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2V0-622D · Question #125

A working virtual machine (VM) is migrated to a new Port Group from an existing Port Group on the same switch. The VM loses network connectivity when the migration is completed. Which could be a reaso

The correct answer is A. The new Port Group is not configured with the same VLAN ID as the existing Port Group.. A VLAN ID mismatch between the source and destination port groups is the most common reason a VM loses network connectivity immediately after a port group migration.

Section 2 – Configure and Administer vSphere 6.5 Networking

Question

A working virtual machine (VM) is migrated to a new Port Group from an existing Port Group on the same switch. The VM loses network connectivity when the migration is completed. Which could be a reason for the lack of connectivity for the VM?

Options

  • AThe new Port Group is not configured with the same VLAN ID as the existing Port Group.
  • BThe Virtual Machine must be rebooted before the settings take effect.
  • CThe new Port Group is not configured with the same name as the existing Port Group.
  • DThe ESXi host must be rebooted before the settings take effect.

How the community answered

(30 responses)
  • A
    80% (24)
  • B
    10% (3)
  • C
    3% (1)
  • D
    7% (2)

Why each option

A VLAN ID mismatch between the source and destination port groups is the most common reason a VM loses network connectivity immediately after a port group migration.

AThe new Port Group is not configured with the same VLAN ID as the existing Port Group.Correct

Virtual switches use VLAN IDs to segment and tag traffic; if the new port group carries a different VLAN ID than the original, the VM's frames are tagged for the wrong VLAN and the upstream physical switch will not forward them to the correct network segment. This causes an immediate loss of connectivity without any other configuration change required.

BThe Virtual Machine must be rebooted before the settings take effect.

Port group assignments on a vSwitch take effect immediately at the hypervisor layer without requiring a VM reboot; the guest OS network stack is unaffected.

CThe new Port Group is not configured with the same name as the existing Port Group.

Port group names are purely administrative labels and have no bearing on traffic forwarding or network connectivity.

DThe ESXi host must be rebooted before the settings take effect.

Reassigning a VM's port group is a live operation on the virtual switch and does not require an ESXi host reboot to take effect.

Concept tested: vSphere virtual switch VLAN ID and port group connectivity

Source: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-7225A28C-DAAB-4E90-AE8C-795A755FBE27.html

Topics

#port group#VLAN ID#network connectivity#vSwitch

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