# System.ServiceModel.Channels

``` diff
 namespace System.ServiceModel.Channels {
     public class HttpTransportBindingElement : TransportBindingElement {
+        public ExtendedProtectionPolicy ExtendedProtectionPolicy { get; set; }
     }
+    public interface ISecurityCapabilities {
+        ProtectionLevel SupportedRequestProtectionLevel { get; }
+        ProtectionLevel SupportedResponseProtectionLevel { get; }
+        bool SupportsClientAuthentication { get; }
+        bool SupportsClientWindowsIdentity { get; }
+        bool SupportsServerAuthentication { get; }
+    }
     public class SslStreamSecurityBindingElement : BindingElement {
+        public bool RequireClientCertificate { get; set; }
     }
 }
```

