Asp.Net interview Questions and Answers Part 7

1.) What is WCF Services in asp.net ?                                                                                   
WCF is a set of .NET Technologies that is used for creation and consumption of data services in a website.It helps the developers to build secure and reliable applications (websites).It Provides common platform for building service oriented application.

2.) What were technologies(protocol,services) used by Microsoft before WCF ? 

1. Web services (.asmx)
2. Web Service Enhancements (WSE)
3. .NET Remoting
4. Microsoft message queuing (MSMQ)

3.) What are advantage of  WCF  services in asp.net ?                                                    

The advantage of WCF over the previous technologies is that,it provides a common run time environment for the services.thereby, providing interoperability between services.

4.) What are layer Architectures used in WCF ?                                                               

1. Contract layer
2. Service Runtime layer
3. Messaging layer
4. Activation and Hosting Layer

5.) What are the Features of WCF Services  ?                                                                    

• End point support
• Enhanced transport layer
• Queuing support
• Improved security
• Improved transaction process
• Support for hosting WCF Service on various servers.
• Ajax integration and java script object notation(JSON Support)

6.) What is activation and hosting architecture in  WCF  ?                               

The activation and hosting layer renders various options for the services in which they can be activated as well as hosted. 

7.) Which type of Hosting used in WCF  ?                                                           

• Self hosting (ex. window application,window service,console application.)
• External server hosting (ex. IIS ,WAS)

8.) Which programming model is used in WCF  ?                                               

•  Unified programming model

9.) What are the services provided by the WCF  ?                                                

• Message queuing 
• .NET Remoting
• Distribute Transactions
• Web services in single services -oriented programming model for distributed application.

10.) What are the main terms of WCF services in .NET ?                                                
End Point:- An end point is a resource on a network through which message can be sent.This service in WCF are responsible for enabling communication between the client and service.

• Address:-An address is a location that define s where message can be sent.
• Binding:-It specify protocol (way of communication mechanism )communication between WCF and client application.You already know, protocol is set of rules.
• Contract:- It specify the service name being provide by WCF Services.

11.) What types of  Contracts used in WCF services  ?                                                 

• [Service contract]
• [Operation Contract]
• [Data Contract] and [Data Member]

12.) Which of the layers are provided action and hosting options in WCF    ?  

• Window Activation Service (WAS)
• Web Services
• .EXE
• COM+

13.) What is difference between web services and  WCF services in .NET ?        
More details...

14.) Is WCF Services an Enhancement of web services in .NET ?                          
Yes.