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WCF

100 WCF interview questions

Only coding challenges
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WCF Fundamentals


  • 1.

    What is Windows Communication Foundation (WCF)?

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  • 2.

    How is WCF different from ASP.NET Web Services?

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  • 3.

    What are the key features of WCF?

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  • 4.

    Explain the concept of service orientation in the context of WCF.

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  • 5.

    What is a service contract in WCF?

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  • 6.

    Define a data contract in WCF.

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  • 7.

    What are the ABCs of WCF?

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  • 8.

    What bindings are provided by WCF?

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  • 9.

    Explain WCF endpoint and its components.

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  • 10.

    How does WCF ensure interoperability?

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  • 11.

    What is the difference between a WCF service and a WCF client?

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  • 12.

    Describe WCF’s support for RESTful services.

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  • 13.

    How is security implemented in WCF?

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  • 14.

    What do you understand by multiple bindings in WCF?

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  • 15.

    Can you explain the role of interfaces in WCF?

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WCF Architecture and Execution


  • 16.

    Describe the WCF architecture.

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  • 17.

    Explain the WCF request-response service operation.

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  • 18.

    How do you host a WCF service?

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  • 19.

    What is the difference between hosting a WCF service in IIS and a Windows Service?

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  • 20.

    What are instance management techniques in WCF?

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  • 21.

    Explain concurrency management in WCF services.

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  • 22.

    What are the different instance modes in WCF?

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  • 23.

    How do you manage sessions in WCF services?

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  • 24.

    What are throttlings in WCF and how do they work?

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  • 25.

    Explain WCF Serialization and Deserialization.

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WCF Contracts


  • 26.

    What are the different types of contracts in WCF?

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  • 27.

    Explain the purpose of OperationContract attribute.

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  • 28.

    What is a Message Contract in WCF?

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  • 29.

    Can you modify a contract once it’s deployed? If so, how?

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  • 30.

    How do you handle versioning in WCF contracts?

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WCF Bindings and Configurations


  • 31.

    What are the different types of WCF bindings and their use cases?

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  • 32.

    How does WCF support different transport protocols?

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  • 33.

    Explain the difference between basicHttpBinding and wsHttpBinding.

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  • 34.

    How would you choose a binding for a WCF service?

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  • 35.

    What are custom bindings and when would you use them?

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  • 36.

    How are behaviors used in WCF?

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  • 37.

    Describe how to configure WCF services using configuration files.

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  • 38.

    What are the typical elements found in a WCF configuration file?

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WCF Security


  • 39.

    What are the different security modes in WCF?

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  • 40.

    How would you implement transport security in a WCF service?

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  • 41.

    What is message security and how is it different from transport security?

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  • 42.

    Can you implement both transport and message security in WCF?

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  • 43.

    Explain certificate-based security in WCF.

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WCF Faults and Exceptions


  • 44.

    How does error handling work in WCF?

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  • 45.

    What is a Fault Contract?

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  • 46.

    How do you pass user-defined error data from a service to a client?

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  • 47.

    Can you handle all exceptions uniformly in WCF clients?

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WCF Transactions


  • 48.

    How does WCF support transactions?

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  • 49.

    What is the purpose of the TransactionFlow attribute?

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  • 50.

    How can you ensure that a WCF service operation participates in a transaction?

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WCF Performance and Optimization


  • 51.

    How can you monitor WCF service performance?

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  • 52.

    Describe methods to improve WCF service performance.

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  • 53.

    How does caching work in WCF?

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  • 54.

    How can you limit the size of a message in WCF?

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  • 55.

    Explain how to manage large data transfers in WCF.

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WCF REST Services


  • 56.

    What is a WCF REST service?

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  • 57.

    How do you make AJAX calls to a WCF service?

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  • 58.

    What are URI templates in WCF services?

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  • 59.

    How does WCF support JSON and XML data?

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  • 60.

    What are the methods to consume RESTful services in WCF?

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Advanced WCF Topics


  • 61.

    How do you implement message queuing in WCF?

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  • 62.

    Describe duplex contracts in WCF.

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  • 63.

    How do you enable metadata exchange in WCF?

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  • 64.

    Explain the role of ServiceHost in WCF.

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  • 65.

    How do you use Data Transfer Objects (DTO) in WCF?

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WCF Extensibility


  • 66.

    How can you extend the functionality of WCF services?

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  • 67.

    What are Dispatchers and Channels in WCF?

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  • 68.

    How do you create custom bindings in WCF?

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  • 69.

    Explain the use of service behaviors and endpoint behaviors.

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  • 70.

    How do you implement a custom message inspector?

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WCF and Workflow Integration


  • 71.

    How do WCF and WF (Windows Workflow Foundation) integrate?

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  • 72.

    Can you expose a WF as a WCF service?

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  • 73.

    How do you handle long-running processes in WCF?

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  • 74.

    Explain correlation in WCF and WF services.

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  • 75.

    Describe State Machine Workflows with WCF services.

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WCF and .NET Framework


  • 76.

    How does WCF fit into the .NET Framework?

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  • 77.

    Explain the relationship between WCF and the .NET Core/Framework transition.

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  • 78.

    How do you migrate a WCF service to .NET Core?

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  • 79.

    Can you consume a WCF service from a .NET Core application?

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  • 80.

    What are the considerations for backward compatibility in WCF?

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WCF Testing and Debugging


  • 81.

    How do you test a WCF service?

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  • 82.

    What tools are available for debugging WCF services?

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  • 83.

    How do you enable message logging in WCF?

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  • 84.

    What is the WCF Test Client and how do you use it?

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  • 85.

    How do you simulate service faults for testing purposes?

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WCF in Distributed Systems


  • 86.

    How does WCF work with distributed transactions?

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  • 87.

    Describe the scalability options with WCF services.

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  • 88.

    Explain how WCF services can be load balanced.

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  • 89.

    What is the role of WCF in SOA (Service-Oriented Architecture)?

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  • 90.

    How do you handle state management in a scaled-out WCF service?

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WCF Best Practices


  • 91.

    What are considered best practices for WCF service design?

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  • 92.

    How do you ensure that a WCF service is secure?

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  • 93.

    What are the dos and don’ts when configuring WCF services?

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  • 94.

    How should you handle reusable logic in WCF?

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  • 95.

    What are some common anti-patterns in WCF to avoid?

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Contemporary Uses of WCF


  • 96.

    How is WCF being used in modern enterprises?

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  • 97.

    What are the future prospects for WCF with the advent of microservices and containerization?

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  • 98.

    How does WCF compare to newer frameworks like gRPC for service communication?

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  • 99.

    In what scenarios would you still recommend using WCF?

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  • 100.

    Can you describe a successful migration from a WCF service to a different communication framework or architecture?

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