2V0-21.23 Question 175
Single answerYou have been tasked with troubleshooting a networking issue in a VMware vSphere environment. During your investigation, you discover that virtual machines on one ESXi host are unable to communicate with virtual machines on another ESXi host. Upon examining the distributed switch configuration in vCenter Server, which setting should you verify to ensure proper inter-host communication?
- A
The MTU size configured on the distributed switch and physical network devices
- B
The VLAN ID assigned to the distributed port group
- C
The IP addresses assigned to the ESXi hosts' management network
- D
The number of uplink ports available on the distributed switch
Show answer and explanation
Correct answer: B
Explanation
When troubleshooting inter-host communication issues in a VMware vSphere environment, it is essential to verify that the VLAN ID configuration on the distributed port group is correct. VLAN IDs ensure that traffic is appropriately tagged and routed between hosts. A misconfigured VLAN ID on the distributed switch can prevent virtual machines on different hosts from communicating properly, even if other network settings like uplinks and MTU size are correctly configured.
- A. Incorrect.
The MTU size mismatch could cause packet fragmentation issues, but it is not the primary setting to verify for inter-host communication in this scenario.
- B. Correct.
The VLAN ID is critical for ensuring proper communication between virtual machines across hosts. If the VLAN ID is misconfigured, inter-host communication will fail.
- C. Incorrect.
The management network IP addresses are unrelated to the virtual machine communication issue in this context. This setting is important for managing the ESXi hosts but not relevant to VM-to-VM communication.
- D. Incorrect.
The number of uplink ports is important for network capacity and redundancy, but it is unrelated to the failure of communication between virtual machines in this scenario.