PowerShell Proxies
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For this example we will configure two PowerShell proxies. One of these
will be used to for the connections on the on-premises components - Active
Directory, Skype for Business Server, and Exchange Server. We will use the
other proxy to connect with the applications hosted in Office 365: Skype
for Business Online and Exchange Online.

The decision to use two proxies rather than one - or five, or some other
number in between - was somewhat arbitrary in this case; we chose two
proxies mainly to demonstrate both how to divide the proxy duties between
hosts, and how to combine multiple applications into a single proxy. We
will install two new servers for this purpose, and we'll call them
``psproxy01`` and ``psproxy02``, with the respective IP addresses of
``10.5.25.240`` and ``10.5.25.241``. After installing Windows Server 2012 R2 on
both machines, we join them to the ``flexcorp.com`` domain. We can now start
configuring them.