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Server-based application deployments might seem like a much simpler solution than client installations at first, but they too have both advantages and disadvantages. In a server-based deployment, you install the applications on a Windows Server 2008 R2 server with the Remote Desktop Services (RDS) role installed. Client workstations then access the application from the server, using the Remote Desktop client supplied with Windows 7. Because the application runs on the server, the workstation needs sufficient hardware only to run the client program, which is minimal. Because the server has only one copy of the application that services multiple clients, only one installation is required, and the administrators have to apply updates only once. The deployment process is therefore greatly simplified. Although convenient for the administrator, deploying applications using RDS increases the burden on the server substantially. A single server might have to maintain application sessions for dozens or hundreds of users at once, which means that the computer needs more and faster processor cores and a lot more memory. Administrators also have to consider the amount of network traffic generated by this application sharing process. The RDS client/server traffic generated by one session is not that much, but when you multiply that by hundreds of clients, the additional strain on the network can be significant. Running applications on servers also provides a single point of failure. If an RDS server goes down, all of its clients are cut off from their applications. The same is true if a network outage prevents the clients from accessing the servers. There is an economic factor to consider as well. RDS clients require an additional license, which adds to the cost of the operating system.

Every remote access policy specifies whether the connection matching the policy is allowed or denied. These permission settings correspond to the Grant Remote Access Permission option and the Deny Remote Access Permission option, respectively, which can be seen in Figure 10-15. Remember that this setting is normally overridden by the Allow Access option (outside of Windows 2000 mixed-mode domains) or the Deny Access option in the dial-in properties for an individual user account.

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Domain Name System (DNS) DNS is the standard name resolution service used on the Internet. It has also become the resolution service of choice on Windows 2000 and Windows Server 2003 networks and is tightly integrated with Active Directory Services. Windows Internet Naming Service (WINS) WINS is a database-driven service that tracks NetBIOS names and IP addresses. WINS was in prominent use in ver sions of Windows prior to Windows 2000, but its use has dropped sharply due to the adoption of DNS as the primary name resolution service in Windows.

A remote access policy profile consists of a set of dial-up constraints and properties that can be applied to a connection. You can configure a remote access policy profile by clicking the Edit Profile button in the policy properties dialog box, shown in Figure 10-15. Clicking this button opens the Edit Dial-In Profile dialog box, shown in Figure 10-18. By default, the policy profile is not configured; consequently, no additional restrictions or properties are applied to the connection.

Authorizing Remote Access Connections 10-31

Exam Tip Understand the evolution of name resolution services in Windows. HOSTS files were largely replaced by DNS for mapping host names. LMHOSTS files were largely replaced WINS for mapping NetBIOS names. DNS is now the system of choice (being tightly integrated with Windows Server 2003 and Active Directory) and is supplanting WINS.

Figure 10-18

This tab allows you to set the following dial-up constraints:

When the Internet was young so young, in fact, that it was known as ARPANET it consisted of only a few hundred computers. The task of tracking what host names went with what IP addresses was a relatively easy one. All of these mappings were located in a file named HOSTS, which was kept on a central computer on the network and perhaps mirrored on a few additional computers. Whenever a computer needed to resolve a host name, it consulted that file (occasionally copying it to the local com puter). As the network grew, however, it became impossible to use a single file to hold all the mappings. There were three problems with the existing setup:

Minutes Server Can Remain Idle Before It Is Disconnected Minutes Client Can Be Connected Allow Access Only On These Days And At These Times Allow Access Only To This Number Allow Access Only Through These Media

IP Tab You can set IP properties that specify IP address assignment behavior. You have the following options:

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