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Transitive Trusts

Microsoft introduced the concept of transitive trusts in Windows 2000. This represented a considerable improvement over the previous Windows NT trusts that required explicitly defining each trust relationship, a requirement that could become unwieldy in a large enterprise network. To understand the principle of transitive trusts, look at Figure 5.16. In a nontransitive trust, as was the case in Windows NT 4.0, if you configured Domain A to trust Domain B and Domain B to trust Domain C, Domain A would not trust Domain C unless you configured a separate trust relationship. Furthermore, the trust relationship worked in one direction only (as shown by the arrows in Figure 5.16); for a two-way trust relationship, you had to create two separate trusts, one in each direction.

Figure 5.16. A transitive trust relationship enables trusts to “flow through” one domain to the next one, whereas in a nontransitive trust relationship, this does not occur.



  

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