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Dynamic routing uses specialized protocols that enable routers to communicate with each other and share their routing table information. Routers have direct knowledge of only the networks to which they are connected. For a router to efficiently forward traf fic to a distant network, it must have information in the form of routing table entries it has obtained from a router connected to that network. When you configure a router to use dynamic routing, it transmits the contents of its routing table to other routers at var ious intervals. Dynamic routing eliminates the need for network administrators to manually create static routes on each router. More importantly, dynamic routing enables routers to compensate for changes in the network. For example, network designers often create redundant routes between networks, so that if a router or a connection fails, traffic can still reach any destination. For this type of failover system to work, routing table entries must be changed when a failure occurs. It is possible for administrators to make the changes, if they are on duty when the failure occurs, and if they are aware of the failure. However, dynamic routing enables the routers to make these changes automatically. When a router fails to transmit its routing table entries on schedule, the other routers detect the absence of incoming messages and remove the failed router from their rout ing tables. This prevents the routers from forwarding traffic to the failed router; instead, they use other paths through the network. When the failed router is back in operation, it resumes transmitting its dynamic routing messages and the other routers on the network begin to use it again by modifying their routing tables accordingly.

The base class for action name selectors is ActionNameSelectorAttribute. The class has a simple structure, as the code here demonstrates:

Sub Test() Dim MyPlants As Plants Dim p As Plant Dim i As Long Set MyPlants = New Plants MyPlants.SampleData For i = 1 To MyPlants.Count Set p = MyPlants.Item(i) MsgBox p.Name Next i

Off the Record On a complex enterprise network, it would be extremely difficult for administra tors to monitor all the routers on the network and keep their routing tables updated using manual programs such as Route.exe. Dynamic routing provides a more efficient, automatic solution.

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Once you decide to use dynamic routing on your network, the next step is to select the routing protocol. The IP routing that occurs on even the largest private network is relatively simple when compared with the massive routing problems found on the Internet. The TCP/IP standards define many routing protocols, of which private networks only use a few.

Planning The routing protocols most commonly used on private networks are the two supported by the Routing and Remote Access service in Windows Server 2003: Routing Informa tion Protocol (RIP) and Open Shortest Path First (OSPF). In most cases, the designer of a routing strategy selects one of these two protocols.

Next it uses a For Next loop to iterate through each item in the collection. The object variable p is set to the current item from the collection, and the Name property is displayed in a mes sage box. Notice that the first item in the collection begins with 1, and the number of items in the col lection is retrieved from the collection s Count property.

public abstract class ActionNameSelectorAttribute : Attribute { public abstract bool IsValidName( ControllerContext controllerContext, string actionName, MethodInfo methodInfo); }

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Classes are an ideal way to hold data from an external source. By holding the data in a col lection class, you can allow your program to access the data independently of how the data is physically stored. This way if you change the way the data is stored, you don t have to change the way that the data is accessed. By providing a method named LoadData, anyone using the class can load the data from the data source. Then if you migrate the data from a worksheet to an Access database, only the load method will change. The code accessing the collection class won t change, unless you change the parameters to the LoadData method. Likewise, you could provide a standard method called SaveData, which would update the data wherever it s stored. With a little work, you could even make the method intelligent enough so that it updates only the objects that were updated, instead of having to update all the data whether it was updated by the user or not.

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You can also extend a class by adding basic business rules. For example, the following method validates the information in a Plant object. This code merely checks each property in the class with potential error conditions and returns True if no errors are found and False if they are.

The following sections compare the characteristics and capabilities of RIP and OSPF, providing the information you need to select the appropriate one for your network.

The purpose of the selector is simple: checking whether the action name is valid or not. In ASP.NET MVC, there s just one action name selector: the ActionName attribute that you can use to alias a controller method. You encountered the ActionName attribute in 7, Data Entry in ASP.NET MVC, in the discussion about the Post-Redirect-Get pattern for input forms.

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