Exam 70-743 topic 1 question 16 discussion

Actual exam question from Microsoft's 70-743

Question #: 16
Topic #: 1

You have a Hyper-V host named Server1 that runs Windows Server 2016.
Server1 has a virtual machine named VM1. VM1 is configured to run the Docker daemon.
On VM1, you have a container network that uses transparent mode.
You need to ensure that containers that run on VM1 can obtain IP addresses from DHCP.
What should you do?

A. On VM1, run docker network connect.
B. On Server1, run docker network connect.
C. On VM1, run Get-VMNetworkAdapter –VMName VM1 | Set-VMNetworkAdapter –MacAddressSpoofing On.
D. On Server1, run Get-VMNetworkAdapter –VMName VM1 | Set-VMNetworkAdapter – MacAddressSpoofing On.

Show Suggested Answer

Suggested Answer: D 🗳️
If the container host is virtualized, and you wish to use DHCP for IP assignment, you must enable MACAddressSpoofing.
PS C:\> Get-VMNetworkAdapter -VMName ContainerHostVM | Set-VMNetworkAdapter -MacAddressSpoofing On
The command needs to be run on the Hyper-V host.
References: https://msdn.microsoft.com/en-us/virtualization/windowscontainers/management/container_networking

by RGB at June 19, 2019, 7:14 p.m.

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Guest

Highly Voted 5 years, 9 months ago

Answer C can't be correct because it runs the command to set the VM1 against VM1, and not against the VMHost for VM1

upvoted 9 times

supertech79

4 years, 9 months ago

If the container host is virtualized, and you need to use DHCP for the IP address assignment, then you must also use MAC address spoofing on the VM network adapter. Without MAC address spoofing, the Hyper-V host blocks the network traffic from the containers in the VM with identical MAC addresses. Get-VMNetworkAdapter -VMName ContainerHost | Set-VMNetworkAdapter -MacAddressSpoofing On That's from the MS Press book on 70-743. ContainerHost is VM1 and Server1 is hosting the ContainerHost VM.

upvoted 3 times

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smp

Most Recent 4 years, 5 months ago

Answer is correct, it needs to run on the host server (Server1) https://docs.microsoft.com/en-us/virtualization/windowscontainers/deploy-containers/deploy-containers-on-server - exact directions are towards bottom of page with explanation.

upvoted 1 times

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Chourak

4 years, 7 months ago

How you going to run "Set-VMNetworkAdapter" with the parameter -VMName on a VM? It doesn't make any sense, because you specify the -VMName on a host not on a guest. D is correct.

upvoted 1 times

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indylmc

6 years ago

PS C:\> Get-VMNetworkAdapter -VMName * Gets virtual network adapters from all virtual machines on the local Hyper-V host.

upvoted 2 times

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RGB

6 years ago

According to Microsoft, the answer should be C. https://docs.microsoft.com/en-us/virtualization/windowscontainers/container-networking/advanced To use DHCP for IP assignment on a virtual container host enable MACAddressSpoofing If the container host is virtualized, and you wish to use DHCP for IP assignment, you must enable MACAddressSpoofing on the virtual machine's network adapter. Otherwise, the Hyper-V host will block network traffic from the containers in the VM with multiple MAC addresses. You can enable MACAddressSpoofing with this PowerShell command: PS C:\> Get-VMNetworkAdapter -VMName ContainerHostVM | Set-VMNetworkAdapter -MacAddressSpoofing On

upvoted 1 times

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