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・ Primary cutaneous adenoid cystic carcinoma
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Primary Domain Controller
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Primary Domain Controller : ウィキペディア英語版
Primary Domain Controller
A Primary Domain Controller (PDC) is a server computer in a Windows domain. A domain is a network of logically grouped computers to which access is controlled by the PDC. Various account types exist in the domain, the most basic is the "guest" or "anonymous login" account. The PDC has an administration account which has overall total control of the domain resources.
==PDCs==
In Window NT, one DCO serves as the Primary Domain Controller. Others, if they exist, are usually a Backup Domain Controller (BDC). The primary domain controller (PDC) PDC is typically designated as the "first". The "User Manager for Domains" is a utility for maintaining user/group information. It uses the domain security database on the primary controller. The PDC has the master copy of the user accounts database which it can access and modify. The BDC computers have a copy of this database, but these copies are read-only. The PDC will replicate its account database to the BDCs on a regular basis. The BDCs exist in order to provide a backup to the PDC, and can also be used to authenticate users logging on to the network. If a PDC should fail, one of the BDCs can then be promoted to take its place. The PDC will usually be the first domain controller that was created unless it was replaced by a promoted BDC.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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