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Virtual machine VM1 is unable to communicate with virtual machine VM2. Both virtual machines are connected to a portgroup named Production on vSwitch1 on host ESXi01. Which statement could explain why?
A. The only vmnic connected to vSwitch1 on ESXi01 is set to unused
B. The only vmnic connected to vSwitch1 on ESXi01 is set to standby
C. Load balancing settings on Production do not match vSwitch1
D. VM1 is configured for VGT, VM2 is configured for VST
Correct Answer: D
Explanation/Reference:
http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.networking.doc%2FGUID-7225A28C-DAAB-4E90-AE8C-795A755FBE27.html
VLAN Configuration
Virtual LANs (VLANs) enable a single physical LAN segment to be further segmented so that groups of ports are isolated from one another as if they were on physically different segments.
Configuring ESXi with VLANs is recommended for the following reasons.
It integrates the host into a pre-existing environment
It secures network traffic.
It reduces network traffic congestion. iSCSI traffic requires an isolated network.
You can configure VLANs in ESXi using three methods: External Switch Tagging (EST), Virtual Switch Tagging (VST), and Virtual Guest Tagging (VGT).
With VST, all VLAN tagging of packets is performed by the virtual switch before leaving the host. Host network adapters must be connected to trunk ports on the physical switch. Port groups that are connected to the virtual switch must have an appropriate VLAN ID specified.
With VGT, all VLAN tagging is performed by the virtual machine. VLAN tags are preserved between the virtual machine networking stack and external switch when frames are passed to and from virtual switches. Physical switch ports are set to trunk port.
With EST, all VLAN tagging of packets is performed on the physical switch. Host network adapters are connected to access ports on the physical switch. Port groups that are connected to the virtual switch must have their VLAN ID set to 0.
