Your network contains two Hyper-V hosts named Host1 and Host2. Host1 contains a virtual machine
named VM1. Host2 contains a virtual machine named VM2. VM1 and VM2 run Windows Server 2012
R2.
You install the Network Load Balancing feature on VM1 and VM2.
You need to ensure that the virtual machines are configured to support Network Load Balancing
(NLB).
Which virtual machine settings should you configure on VM1 and VM2?
A.
DHCP guard
B.
MAC address
C.
Router guard
D.
Port mirroring
Explanation:
When MAC addresses are not assigned to virtual machines, it could cause network problems.
References:
Training Guide: Installing and Configuring Windows Server 2012 R2: Chapter 7: Hyper-V
virtualization, Lesson 1: Deploying and configuring Hyper-V hosts, p. 313-319
http://blogs.msdn.com/b/clustering/archive/2010/07/01/10033544.aspx
B. MAC Address
MAC Address spoofing must be enabled as explained in next paragraph:
In Hyper-V, the VM host prevents dynamic MAC address updates as an extra layer of security in the datacenter. This is because the VM may have full administrator rights, yet it may be untrusted in the datacenter, for example when the VM hosting is provided by an independent hosting company. In this scenario, we need to make sure that one VM cannot cause a DOS or information disclosure attack against another VM. If a VM is able to spoof its MAC address, then it can spoof the MAC addresses of other VMs and impact other VMs on that host. The physical switches have similar protections and it is up to the admin to enable that protection or not.
https://blogs.msdn.microsoft.com/clustering/2010/07/01/deploying-network-load-balancing-nlb-and-virtual-machines-on-windows-server-2008-r2/
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