WCF Interview Questions

Introduction to WCF Interview Questions and Answers

WCF stands for the Windows communication foundation. It is a framework that will be used for building service-oriented applications. With the Windows Communication Foundation’s help, You can send any kind of asynchronous message from one point to another point. Different protocols can access the services, which all are created by WCF, for example, HTTP, TCP, msmq etc.

If you are looking for a job related to WCF, you need to prepare for the 2022 WCF Interview Questions. Every interview is indeed different as per the different job profiles. Here, we have prepared the important WCF Interview Questions and Answers, which will help you succeed in your interview.

In this 2022 WCF Interview Questions article, we shall present the 21 most important and frequently asked interview questions. These questions will help students build their concepts around WCF and help them to crack the interview. These questions are divided into two parts are as follows:

Part 1 – WCF Interview Questions (Basic)

This first part covers basic Interview Questions and Answers.

Q1. What do you mean by WCF?

Answer:
WCF (Windows Communication Foundation) is a framework that is used to build service-oriented applications.

Q2. Explain the fundamentals of WCF

Answer:
The fundamentals of WCF are given below:

• Unification – (COM+ Services, Web Services, .NET Remoting, Microsoft Message Queuing)
• Interoperability
• Service Orientation

Q3. What is the need for WCF?

Answer:
These are the basic WCF Interview Questions asked in an interview. We need WCF because different protocols will support the service created by using WCF.

Q4. What are the Features of WCF?

Answer:
Service Orientation, Interoperability, Service Metadata, Data Contracts, Security, Transactions, AJAX and REST Support, Extensibility.

Q5. Describe the advantages of WCF.

Answer:
Service-Oriented, location Independent, Language-Independent, Platform Independent, Support Multiple Operations, It supports all kinds of protocol.

Q6. What is the difference between WCF and Web Services?

Answer:
WCF is a framework used to build a service-oriented application, while Web Services are the application logic that will be accessed over the web protocols. Web Services will be hosted on the IIS, while WCF can be launched on IIS and self-hosted.

Q7. Explain about SOA?

Answer:
It stands for Service-oriented Architecture; It’s an architectural approach to software development.

Q8. What do you mean by service contract in WCF?

Answer:
A service contract is the service compatibility, and the customers’ need will be bound up with the service mechanism.

Q9. What are the components of the WCF application?

Answer:
WCF application consists of 3 components:

• WCF Service
• WCF Service Host
• WCF service client

Q10. What are the isolation levels provided in WCF?

Answer:
Isolation levels provided in WCF are given below:

• Read Uncommitted.
• Read Committed.
• Repeated read.

Part 2 – WCF Interview Questions (Advanced)

Let us now have a look at the advanced Interview Questions.

Q11. What is the various address format of WCF?

Answer:
Address format of WCF are given below:

• HTTP format
• TCP format
• MSMQ format

Q12. What do you mean by Data Contract Serializer?

Answer:
This is the frequently asked WCF Interview Questions in an interview. When the object instance changes into a portable and visible format, that process is known a Serialization and data serialization is also known as Datacontractserilizer.

Q13. Describe the binding in WCF?

Answer:
The binding in WCF are listed below:

• Basic HTTP Binding
• NetTcp Binding
• WSHttp Binding
• NetMsmq Binding

Q14. What is the namespace name used for the WCF service?

Answer:
ServiceModel service is used for WCF service.

Q15. What are the MEPs of WCF?

Answer:
The MEPs of WCF are given below:

• DataGram
• Request and Response
• Duplex

Q16. What kind of transaction manager is supported by WCF?

Answer: 
They are as follows:

• Lightweight
• WS- Atomic Transaction
• OLE

Q17. What are the different Data contracts in WCF?

Answer:
Different Data contacts in WCF are given below:

• Data Contact
• Data Member

Q18.What are the different instance modes of WCF?

Answer:
Different instance modes of WCF are given below:

• Per Call
• Per Session
• Single

Let us move to the next WCF Interview Questions.

Q19. What are the different ways of Hosting Webservices?

Answer:
The WCF service can be hosted in the following ways:

• IIS
• Self Hosting
• WAS (Windows Activation Service)
  

Q20. What are the different transport schemas supported by WCF?

Answer:
The transported schemas are given below:

• HTTP
• TCP
• Peer network
• IPC
• MSMQ
  

Q21. Explain different types of Contract defines in WCF?

Answer:
There are four contracts:

• Service Contracts
• Data Contracts
• Fault Contracts
• Message Contracts

Conclusion:

These are the above questions which are very important for WCF (Windows communication foundation), but you should have hands-on that. From a career perspective, it’s a very new and advanced technology and resources also not much available.

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