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Consider requiring domain controllers to be built at headquarters and then shipped to alternative locations. This means that the initial replication will already have occurred, and Kerberos can be used for authentication in the IPSec policy created for replication. Consider promoting domain controllers at remote locations by using the special dcpromo /adv switch. This technique will prompt you, and you can select restore from backup . In this case, you must supply a backup of Active Directory from headquarters to be used in the initial promotion. The Active Directory data in the backup will be used to update the Active Directory database. There is no need for the initial replication of domain data to occur over the WAN.

Our company has grown substantially in a short amount of time. We are no longer able to use a simple client/server model and are look ing to expand our options. Whatever we implement, I want a centralized appli cation server from which to run our applications. We will need at least three tiers: the client tier, the application logic tier, and the data tier. We need every lit tle piece of performance we can squeeze out.

To use certificates for authentication, each domain controller that will participate must obtain a certificate. You can build a Windows 2000 Certification Authority for this pur pose. Information on doing so is available in 2. Information on using the certificate for authentication in an IPSec policy is in Lesson 3.

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We are in a situation where changes have to be made to configurations frequently. If a database goes down, we need to be able to change the database. If an application server goes down, we need to be able to change the application server the clients are using. This change needs to happen fast, without our developers having to recompile the application and redistribute it. This might be one of the biggest problems I know of. Every minute of downtime costs us a fortune. And now, we have a ton of it. When we switch out an application server, our clients are down for 30 min utes. The support calls flood us. We have employees leaving for breaks who don t know when to come back because they don t know when things will be back up. When things go down in the middle of the night, it takes hours before we get them back up. This situation needs to be fixed as soon as possible.

There are three techniques for securing Active Directory traffic:

The itty bitty key HKCU\SessionInformation contains a single value. The REG_DWORD value ProgramCount indicates how many programs are running in the foreground. Each time you open a program on the desktop, Windows XP increments this value. Each time you close a foreground program, Windows XP decrements this value.

Answer the following questions for your manager: 1. How can the application logic be centralized 2. How can changes be made to instruct the client to use a different server with a minimum of effort 3. How can these procedures be implemented while maximizing performance so that total downtime is limited

A firewall s role traditionally is to present a barrier. Each port that must be opened for traffic reduces the firewall s effectiveness as a barrier. Full dynamic RPC requires random incoming high-port connections. This means there is no way to know which ports must be open on the firewall to enable the connection. Allowing dynamic RPC across a firewall means that all high ports must be opened. This approach is often referred to as making Swiss cheese out of the firewall because it provides an attacker with a large number of holes to use. To understand how it s possible to limit the use of RPC ports, consider how RPC works. The RPC service has a universally unique identifier (UUID) in the registry. The UUIDs are well-known that is, they are unique for each service and are the same across multiple platforms. For the services to be used, this UUID must be associated with a port. Port association is done when the RPC service starts. A free high port is obtained and registered with the UUID. The same port will be used for the service until it is stopped. However, the same port or a different port can be used the next time. This is why all ports must be open it is impossible to predict which port will be used.

To successfully master the objectives covered in this chapter, complete at least Prac tices 1 and 2.

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