Visvesvaraya Technological University (VTU) 2007 M.C.A interview of .net - Question Paper

1. What’s a Windows process? It’s an application that’s running and had been allocated memory.
2. What’s typical about a Windows process in regards to memory allocation? every process is allocated its own block of available RAM space, no process can access a different process’ code or data. If the process crashes, it dies alone without taking the entire OS or a bunch of other applications down.
3. Why do you call it a process? What’s various ranging from process and application in .NET, not common computer usage, terminology? A process is an instance of a running application. An application is an executable on the hard drive or network. There can be numerous processes launched of the identical application (5 copies of Word running), but one process can run just one application.
4. What distributed process frameworks outside .NET do you know? Distributed Computing Environment/Remote Procedure Calls (DEC/RPC), Microsoft Distributed Component Object Model (DCOM), Common Object Request Broker Architecture (CORBA), and Java Remote Method Invocation (RMI).
5. What are possible implementations of distributed applications in .NET? .NET Remoting and ASP.NET Web Services. If we talk about the Framework Class Library, noteworthy classes are in System.Runtime.Remoting and System.Web.Services.
6. When would you use .NET Remoting and when Web services? Use remoting for more efficient exchange of info when you control both ends of the application. Use Web services for open-protocol-based info exchange when you are just a client or a server with the other end belonging to someone else.
7. What’s a proxy of the server object in .NET Remoting? It’s a fake copy of the server object that resides on the client side and behaves as if it was the server. It handles the communication ranging from real server object and the client object. This process is also known as marshaling.
8. What are remotable objects in .NET Remoting? Remotable objects are the objects that can be marshaled across the application domains. You can marshal by value, where a deep copy of the object is created and then passed to the receiver. You can also marshal by reference, where just a reference to an existing object is passed.
9. What are channels in .NET Remoting? Channels represent the objects that transfer the other serialized objects from 1 application domain to a different and from 1 computer to another, as well as 1 process to a different on the identical box. A channel must exist before an object can be transferred.
10. What security measures exist for .NET Remoting in System.Runtime.Remoting? None. Security should be taken care of at the application level. Cryptography and other security techniques can be applied at application or server level.
11. What is a formatter? A formatter is an object that is responsible for encoding and serializing data into messages on 1 end, and deserializing and decoding messages into data on the other end.
12. Choosing ranging from HTTP and TCP for protocols and Binary and SOAP for formatters, elaborate the trade-offs? Binary over TCP is the most effiecient, SOAP over HTTP is the most interoperable.
13. What’s SingleCall activation mode used for? If the server object is instantiated for responding to just 1 single request, the request should be made in SingleCall mode.
14. What’s Singleton activation mode? A single object is instantiated regardless of the number of clients accessing it. Lifetime of this object is determined by lifetime lease.
15. How do you describe the lease of the object? By implementing ILease interface when writing the class code.
16. Can you configure a .NET Remoting object via XML file? Yes, via machine.config and application level .config file (or web.config in ASP.NET). Application-level XML settings take precedence over machine.config.
17. How can you automatically generate interface for the remotable object in .NET with Microsoft tools? Use the Soapsuds tool.

Earning:   Approval pending.