A self-hosted Windows Communication Foundation (WCF) service uses a secure HTTP binding with a custom principal permission mode. The binding requires users to provide their Windows logon credentials. You need to retrieve the identity of the caller.What are two possible properties you can use to achieve this goal? (Each correct answer presents a complete solution Choose two)（）

多项选择题You are creating an ASP.NET web application that hosts several Windows Communication Foundation (WCF) services. The services have ASP.NET Compatibility Mode enabled. Users authenticate with the Web application by using a cookie-based ASP.NET Forms Authentication model. You add a service file named Authentication.svc that contains the following code segment: <%@ ServiceHost Service= System.Web.ApplicationServices.AuthenticationService Factory= System.Web.ApplicationServices.ApplicationServicesHostFactory %> You need to ensure that users can access the WCF services without having to re-authenticate. Which two configuration settings should you add? (Each is part of a complete solution. Choose two.)（）

A. In the system web. Extensions scripting/webServices/authenticationService element, set the enabled attribute to true.
B. In the system web. Extensions scripting/webServices/profileService element, set the enabled attribute to true.
C. Add a service endpoint with basicHttpBinding for the contract System.Web.ApplicationServices.AuthenticationService.
D. Add a custom service behavior named AuthenticationService Type Behaviors with a service AuthenticationManager element that has service AuthenticationManagerType set to System.Web.Security.SQL Membership Provider

单项选择题You have a self-hosted Windows Communication Foundation (WCF) service. You need to configure the service to provide an X509 certificate during authentication. What should you use to configure the service?（）

A. the Certificate property of the X509 Certificate lnitiator Service Credential class
B. the SetCertificate method of the X509 Certificate Initiator Service Credential class
C. the SetCertificate method of the X509 Certificate Recipient Service Credential class
D. the TrustedStoreLocation property of the X509 Certificate Recipient Service Credential class

单项选择题You are creating a Windows Communication Foundation (WCF) service based on WSHttpBinding. New audit requirements dictate that callers must be authenticated on every call to ensure that their credentials have not been revoked.You need to ensure that the service will not cache the security request token. What should you do?（）

A. Apply a ServiceBehavior attribute to the service implementation class with the lnstanceContextMode property set to Single.
B. In the message security configuration, change clientCredentialType from lssuedToken to UserName
C. In the message security configuration, set establishSecurityContext to false.
D. At the end of every operation, call the SessionStateUtility.RaiseSessionEnd method.

单项选择题You are using Windows Communication Foundation (WCF) to create a service. You need to implement a custom message-level security binding element. Which binding element should you use?（）

A. Transport Security Binding Element
B. Https Transport Binding Element
C. Ssl Stream Secunty Binding Element
D. Windows Stream Security Binding Element

单项选择题A Windows Communication Foundation (WCF) service sends notifications when the service is started and stopped.You need to implement a client that logs these notifications. Which class should you use?（）

A. AnnouncementService
B. AnnouncementClient
C. DiscoveryClient
D. HttpListener