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In the Microsoft implementation of L2TP, IPSec Encapsulating Security Payload (ESP) is used to encrypt L2TP traffic. The combination of L2TP (the tunneling proto col) and IPSec (the method of encryption) is known as L2TP/IPSec. L2TP/IPSec is described in RFC 3193. The result after applying ESP to an IP packet containing an L2TP message is shown in Figure 2-8. By combining the properties of L2TP and IPSec, L2TP/IPSec has all the functionality of PPTP while providing all the added security and control of IPSec.

dtPart=tstr.Substring(4,tstr.Length-4); yr=System.Int32.Parse(dtPart); if ( yr<30 ) { yr+=2000; } else { if ( yr<100 ) { yr+=1900; } } Text=mo.ToString() + "/" + da.ToString() + "/" + yr.ToString();

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These route placeholders are also referred to as route parameters. They are used to pass named parameters (named with the key) to the routing engine. You can also set default values for your route parameters. These defaults are used if a parameter is omitted from the URL. You define a default route parameter by using a RouteValueDictionary object. By using this object, you can pass route parameter names and default values. In fact, the default routing setup uses default parameter values. The following code shows an example. Notice that the {controller}, {action}, and {id} are all mapped to default values. In this case, if you omit all segments of the URL, users will be routed to Home/Index by default. In addition, the {id} parameter is set to optional for all routes.

Sample of Visual Basic Code routes.MapRoute("Default", _ "{controller}/{action}/{id}", _ New With {.controller = "Home", .action = "Index", .id = UrlParameter.Optional} ) Sample of C# Code routes.MapRoute("Default", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = UrlParameter.Optional } );

IP header UDP header L2TP header PPP header PPP payload (IP datagram)

You can add more than one route definition to the routing table. The routing engine will evaluate each route in order until it finds a match.

You can also specify that a particular route segment s value must match a constraint that you define. This might be the length of the segment, a date range, or any string data validation that you can define. If a URL does not meet the constraint, the route is not used to process the request. You define route constraints with regular expressions or by using objects that implement the IRouteConstraint interface. You then add each constraint to a RouteValueDictionary object and pass that to routes.MapRoute(). As an example, suppose you want to add a route definition that searches for the month/year numeric pattern in the URL (as in 12/2012). You could do as shown in the following code. This code creates default values for month and year based on the current month and year. It then sets a route constraint for each segment by using regular expressions.

bIsValid=true; } catch (Exception e) { bIsValid=false; } } } }

PPP payload (IP datagram)

Sample of Visual Basic Code routes.MapRoute("MonthYear", _ "{month}/{year}", _ New RouteValueDictionary(New With {.month = DateTime.Now.Month, .year = DateTime.Now.Year}), _ New RouteValueDictionary(New With {.month = "\d{2}", .year = "\d{4}"})) Sample of C# Code routes.MapRoute("MonthYear", "{month}/{year}", new RouteValueDictionary(new { month = DateTime.Now.Month, year = DateTime.Now.Year}), new RouteValueDictionary(new { month = @"\d{2}", year = @"\d{4}" }));

When you are done editing connections, click Close. The Web Parts are connected, just as if you had connected them statically.

1 . Why would you want to use Web Parts 2. Which component is required for all pages that use Web Parts 3. What component do you need to enable to allow a user to add new Web Parts

Both PPTP and L2TP/IPSec use PPP to provide an initial envelope for the data, and then append additional headers for transport through the internetwork. However, there are the following differences:

2. The WebPartManager control is required for all pages that use Web Parts. 3. The CatalogZone control enables a user to add new Web Parts to a page.

// IPostBackDataHandler related items follow. public event EventHandler TextChanged;

Web Parts support personalization. Personalization allows changes to the layout to be stored for each user so that the user sees the same layout the next time he or she goes to the page. Web Parts personalization relies on client-side cookies. It uses these cookies to look up settings in the ASPNETDB SQL Server database. Typically, when you store personalized settings, you will also want to authenticate users by using either Windows or Forms authentication. This is not required, however.