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Setting Up the Virtual Directory To successfully test HTML pages that contain managed controls, you should create an ad hoc virtual directory and access the page through Internet Information Services (IIS). In other words, you can't simply prepare an HTML document and double-click it from Windows Explorer. In addition, the virtual directory must have the Execute Permissions setting configured to Scripts Only, as shown in Figure 14-2.

Neighbors By default, RIP either broadcasts (RIP version 1 or RIP version 2) or mul ticasts (RIP version 2 only) announcements. To prevent RIP traffic from being received by any node except neighboring RIP routers, the server running Routing And Remote Access can unicast RIP announcements. You configure RIP neighbors on the Neighbors tab of the RIP Properties dialog box, as shown in Figure 9-33.

Both C# and the CLR allow for covariance and contra-variance of reference types when binding a method to a delegate . Covariance means that a method can return a type that is derived from the delegate s return type . Contra-variance means that a method can take a parameter that is a base of the delegate s parameter type . For example, given a delegate defined like this:

Figure 9-33

delegate Object MyCallback(FileStream s);

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OSPF is designed for exchanging routing information within a large or very large internetwork. The biggest advantage of OSPF is that it is efficient; OSPF requires little network overhead even in very large internetworks. The biggest disadvantage of OSPF is its com plexity; it requires proper planning and is difficult to configure and administer. OSPF uses a Shortest Path First (SPF) algorithm to compute routes in the routing table. The SPF algorithm computes the shortest (least cost) path between the router and all the networks of the internetwork. SPF-calculated routes are always loopfree. Instead of exchanging routing table entries like RIP routers, OSPF routers maintain a map of the internetwork that is updated after any change to the network topology. This map, called the link state database, is synchronized between all the OSPF routers and is used to compute the routes in the routing table. Neighboring OSPF routers form an adjacency, which is a logical relationship between routers to synchronize the link state database.

9-62

it is possible to construct an instance of this delegate type bound to a method that is prototyped like this:

Figure 14-2: The virtual directory for the page that embeds a managed control must be configured to run only scripts. The reason for this is that if you configure Execute Permissions to Scripts And Executables, IIS will be fooled by the assembly's .dll or .exe extension and will treat the control's assembly as an ISAPI application. As a result, the control won't be hosted by the browser. A Data Display Custom Control The browser control class must be derived from Control or from another Control derived class. The control can't be a form or a Windows Forms-derived type. In addition, the control class must be publicly accessible and must contain a public default constructor 492

9

String SomeMethod(Stream s);

Changes to internetwork topology are efficiently flooded across the entire internetwork to ensure that the link state database on each router is synchronized and accurate at all times. Upon receiving changes to the link state database, the routing table is recalculated. As the size of the link state database increases, memory requirements and route com putation times increase. To address this scaling problem, OSPF divides the internetwork into areas (collections of contiguous networks) that are connected to each other through a backbone area. Each router keeps a link state database for only those areas that are connected to the router. Area border routers (ABRs) connect the backbone area to other areas. To further reduce the amount of routing information flooded into areas, OSPF allows the use of stub areas. A stub area can contain a single entry and exit point (a single ABR), or multiple ABRs when any of the ABRs can be used to reach external route destinations. Figure 9-34 shows a diagram of an OSPF internetwork.

Here, SomeMethod s return type (String) is a type that is derived from the delegate s return type (Object); this covariance is allowed . SomeMethod s parameter type (Stream) is a type that is a base class of the delegate s parameter type (FileStream); this contra-variance is allowed . Note that covariance and contra-variance are supported only for reference types, not for value types or for void . So, for example, I cannot bind the following method to the MyCallback delegate:

Figure 9-34

OSPF has the following advantages over RIP:

Int32 SomeOtherMethod(Stream s);

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