Click to download Ethernet Basics manual - Grant Industrial Controls
Click to download Ethernet Basics manual - Grant Industrial Controls
Click to download Ethernet Basics manual - Grant Industrial Controls
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Chapter 9<br />
Au<strong>to</strong>mation networks & Security<br />
9.1 Corporate network<br />
A corporate network is the set of servers, computers and systems that enable the general<br />
functioning of the company on IT-level. <strong>Ethernet</strong> TCP/IP is already for years the standard<br />
when it comes <strong>to</strong> setting up IT networks in office and companies. A corporate network is, in<br />
its simplest form, linked <strong>to</strong> the Internet via a router and a firewall. Larger corporate networks<br />
also provide a DMZ - this is a part of the network containing public servers (mail server, web<br />
server, DNS server,...).<br />
Figure 9.1: A corporate network<br />
A router, in its simplest form, is a device that enables communication between two networks.<br />
Specifically, this is the corporate network (LAN) on one side and the Internet (WAN) on the<br />
other side. Firewalls are used <strong>to</strong> block unwanted communication whereby IP packets are<br />
filtered in accordance with rules that the user has established. Incoming as well as outgoing<br />
communication can be blocked. The filter criteria can be IP addresses, port numbers or<br />
certain pro<strong>to</strong>cols that can be blocked or released by choice.
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