(Interview).NET Interview Questions:.NET Remoting

.NET Interview Questions

.NET Remoting

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?
Each process is allocated its own block of available RAM space, 
no process can access another 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 different between 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 same application (5 copies of Word running), 
but 1 process can run just 1 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 Frame 
work Class Library,note worthy classe 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 information when you control 
both ends of the application. Use Web services for open-protocol-based 
information 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 between 
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 one application domain to another and from one computer to 
another, as well as one process to another on the same 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 one end, and deserializing and decoding messages 
into data on the other end.
12. Choosing between HTTP and TCP for protocols and Binary and SOAP 
for formatters, what are 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 one 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 define 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.