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policies in different environments in this model. If you use this model, take both the root and intermediate CAs offline to protect them, as shown in Figure 15-5.
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Figure 15-5 A three-tiered hierarchy in a geographic deployment
Creating more than three tiers only in highly complex environments that require the utmost security where the CA infrastructure must be protected at all times.
As you can see, the more tiers you create in a hierarchy, the higher the level of complexity in terms of management and administration. However, the more complex your hierarchy, the more secure it can be. In addition, consider which type of CA you need to deploy in each tier. Table 15-2 outlines the CA type based on the tier model.
Lesson 1: Understanding and Installing Active Directory Certificate Services
Table 15-2 Assigning CA Type Based on Tier Model
CA Type Root CA Intermediate CA Issuing CA
One Tier Enterprise CA (online)
Two Tiers Standalone CA (offline) Enterprise CA (online)
Three Tiers Standalone CA (offline) Standalone CA (offline) Enterprise CA (online)
Exam Tip
Keep these different hierarchies in mind when you take the exam. CA hierarchies are an important aspect of any AD CS deployment.
Best Practices for AD CS Deployments
Architectures using two or more tiers represent the most common deployments of AD CS. When you plan for your AD CS infrastructure, keep the following in mind:
Avoid single-tiered hierarchies as much as possible because they are very difficult to protect. Root and intermediate CAs (if implemented) should be taken offline as soon as possible after the infrastructure is in place. For this reason, these CAs are excellent candidates for virtualization through Windows Server 2008 Hyper-V. Create a virtual machine (VM), install the AD CS Standalone CA role, and then save the machine state as soon as you can. Consider removing the VM files for the root CA from the host server as soon as it is taken offline. Store the secured VM in a vault of some type. If you use virtualization in support of your AD CS deployment, secure the VMs as much as possible. It is a lot easier to walk away with a VM than it is with a physical server. Consider creating VMs that do not have or that have disabled network connections for the root and intermediate CAs. This ensures an even higher level of protection. Certificates are transferred from these servers through either USB devices or floppy disks. Control the removable devices on root and intermediate CAs through device protection settings in the Local Security Policy console. This adds a further layer of protection. Make sure your CA administrators are highly trustworthy individuals. They control the entire CA hierarchy and, because of this, they are in a very high position of trust. Secure thoroughly the data center that hosts the CAs. Control access to the data center and use smart card administrative logons as much as possible. Consider using a single root CA but adding availability through multiple CA installations as soon as you reach the intermediate and issuing tiers of the hierarchy. You cannot change the name of a server after the AD CS service is installed, so plan your server names carefully and make sure you can keep them for a very long time. You cannot change a CA from standalone to enterprise or vice versa after AD CS is installed. Once again, plan accordingly.
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Active Directory Certificate Services and Public Key Infrastructures
As a general practice, do not install AD CS on a DC. Although it can be done, endeavor to keep the AD DS server role independent of all other roles except the Domain Name System (DNS) role.
These guidelines will assist you in your AD CS deployment planning phase.
MORE INFO
Best practices for PKI deployments
For additional information on PKI deployments with Windows infrastructures, look up Best Practices for Implementing a Microsoft Windows Server 2003 Public Key Infrastructure at http://technet2.microsoft.com/windowsserver/en/library/091cda67-79ec-481d-8a9603e0be7374ed1033.mspx mfr=true. It refers to Windows Server 2003 rather than to Windows Server 2008, but its practices are still valid for any version of Windows.
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