Target Skills:
Describe the messaging roles of Internet Relays and Firewalls.
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Internet Connectivity
If you are sending messages to and from the internet, you need to protect
your messaging and directory information from unauthorized access from
the outside world. You can do this through the use of an Internet Relay
and a Firewall.
Internet Relay
One way to protect your messaging system is by setting up an Internet Relay,
a single point of contact for the outside world that simply sends all your
incoming messages across your Firewall to a specific messaging server,
called the Inbound Messaging Hub. The Inbound Messaging Hub then
does the Directory queries to find out where to send the message. The Internet
Relay sits in the "De-Militarized Zone" (DMZ) of the firewall (between
the external and internal walls of the firewall), and has no access to
or information about any other servers other than the Inbound Messaging
Hub.

Firewall
A security system that protects the messaging network and network in general
from unauthorized access. All internet traffic (to and from) has
to passes through the firewall and its controls, allowing greater network
security. The Firewall is set up to only allow incoming messages
from the Internet Relay to the Inbound Messaging Hub.
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