C# Questions & Answers on Network Errors Handling for Freshers

1. What exception is thrown if the URI format is invalid?

a) URLNotFound
b) URLSourceNotFound
c) MalformedURLException
d) UriFormatException

Answer: d

2. What exception is thrown if the protocol supported by URI prefix is invalid?

a) URLNotFound
b) URLSourceNotFound
c) UriFormatException
d) NotSupportedException

Answer :d

3. What exception is thrown if the user does not have a proper authorization?

a) URLNotFound
b) URLSourceNotFound
c) System.Security.SecurityException
d) All of the mentioned

Answer: c

4. Choose the exceptions generated by the Create() method defined by WebRequest:

a) NotSupportedException
b) UriFormatException
c) System.Security.SecurityException
d) All of the mentioned

Answer: d

5. Choose the exceptions generated by the GetReponse() method defined by WebRequest:

a) InvalidOperationException
b) ProtocolViolationException
c) WebException
d) All of the mentioned

Answer: d

Explanation: By definition.

6. Select the properties related to the network errors generated by WebException:

a) response
b) get
c) set
d) none of the mentioned

Answer: a

Explanation: WebException has two properties that relate to network errors:
Response and Status.
We can obtain a reference to the WebResponse object inside an exception handler through the Response property. For the HTTP protocol, this object describes the error. It is defined like this:
public WebResponse Response { get; }
When an error occurs, we can use the Status property of WebException to find out what went wrong. It is defined like this:
public WebExceptionStatus Status {get; }

7. Which of these classes is used for operating on the request from the client to the server?

a) http
b) httpDecoder
c) httpConnection
d) httpd

Answer: d

8. Choose the exceptions generated by the GetResponseStream() method defined by WebRequest:

a) ProtocolViolationException
b) ObjectDisposedException
c) IOException
d) All of the mentioned

Answer: d

9. Which of these classes is used to create servers that listen to either local or remote client programs?

a) httpServer
b) ServerSockets
c) MimeHeader
d) HttpResponse

Answer: b

10. Which of these methods gives the full URL of an URL object?

a) fullHost()
b) getHost()
c) AbsoluteUri
d) toExternalForm()

Answer: c