mismatched with the physical network configuration, it can block communication outside the subnet. Checking the VLAN configuration is the most logical first step in troubleshooting this issue.
- A. Correct.
The VLAN ID is critical for ensuring proper communication between VMs and the external network. A misconfigured VLAN ID can prevent traffic from being routed correctly.
- B. Incorrect.
While the MTU size can impact network performance, it is less likely to cause communication issues specific to a single subnet. This would typically manifest as packet fragmentation.
- C. Incorrect.
The number of uplink ports may affect overall redundancy and throughput, but it is not the primary setting to check when troubleshooting subnet-specific communication issues.
- D. Incorrect.
The Teaming and Failover policy governs how traffic is distributed across uplinks and how failover is handled. While important, it is less likely to be the root cause of a subnet-specific issue like this.