qr code generator in c#.net Part 7: Managing Active Directory and Security in C#.NET

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Part 7: Managing Active Directory and Security
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Hardware and Configuration Considerations for Domain Controllers
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Every domain controller is essentially a database server with a complex replication system, and as such, when you select hardware for and configure domain controllers, you should use all the care and attention that you d give to one of your mainstay database servers. The hardware you choose for the domain controllers should be as robust as the hardware for your database servers. The following guidelines should be taken into consideration:
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The CPU for a domain controller needs to be relatively fast. As soon as you install the second domain controller in a forest, a process called the knowledge consistency checker (KCC) begins running on every domain controller. The KCC is responsible for generating the replication topology and dynamically handling changes and failures within the replication topology. By default, the KCC on every domain controller recalculates the replication topology every 15 minutes. The more complex the replication topology, the more processing power it takes to perform, and, in many cases, even in small domain environments, the calculations performed by the KCC will cause the CPU to go to 100 percent utilization. This is acceptable for short durations. However, if the domain controller doesn t have a fast enough CPU, generating the replication topology in a complex environment could take several minutes rather than several seconds, which would severely affect the performance of all other processes running on the server. Some installations may benefit from having domain controllers with multiple CPUs. With multiple processors, you may see significant performance improvements. However, rather than having a single beefy domain controller, it is better to have multiple domain controllers placed appropriately. Domain controllers may use more memory than other servers. In addition to running standard processes, domain controllers must run special processes, such as storage engine processes, knowledge consistency checking, replication, and garbage collection. Therefore, most domain controllers should have at least 512 megabytes (MB) of RAM as a starting point. Be sure to monitor memory usage and upgrade as necessary. The data storage capacity you need depends entirely on the number of objects related to users, computers, groups, and resources that are stored in the Active Directory database. The initial installation of Active Directory requires only about 25 MB of available space. By default, the database is stored in the Ntdis.dit database file on the system volume, as are related log files. When the database and log files are stored together, the storage volume should have free disk space of at least 20 percent of the combined size of the database and log files. When the database and log files are stored separately, each storage volume should have free disk space of at least 20 percent of either the database or the log files, as appropriate.
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Part 7: Managing Active Directory and Security
Implementing Active Directory
Data protection
Domain controllers should use fault-tolerant drives to protect against hardware failure of the system volume and any other volumes used by Active Directory. I recommend using a redundant array of independent disks (RAID), either RAID 1 or RAID 5. Hardware RAID is preferable to software RAID.
As part of the hardware configuration, you should consider where you will install the files used by Active Directory. Active Directory database and log files are stored by default in the %SystemRoot%\NTDS folder, while the Active Directory system volume (Sysvol), which is created as a shared folder, and contains policy, scripts, and other related files, is stored by default in the %SystemRoot%\SYSVOL folder. These locations are completely configurable during installation; some consideration should be given to whether you want to accept the defaults or store the files elsewhere. You ll get much better scalability and performance if you put the database and log files on different volumes, each on a separate drive. The Active Directory Sysvol can remain in the default location in most cases. Note If you decide to move the Sysvol, it must be moved to an NTFS-5 volume. Because of this requirement, a volume formatted under Microsoft Windows NT is not acceptable. For security reasons, the database and log folders should be on NTFS-5 volumes as well, but this isn t a requirement. Active Directory is dependent on network connectivity and the Domain Name System (DNS). Domain controllers should be configured to use static Internet Protocol (IP) addresses and have the appropriate primary and secondary DNS servers set in their Transmission Control Protocol/Internet Protocol (TCP/IP) configuration, as discussed in 24, Managing TCP/IP Networking. If DNS isn t available on the network, you have the opportunity to make DNS available during the installation of Active Directory. Implement DNS as discussed in 26, Architecting DNS Infrastructure, and 27, Implementing and Managing DNS, and be sure to configure the DNS server to use itself for DNS resolution. If you previously deployed Microsoft DNS, as discussed in s 26 and 27, the DNS environment should already be set to work with Active Directory. If you are using a Domain Name System (DNS) server that does not use the Windows DNS, you can verify that the DNS server will work properly with Active Directory by using the Domain Controller Diagnostic Utility (Dcdiag.exe). This utility is included as part of the Windows Support Tools. Once you ve installed the Support Tools, you can run Dcdiag and test the DNS configuration by typing the following command at the command prompt:
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