| Your understanding is correct.
You may still want to consider NT trust relationships to support
roaming users that travel from one Exchange site to another
(one NT domain to another), and need access to their home mailbox.
See also the Exchange implementation inside Digital (multiple sites
spread across 3 NT domains: digital1, digital2, digital3).
For answering these kind of questions, and learning about MS Exchange
in general, I found the following online book on the Internet very useful:
http://www.mcp.com/que/developer_expert/seexch/
Below an extract from chapter 2
"Understanding Exchange's Organization and Sites":
"...There are some general requirements that must be met
by all servers within a site:
o All servers in a site must me able to communicate via
Remote Procedure Calls (RPCs). RPCs can communicate over the
network by using the various Microsoft Windows NT--supported protocols,
inlcuding TCPIP, IPX, NetBeui, and DLC. Generally, this means that
all the servers must be on the same LAN or WAN. But if you do have a
large network spanning geographical boundaries and that network connection
supports communication via RPCs, then you could define those servers to all
be within the same site (provided the other following requirements are
met).
o High bandwidth connections are required for server communication within a
site. The definition of high bandwidth is somewhat arbitrary, but for our
purposes we consider 128 Kb/s to be the absolute minimum bandwidth for
reasonable intra-site communication. Basically, the connection must be
fast enough to allow efficient RPC connections between servers.
Of course, the bigger the pipe, the better the performance.
o The network connection must be permanent. The links between all servers
in a site must be up at all times.
o All servers must exist in the same Windows NT security context.
This means all servers must be in the same Windows NT domain or
within a trusted domain. Exchange servers in a site must be able
to authenticate each other in order to share information."
/Harald
[Posted by WWW Notes gateway]
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