BECKHOFF IPC-Security - Manual (Page 22)

4.2.2. Windows XP / Windows 7
4.2.2.1. Windows Updates
It is important to understand the different update scenarios from an IT infrastructure point-of-view. Depending
on the size of your IT infrastructure, one of the following scenarios could exist in your network environment.
Please note that there may be variations or even combinations of these scenarios.
Scenario 1: Industrial network separated from IT network with no access to the Internet
This scenario is probably one of the most commonly used setups in an industrial environment. Both, the
IT network and the industrial network, are separated by a firewall. The industrial network is not allowed to
access the IT network or the Internet and therefore cannot access any external Microsoft Update Servers.
However, there may be own Update Servers located in the IT network to distribute Windows Updates which
have been approved by the company’s IT department. For more information about these update servers,
please view the Microsoft documentation about WSUS.
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