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A Domain is a way to partition a network for security and administrative purposes. When you create an Active Directory site, the Active Directory automatically assigns the role of bridgehead server to one domain controller. The bridgehead server sends and receives replication data from remote sites. OUs can also serve as administrative and security boundaries. Different security standards can be placed on OUs, including different group policies. Administratively, an OU can be delegated so that a certain administrator or group controls it. With an OU, you can set security for a subset of an existing domain, have different administrators manage, and place different policies on the OU Sites are not a part of the DNS namespace, but they are maintained for traffic and replication flow purposes. When you define various sites within the Active Directory Sites and Services tool, you enable the Knowledge Consistency Checker (KCC) and other Active Directory services to know that your en...

 25 SMTP  53 DNS  80 HTTP  88 Kerberos  102 X.400  110 POP3  3389 RDP   119 NNTP  135 RPC  137 – NetBIOS Session Service  139 – NetBIOS Name Service  143 IMAP4  379 LDAP (SRS)  389 LDAP  21  ftp  443 HTTP (SSL)  445 – NetBIOS over TCP  465 SMTP (SSL)  563 NNTP (SSL)  636 LDAP (SSL)  691 LSA  993 IMAP4 (SSL)  994 IRC (SSL)  995 POP3 (SSL)  1503 T.120  1720 H.323  1731 Audio conferencing  1863 – MSN IM  3268 GC  3269 GC (SSL)  6001 Rpc/HTTP Exchange Store  6002 HTTP Exchange Directory Referral service  6004 Rpc/HTTP NSPI Exchange Directory Proxy service/Global Catalog  6667 IRC/IRCX  6891 – 6900 – MSN IM File transfer  6901 – MSN IM Voice  7801 – 7825 – MSN IM Voice

DFS (Distributed File System) was first introduced in Windows 2000 as a way of managing shared disk resources across a network and making it easier for users to find and access these resources. Unfortunately DFS in Windows 2000 was somewhat limited in its capabilities, especially in regard to providing high availability in distributed multi-site environments but also in efficiently replicating shared resources over slow WAN links. These limitations made DFS in Windows 2000 something of a pain to work with, and Windows Server 2003 offered little in terms of improvements. With the release of Windows Server 2003 R2 however, a fresh release based on Windows Server 2003 Service Pack 1, DFS has been significantly enhanced in several ways. In this article and several following on WindowsNetworking.com, I’ll describe these enhancements and show how to implement them in various enterprise scenarios. Installing DFS What used to be DFS in Windows 2000 and Windows Server 2003 is now two separate ...