. What is trust relationship and how many types of trust relationship is there in exchange 2003?

Hello Friends,

What is trust relationship and how many types of trust relationship is there in exchange 2003?

Since domains represent security boundaries, special mechanisms called trust relationships allow objects in one domain (called the trusted domain) to access resources in another domain (called the trusting domain). 

Windows Server 2003 supports six types of trust relationships: 

■ Parent and child trusts

■ Tree-root trusts

■ External trusts

■ Shortcut trusts

■ Realm trusts

■ Forest trusts