Hotspot Question
Your network contains two Web servers named Server1 and Server2.
Both servers run Windows Server 2012 R2.
Server1 and 5erver2 are nodes in a Network Load Balancing (NLB) cluster.
The NLB cluster contains an application named App1 that is accessed by using the URL
http://app1.contoso.com.
You deploy a new server named Server3 that runs Windows Server 2012 R2.
The contoso.com DNS zone contains the records shown in the following table.
You need to add Server3 to the NLB cluster.
What command should you run? To answer, select the appropriate options in the answer area.
Answer: 
Get-nlbclusternode server1 will return the name of the cluster object and then you can pipe it into the add-nlbclusternode to say where you’re adding Server3 to.
https://technet.microsoft.com/en-us/library/ee817107.aspx
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Get-NlbClusterNode Server1 | Add-NlbClusterNode -NewNodeName Server3 -NewNodeInterface EtherNet
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Get-NLBClusterNode does not accept pipeline input.
The only option that works is Get-NLBCluster Server1 | Add-NLBClusterNode -NewNodeName Server3 -NewNodeInterface Ethernet
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Get-NLBClusterNode accept pipeline input
See “Example 2” from below website
https://docs.microsoft.com/en-us/powershell/module/networkloadbalancingclusters/get-nlbclusternode?view=win10-ps
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