MCQs on Networking in Java | Java Networking
Explore Java Networking MCQs to deepen your understanding of key networking concepts, such as Sockets, Client-Server communication, Datagram and TCP/IP Sockets, and working with URLs and HTTP in Java. Perfect for Java developers and interview preparation!
MCQs on Networking in Java
Introduction to Sockets
- What is a socket in Java?
- a) A network connection point
- b) A buffer for storing data
- c) A thread for handling communication
- d) A type of object in Java
- Which class in Java is used to implement the client-side socket?
- a)
Socket - b)
ServerSocket - c)
DatagramSocket - d)
URLConnection
- a)
- Which method in the
Socketclass connects to a server?- a)
connect() - b)
open() - c)
establish() - d)
create()
- a)
- What does a
ServerSocketobject in Java do?- a) Connects to the server
- b) Listens for incoming client connections
- c) Sends data to the client
- d) Performs encryption on the data
- Which Java class is used for both client and server communication using TCP?
- a)
Socket - b)
DatagramSocket - c)
URL - d)
URLConnection
- a)
Client-Server Communication
- Which of the following classes is used by a client to send a request to a server in Java?
- a)
Socket - b)
ServerSocket - c)
URL - d)
URLConnection
- a)
- What is the main difference between the
SocketandServerSocketclasses in Java?- a)
Socketlistens for connections, whileServerSocketconnects to servers. - b)
ServerSocketlistens for incoming client requests, whileSocketis used to create a client connection. - c)
Socketis used for UDP, whileServerSocketis for TCP. - d)
ServerSocketis used for broadcasting, whileSocketis for unicast.
- a)
- In client-server communication, how does the server know which client is sending a message?
- a) By the IP address and port number
- b) By the client’s machine name
- c) By the server’s machine name
- d) By the client’s MAC address
- What is the first step in establishing a connection between a client and a server in Java?
- a) Creating a
ServerSocketobject - b) Opening a socket on the client-side
- c) Sending data to the server
- d) Binding the socket to a specific port
- a) Creating a
- Which of the following methods is used to send data from the client to the server using a
Socketobject?- a)
getOutputStream() - b)
writeData() - c)
send() - d)
transferData()
- a)
Datagram and TCP/IP Sockets
- Which type of socket is used for connectionless communication in Java?
- a) TCP socket
- b) UDP socket
- c) Multicast socket
- d) HTTP socket
- What does the
DatagramSocketclass use for communication in Java?- a) TCP
- b) UDP
- c) HTTP
- d) FTP
- What is the advantage of using UDP sockets over TCP sockets?
- a) More secure communication
- b) Reliable connection
- c) Faster transmission with no connection setup
- d) Guaranteed delivery of data
- What class is used to represent a packet of data in a
DatagramSocketcommunication?- a)
DatagramPacket - b)
PacketData - c)
DataPacket - d)
MessagePacket
- a)
- What does the
bind()method do inDatagramSocket?- a) It binds the socket to a specific port number.
- b) It establishes a connection with a client.
- c) It sends the data to the server.
- d) It receives the data from a server.
URL and HTTP in Java
- Which class in Java is used to work with URLs?
- a)
URLConnection - b)
Socket - c)
URL - d)
HttpURLConnection
- a)
- What is the main purpose of the
URLConnectionclass in Java?- a) To create sockets for client-server communication
- b) To connect a URL to a network protocol
- c) To read and write data to and from a URL
- d) To open a file in the system
- Which HTTP method is used to retrieve data from a specified URL in Java?
- a)
POST - b)
GET - c)
PUT - d)
DELETE
- a)
- In Java, how do you send a request to a URL using HTTP?
- a) By creating an
HttpURLConnectionobject and using thegetOutputStream()method. - b) By directly opening a socket to the URL.
- c) By creating a
URLobject and calling theconnect()method. - d) By creating a
URLConnectionand calling thegetResponseCode()method.
- a) By creating an
- What is the method used to read the response data from a URL in Java?
- a)
getInputStream() - b)
readData() - c)
getOutputStream() - d)
connect()
- a)
Additional Questions on Java Networking
- What class is used to open a TCP connection to a server in Java?
- a)
Socket - b)
DatagramSocket - c)
URLConnection - d)
ServerSocket
- a)
- Which of the following is true about Java’s
Socketclass?- a) It is used only for server-side communication.
- b) It can be used for both client-side and server-side communication.
- c) It can only handle UDP communication.
- d) It establishes HTTP connections.
- What is the role of
OutputStreamin Java socket programming?- a) It allows the server to accept incoming connections.
- b) It is used to write data to the server from the client.
- c) It establishes the client connection to the server.
- d) It reads incoming messages from the server.
- How do you ensure reliable communication in Java socket programming?
- a) By using
DatagramSocket - b) By using
ServerSocket - c) By using TCP sockets
- d) By using
URLclass
- a) By using
- Which of the following is used to represent the client-side socket in Java?
- a)
Socket - b)
ServerSocket - c)
DatagramSocket - d)
URL
- a)
- Which method is used to connect a
Socketobject to a remote server in Java?- a)
connect() - b)
bind() - c)
getInputStream() - d)
listen()
- a)
- What is the default port number for HTTP communication in Java?
- a) 8080
- b) 80
- c) 443
- d) 25
- What does the
setRequestMethod()method inHttpURLConnectiondo?- a) Sets the timeout duration for the request.
- b) Sets the method type (GET, POST, etc.) for the HTTP request.
- c) Sets the URL for the request.
- d) Sets the user-agent header for the request.
- Which of the following methods is used to send data to a URL in Java?
- a)
getOutputStream() - b)
getInputStream() - c)
openConnection() - d)
connect()
- a)
- What is the purpose of
getResponseCode()inHttpURLConnection?- a) It reads the body of the response.
- b) It checks the status of the connection.
- c) It returns the HTTP status code.
- d) It sets the request timeout.
Answer Table
| Qno | Answer |
|---|---|
| 1 | a) A network connection point |
| 2 | a) Socket |
| 3 | a) connect() |
| 4 | b) Listens for incoming client connections |
| 5 | a) Socket |
| 6 | a) Socket |
| 7 | b) ServerSocket listens for incoming client requests, while Socket is used to create a client connection. |
| 8 | a) By the IP address and port number |
| 9 | a) Creating a ServerSocket object |
| 10 | a) getOutputStream() |
| 11 | b) UDP socket |
| 12 | b) UDP |
| 13 | c) Faster transmission with no connection setup |
| 14 | a) DatagramPacket |
| 15 | a) It binds the socket to a specific port number. |
| 16 | c) URL |
| 17 | c) To read and write data to and from a URL |
| 18 | b) GET |
| 19 | a) By creating an HttpURLConnection object and using the getOutputStream() method. |
| 20 | a) getInputStream() |
| 21 | a) Socket |
| 22 | b) It can be used for both client-side and server-side communication. |
| 23 | b) It is used to write data to the server from the client. |
| 24 | c) By using TCP sockets |
| 25 | a) Socket |
| 26 | a) connect() |
| 27 | b) 80 |
| 28 | b) Sets the method type (GET, POST, etc.) for the HTTP request. |
| 29 | a) getOutputStream() |
| 30 | c) It returns the HTTP status code. |