qr code generator c# Lesson 2 in Visual C#.NET

Generation QR Code in Visual C#.NET Lesson 2

Lesson 2
Quick Response Code Creation In C#.NET
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QR-Code Recognizer In Visual C#.NET
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Planning Domain Controllers
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5-11
Encoding QR-Code In .NET
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Quick Response Code Creator In .NET
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You should use the following guidelines to help determine whether you should place a controller in a site:
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If the site contains a large number of users, placing a domain controller in the site ensures that the authentication of user logons does not generate network traffic that must cross a WAN link to get to a remote domain controller. If users must be able to log on to the domain even when a WAN link is down, you should place a domain controller in the local site. If the WAN link is unavailable and no local domain controllers are available to process logon requests, users log on by using cached credentials, and they cannot access resources on any comput ers other than the one to which they are logged on. If there are site-aware applications in the site that users from the domain need to access, you should place a domain controller in the site. The servers that host the site-aware applications can then authenticate users using the local domain control ler instead of generating authentication traffic that must cross a WAN link. If the site is a hub site (one that serves to connect other, smaller sites to one another), and the smaller sites do not have their own domain controllers, placing a domain controller in the hub site ensures better logon response.
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As you can see, most of the decisions to place domain controllers in sites require that you strike a balance between the additional overhead of having extra domain control lers and the savings in authentication traffic that must cross WAN links. When you place a domain controller for any of the previous reasons, you should be aware of the following concerns:
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Domain controllers must be maintained. You should place domain controllers only in locations that have administrators qualified to manage the domain controllers. If there is no local administrator, you must set up access so that the Information Technology (IT) staff can manage the domain controller remotely. Domain controllers must be secured. Place domain controllers only in sites where you can ensure the physical security of the domain controller.
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Determining the Number of Domain Controllers Required
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Once you determine where domain controllers should be placed, your next challenge is determining how many domain controllers a site needs to fulfill the needs for each domain in the site.
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UCC.EAN - 128 Generation In Java
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5-12
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Print Code 3/9 In Java
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5
Designing a Site Plan
The number of users from a domain that are located in a site is the primary factor in determining the number of domain controllers the site needs for that domain. To determine the basic number of domain controllers required for each domain in a site, consider the following:
If a site contains fewer than 1,000 users in a particular domain, only one domain controller for the domain is required in the site. If a site contains between 1,000 and 10,000 users in a particular domain, you should place at least two domain controllers for the domain in the site. For each 5,000 additional users a site contains for a domain, you should place an additional domain controller for the domain in the site. For example, if a site con tains 20,000 users from a domain, you should place four domain controllers for that domain in the site.
You also must consider the overhead that intersite replication causes when figuring out the number of domain controllers you need in a site. The basic rule of thumb is that for every 15 replication connections to a site, you should add an extra domain controller to handle the load.
Real World
Domain Controller Redundancy
Even if you can support the requirements of a site with only one domain control ler, you must place at least two domain controllers in a site to provide a level of fault tolerance if one domain controller fails. Also, a second domain controller can help balance the load even when it is not technically required. In general, you can provide a decent level of fault tolerance by placing one domain control ler more than the minimum number you determine will handle the load. Having an extra domain controller available prevents the remaining domain controllers from becoming overloaded if one fails.
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