MCQ Questions & Answers – Networking – Datagrams

This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Networking – Datagrams”.

1. Which of these is a bundle of information passed between machines?
a) Mime
b) Cache
c) Datagrams
d) DatagramSocket
View Answer

Answer: c
Explanation: The Datagrams are the bundle of information passed between machines.

2. Which of these class is necessary to implement datagrams?
a) DatagramPacket
b) DatagramSocket
c) All of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

3. Which of these method of DatagramPacket is used to find the port number?
a) port()
b) getPort()
c) findPort()
d) recievePort()
View Answer

Answer: b
Explanation: None.

4. Which of these method of DatagramPacket is used to obtain the byte array of data contained in a datagram?
a) getData()
b) getBytes()
c) getArray()
d) recieveBytes()
View Answer

Answer: a
Explanation: None.

5. Which of these methods of DatagramPacket is used to find the length of byte array?
a) getnumber()
b) length()
c) Length()
d) getLength()
View Answer

Answer: d
Explanation: getLength returns the length of the valid data contained in the byte array that would be returned from the getData () method. This typically is not equal to length of whole byte array.

6. Which of these class must be used to send a datagram packets over a connection?
a) InetAdress
b) DatagramPacket
c) DatagramSocket
d) All of the mentioned
View Answer

Answer: d
Explanation: By using 5 classes we can send and receive data between client and server, these are InetAddress, Socket, ServerSocket, DatagramSocket, and DatagramPacket.

7. Which of these method of DatagramPacket class is used to find the destination address?
a) findAddress()
b) getAddress()
c) Address()
d) whois()
View Answer

Answer: b
Explanation: None.

8. Which of these is a return type of getAddress() method of DatagramPacket class?
a) DatagramPacket
b) DatagramSocket
c) InetAddress
d) ServerSocket
View Answer

Answer: c
Explanation: None.

9. Which API gets the SocketAddress (usually IP address + port number) of the remote host that this packet is being sent to or is coming from.
a) getSocketAddress()
b) getAddress()
c) address()
d) none of the mentioned
View Answer

Answer: a
Explanation: getSocketAddress() is used to get the socket address.

MCQ “URL Class"

This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “URL Class”.

1. What does URL stands for?
a) Uniform Resource Locator
b) Uniform Resource Latch
c) Universal Resource Locator
d) Universal Resource Latch
View Answer

Answer: a
Explanation: URL is Uniform Resource Locator.

2. Which of these exceptions is thrown by URL class’s constructors?
a) URLNotFound
b) URLSourceNotFound
c) MalformedURLException
d) URLNotFoundException
View Answer

Answer: c
Explanation: None.

3. Which of these methods is used to know host of an URL?
a) host()
b) getHost()
c) GetHost()
d) gethost()
View Answer

Answer: b
Explanation: None.

4. Which of these methods is used to know the full URL of an URL object?
a) fullHost()
b) getHost()
c) ExternalForm()
d) toExternalForm()
View Answer

Answer: d
Explanation: None.

5. Which of these class is used to access actual bits or content information of a URL?
a) URL
b) URLDecoder
c) URLConnection
d) All of the mentioned
View Answer

Answer: d
Explanation: URL, URLDecoder and URLConnection all there are used to access information stored in a URL.

6. What will be the output of the following Java code?

1.     import java.net.*;

2.     class networking 

3.     {

4.         public static void main(String[] args) throws MalformedURLException 

5.         {

6.             URL obj = new URL("https://www.sanfoundry.com/javamcq");

7.             System.out.print(obj.getProtocol());

8.         }

9.     }

a) http
b) https
c) www
d) com
View Answer

Answer: a
Explanation: obj.getProtocol() is used to know the protocol used by the host. http stands for hypertext transfer protocol, usually 2 types of protocols are used http and https, where s in https stands for secured.
Output:

$ javac networking.java
$ java networking 
http

7. What will be the output of the following Java program?

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1.     import java.net.*;

2.     class networking 

3.     {

4.         public static void main(String[] args) throws MalformedURLException 

5.         {

6.             URL obj = new URL("https://www.sanfoundry.com/javamcq");

7.             System.out.print(obj.getPort());

8.         }

9.     }

a) 1
b) 0
c) -1
d) garbage value
View Answer

Answer: c
Explanation: Since we have not explicitly set the port default value that is -1 is printed.
Output:

$ javac networking.java
$ java networking 
-1

8. What will be the output of the following Java program?

1.     import java.net.*;

2.     class networking

3.     {

4.         public static void main(String[] args) throws MalformedURLException 

5.         {

6.             URL obj = new URL("https://www.sanfoundry.com/javamcq");

7.             System.out.print(obj.getHost());

8.         }

9.     }

a) sanfoundry
b) sanfoundry.com
c) www.sanfoundry.com
d) https://www.sanfoundry.com/javamcq
View Answer

Answer: c
Explanation: None.
Output:

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$ javac networking.java
$ java networking 
www.sanfoundry.com

9. What will be the output of the following Java program?

1.     import java.net.*;

2.     class networking

3.     {

4.         public static void main(String[] args) throws MalformedURLException

5.         {

6.             URL obj = new URL("https://www.sanfoundry.com/javamcq");

7.             System.out.print(obj.toExternalForm());

8.         }

9.     }

a) sanfoundry
b) sanfoundry.com
c) www.sanfoundry.com
d) https://www.sanfoundry.com/javamcq
View Answer

Answer: d
Explanation: toExternalForm() is used to know the full URL of an URL object.
Output:

$ javac networking.java
$ java networking 
https://www.sanfoundry.com/javamcq

Reference

MCQ

 MCQ No - 1

Which class creates a TCP server socket, bound to the specified port?

(A) Socket

(B) InetAddress

(C) ServerSocket

(D) DatagramSocket

C

MCQ No - 2

Which class implements a connectionless packet delivery service.

(A) ServerSocket

(B) DatagramSocket

(C) InetAddress

(D) DatagramPacket

D

MCQ No - 3

Which method of URL class returns the object of URLConnection class?

(A) getLocalHost()

(B) openConnection()

(C) getByName(String host)

(D) getHostAddress()

B

MCQ No - 4

A Socket Consists Of?

(A) Port+IP address

(B) Only IP address

(C) only Port address

(D) None of these

A

MCQ No - 5

Which method is establish a connection between server and client?

(A) accept()

(B) open()

(C) getLocalHost()

(D) openConnection()

A

MCQ No - 16

DatagramSocket() throws

(A) IOException

(B) UnknownHostException

(C) ClassNotFoundException

(D) SocketException

D

MCQ No - 17

UnknownHostException is immediate child class of_______?

(A) java.lang.Exception

(B) java.lang.IOException

(C) java.lang.Throwable

(D) java.lang.Object

B

MCQ No - 18

Port numbers range from _____ to ______.

(A) 0 to 65535

(B) 1 to 65536

(C) -65535 to 65536

(D) 0 to 1024

A

MCQ No - 19

_________ Protocol is more efficient in terms of both latency and bandwidth.

(A) TCP

(B) UDP

(C) SMTP

(D) FTP

B

MCQ No - 20

Which of the following is NOT true about User Datagram Protocol in transport layer?

(A) Works well in unidirectional communication, suitable for broadcast information.

(B) It does three way handshake before sending datagrams.

(C) It provides datagrams, suitable for modeling other protocols such as in IP tunneling or Remote Procedure Call and the Network File System.

(D) The lack of retransmission delays makes it suitable for real-time applications.

B

Reference