Common WCF Interview Questions and Answers

Top WCF Interview Questions and Answers for 2022

1. What does WCF mean? 

WCF stands for Windows Communication Foundation. It is essentially a framework for building and configuring service-oriented applications. 

2. What is SOA? 

The Service Oriented Architecture, or SOA, expresses that each component of a system must be a service. It also states that though the system should be formed with several loosely coupled services, each service should be independent. The services should not affect each other in case of a malfunction in any one of them. 

3. What are WCF service endpoints? 

A service endpoint is a part of the service hosted by an application. The endpoint can also be a client receiving the messages. Endpoints provide clients with all the functions available in an application through the WCF. 

4. What are the fundamentals of WCF? 

There are three main fundamentals of WCF: 

• Service Orientation, 
• Unification, and 
• Interoperability. 

5. Explain the important components used in WCF. 

There are three main components in WCF - the service, the host, and the endpoints. The working logic is referred to as the service; the path where the data is saved is known as the host, and the endpoints are the manner in which the services are presented to the outside world. 

6. What are the advantages of WCF? 

There are a number of advantages of the windows communication foundation or the WCF. They include: 

• The WCF is platform oriented. 
• It is known to support most of the protocols. 
• It is service-oriented.
• The WCF supports multiple operations.
• It is both location and language independent. 

7. How does WCF work? 

The WCF follows a method of looking at the software as a service. According to this model, all functioning units are described as services. 

8. What are the three major points in WCF? 

The three major points in WCF are the address, contract, and binding. 

The address defines the location of the services. The contract specifies the interface between the client and the service. And the binding defines how the two parties, the client and the service, will communicate with each other. 

9. How many types of contracts does WCF define? 

The WCF defines the following contracts: 

• Fault contracts
• Service contracts 
• Data contracts 
• Message contracts 

10. What are the different types of transaction managers supported by WCF? 

The WCF supports the OLE, WS-Automic, and Light Weight transaction managers. 

11. What is WCF ABC? 

The WCF ABC refers to the Address, Binding, and Contracts. The address is the exact location where the host is located. Binding refers to how the client and the service will communicate with the use of encoding and transport protocols. The exact content of the service is mentioned in the contracts. 

12. What are default endpoints? 

In a situation where the service has one base address but no defined endpoints, the WCF will provide it with default endpoints. 

13. What are service contracts in WCF? 

A service contract defines service compatibility. The user need is matched with the mechanism of the service. 

14. What is the binding property of endpoints in WCF? 

The binding property of endpoints is used to define the service transport, protocols, and encodings. Each binding has a minimum of one transport and one message encoding element. 

15. What is a service proxy in WCF?

The service is the set of functions performed for the client. Service proxies are a way to form communication between the client and the server. The main form of communication here are requests and responses. 

16. What are the various address formats of WCF? 

The various address formats used include: 

• HTTP
• MSMQ
• TCP

17. What are the requirements for hosting a WCF service? 

To host a WCF service, a configured endpoint, a managed process, and a ServiceHost instance is required. The following approaches can also be considered: 

• Hosting on a web server
• Windows service 
• Console application 
• Windows application 

18. What are standard endpoints? 

A set of pre-defined endpoints provided by the WCF for metadata exchange, web, and discovery, are known as standard endpoints. Config file and programmatically can both be used to configure the standard endpoints. 

FAQs

1. What are the main components of WCF? 

The WCF has three main components - Service, Host, and Endpoint. 

2. What is WCF used for? 

The WCF is primarily used for building service-oriented applications. It is used to send data in the form of messages from one endpoint to the other. 

3. What are the bindings in WCF?

The binding property of endpoints is used to define the service transport, protocols, and encodings. The binding defines how the two parties, the client and the service, will communicate with each other. 

4. What are the endpoints in WCF?

A service endpoint is a part of the service hosted by an application. The endpoint can also be a client receiving the messages. Endpoints provide clients with all the functions available in an application through the WCF. 

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Conclusion

WCF is a great career direction for many. If you are preparing any WCF interview questions, make sure to go through our list to gain additional information. These questions and answers are related to the entire Windows communications foundation process. 

You can also check out the Post Graduate Program in Full Stack Web Development from Simplilearn to help upskill yourself. This program will provide you with additional knowledge and give your resume a kick. 

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