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Let's start with the basics:<br />
<br />
How is the user connecting:<br />
- &nbsp;wireless?<br />
- &nbsp;built-in wired ethernet?<br />
- &nbsp;external wired ethernet (USB, USB-C, Thunderbolt, ...)?<br />
<br />
What sort of error messages or conditions are you seeing?
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Let's start with the basics:

How is the user connecting:
-  wireless?
-  built-in wired ethernet?
-  external wired ethernet (USB, USB-C, Thunderbolt, ...)?

What sort of error messages or conditions are you seeing?

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Some research online shows that those pesky wireless issues have indeed returned with Sierra for some people. &nbsp;Certain pref files get corrupted when that happens. &nbsp;The solution is to clear them and start over.<br />
<br />
Doing so also clears up some wired connection issues as well, notably with external USB or Thunderbolt to ethernet adapters. &nbsp;I have used that method a few times. &nbsp;The full solution can be found at <b><a href="http://osxdaily.com/2016/09/22/fix-wi-fi-problems-macos-sierra/" rel="ugc">this link</a></b>.
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Some research online shows that those pesky wireless issues have indeed returned with Sierra for some people.  Certain pref files get corrupted when that happens.  The solution is to clear them and start over.

Doing so also clears up some wired connection issues as well, notably with external USB or Thunderbolt to ethernet adapters.  I have used that method a few times.  The full solution can be found at this link [http://osxdaily.com/2016/09/22/fix-wi-fi-problems-macos-sierra/].

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hi experts,<br />
<br />
&nbsp;i have a user using a MAC and she keeps loosing network connectivity. What can I check or test to see what is causing this.? Please walk me through it i'm not a mac user at all.
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hi experts,

 i have a user using a MAC and she keeps loosing network connectivity. What can I check or test to see what is causing this.? Please walk me through it i'm not a mac user at all.

macOS Sierra version 10.12.5 keeps loosing network connectivity

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.