What Is an ERP Server? Domain controller. History[edit] Windows NT[edit] With Windows NT server, one domain controller per domain was configured as the Primary Domain Controller (PDC); all other domain controllers were Backup Domain Controllers (BDC). A BDC could authenticate the users in a domain, but all updates to the domain (new users, changed passwords, group membership, etc.) could only be made via the PDC, which would then propagate these changes to all BDCs in the domain.
If the PDC was unavailable (or unable to communicate with the user requesting the change), the update would fail. Windows 2000[edit] Windows 2000 and later versions introduced Active Directory ("AD"), which largely eliminated the concept of primary and backup domain controllers in favor of multi-master replication. However, there are still several roles that only one domain controller can perform, called the Flexible single master operation roles (some of these roles must be filled by one DC per domain, while others only require one DC per AD Forest).
Maintaining Physical Security. All of the previous domain controller security measures assume that your domain controllers are physically secure. Physical security ensures that unauthorized users cannot turn domain controllers on or off, add or remove hardware, insert or remove removable media, log on by using the domain controllers’ keyboards and displays, or remove backup media. To maintain physical security for your domain controllers: Secure domain controllers against physical access. Prevent domain controllers from booting into alternate operating systems. Protect domain controllers on restart by using SYSKEY. Securing Domain Controllers Against Physical Access The first line of defense in maintaining physical security is to secure domain controllers against any attacks that can be accomplished with physical access to a domain controller. Take the following common security precautions for restricting physical access to your domain controllers: Use UPSs to prevent loss of power.
Evaluating the Need for SYSKEY. 10 physical security measures every organization should take. This information is also available as a PDF download. Every general computer networking class teaches the OSI and/or DoD networking models, and we all learn that everything begins at the bottom, with the physical level.
Likewise, when it comes to IT security, physical security is the foundation for our overall strategy. But some organizations, distracted by the more sophisticated features of software-based security products, may overlook the importance of ensuring that the network and its components have been protected at the physical level. In this article, we'll take a look at 10 of the most essential security measures you should implement now, if you haven't already done so. #1: Lock up the server room Even before you lock down the servers, in fact, before you even turn them on for the first time, you should ensure that there are good locks on the server room door.
. #2: Set up surveillance #3: Make sure the most vulnerable devices are in that locked room #4: Use rack mount servers Summary.