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If a remote access connection is successfully authenticated, the connection must be authorized before remote access can occur. Remote access authorization occurs in two stages: first, the dial-in properties of the user account are verified, and then the first matching remote access policy is applied to the connection. The dial-in properties of the user account include a remote access permission set ting that consists of three options: Allow Access, Deny Access, and Control Access Through Remote Access Policy. A remote access policy consists of a policy condition that describes the type of connection to which the policy is applied. Remote access policies are ordered, and only the first matching remote access policy is applied to a remote access con nection. Remote access policies include a grant or deny access permission setting that can be overridden by user account settings. Remote access policies also include a policy profile that applies various attributes to the connection, such as authentication requirements, encryption requirements, or packet filters. To enable access for clients beyond the remote access server, the remote access server must be enabled as a router, and the IP routing option must be enabled in the Routing And Remote Access server properties. You can manage remote access client connections through the Remote Access Cli ents node in the Routing And Remote Access console.

Figure 1-3

The CLR allows a boxed value type T to be unboxed into a T or a Nullable<T> . If the reference to the boxed value type is null, and you are unboxing it to a Nullable<T>, the CLR sets Nullable<T> s value to null . Here is some code to demonstrate this behavior:

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Network Protocols Network protocols are network languages used for computer-tocomputer communication. For example, Windows networks, UNIX networks, and the Internet all rely on the TCP/IP network protocol for basic communication. In Windows, connections can communicate with foreign hosts only by using network protocols that are installed on the local computer and bound to that connection. TCP/IP (version 4) is installed and bound by default to every connection. However, the NWLink protocol must be manually installed, configured, and bound to connections requiring compatibility with Novell NetWare networks that do not use TCP/IP. (NWLink is the Microsoft implementation of the Internetwork Packet Exchange/Sequenced Packet Exchange [IPX/SPX] protocol, which is native to NetWare.) In addition, the AppleTalk protocol must be manually installed and bound to connections requiring compatibility with Apple networks that do not use TCP/IP.

Data can be saved to XML in a variety of formats, with or without schema information, as a full snapshot of the in-memory data including pending changes and errors, or with just the current instance of the data A dual-access model that lets you access and update the same piece of data either through a hierarchical programming interface or using the ADONET relational API Basically, you can transform a DataSet object into an XMLDOM object and view the XMLDOM's subtrees as tables merged with the DataSet object's tables The ADONET DataSet class represents the only NET Framework object that can be natively saved to XML The XML representation of a DataSet object can have two different layouts: the ADONET normal form and the DiffGram format In particular, the DiffGram format describes the history of the data and all recent changes.

// Create a boxed Int32 Object o = 5; // Unbox it into a Nullable<Int32> and into an Int32 Int32 a = (Int32 ) o; // a = 5 Int32 b = (Int32) o; // b = 5

TCP/IP is actually a group of protocols referred to as a stack or suite. This protocol stack includes Address Resolution Protocol (ARP), Internet Protocol (IP), Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Domain Name System (DNS), Hypertext Trans fer Protocol (HTTP), and many others.

// Create a reference initialized to null o = null; // "Unbox" it into a Nullable<Int32> and into an Int32 a = (Int32 ) o; // a = null b = (Int32) o; // NullReferenceException

Figure 1-4 shows the full list of protocols that can be readily installed and bound to particular connections. If your network relies on a protocol not listed, you must supply this protocol independently.

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When calling GetType on a Nullable<T> object, the CLR actually lies and returns the type T instead of the type Nullable<T> . Here is some code that demonstrates this behavior:

Network Services Network services are programs that provide features, such as quality of service, to hosts or protocols on a network. Figure 1-5 shows network services that can be readily installed and bound to network connections. Additional services can be installed from the Windows Server 2003 Setup disk or from a third-party source.

Each changed row in each table is represented by two nodes: the first node contains the 9.

Int32 x = 5; // The line below displays "System.Int32"; not "System.Nullable<Int32>" Console.WriteLine(x.GetType());

Network Clients In Windows, network clients are programs that allow a computer to connect to a network operating system. For example, by installing Client Service For NetWare and binding the service to a particular connection, you can connect to NetWare networks.

Addressing is the practice of maintaining a coherent system of addresses within your network so that all computers can communicate.

In the code below, I m casting n, a Nullable<Int32>, to IComparable<Int32>, an interface type . However, the Nullable<T> type does not implement the IComparable<Int32> interface as Int32 does . The C# compiler allows this code to compile anyway, and the CLR s verifier considers this code verifiable to allow you a more convenient syntax .

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