Java Networking Protocols Quiz

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Questions and Answers

What does UDP stand for?

Used Data Provider

User Data Protocol

User Data Port

User Datagram Protocol (correct)

Which class is used to create a listening port for a server?

Socket

Server

SocketServer

ServerSocket (correct)

Communication using TCP protocol is characterized as:

Collection less, concurrent

Connection oriented, Iterative

Connection oriented, concurrent (correct)

Connection less, Iterative

Which of these methods is NOT a factory method of the InetAddress class?

static InetAddress getAllName(String hostname) Signup and view all the answers

Which of the following architectures uses a middle tier?

none of the above Signup and view all the answers

Which of the following consists of interface within the java.net package?

All of the above Signup and view all the answers

What is the port number assigned for FTP?

21 Signup and view all the answers

What is the role of the getServerPort() method?

Returns the port number on which this request was received. Signup and view all the answers

What is the default value for max_queue in the ServerSocket constructor?

50 Signup and view all the answers

Which exception can be thrown by the URL constructor?

MalformedUrlException Signup and view all the answers

Which option represents a multicast IP address?

235.55.45.2 Signup and view all the answers

Which five parameters are needed to uniquely identify a connection?

Local IP, Local PORT, Remote IP, Remote PORT, Protocol Signup and view all the answers

Which method is used to create a URL connection?

openConnection Signup and view all the answers

What does the readLine() method return when it reaches the end of file?

null Signup and view all the answers

Which class is used to create a TCP server?

ServerSocket Signup and view all the answers

Which method of ServerSocket waits for a client to initiate communication?

accept() Signup and view all the answers

Which method is used to retrieve the file name specified in a URL?

getFile() Signup and view all the answers

Which class or classes are necessary to implement Datagram?

None of the above Signup and view all the answers

What is the correct syntax for the getLocalHost() method?

public static InetAddress getLocalHost() throws UnknownHostException Signup and view all the answers

Which method of DatagramPacket class is utilized to find the destination address?

getAddress() Signup and view all the answers

Which classes support connection-oriented communication in Java?

Socket & ServerSocket Signup and view all the answers

How many class files will be created by the compiler if a program consists of three classes?

Three Signup and view all the answers

Study Notes

UDP and TCP Protocols

UDP stands for User Datagram Protocol
TCP stands for Transmission Control Protocol
TCP is connection-oriented, meaning a connection is established before data transmission. This is reliable but slower.
UDP is connectionless, meaning no connection is established before sending data. This is faster but unreliable.

Java Networking Classes

ServerSocket : Used to create a listening port for a server in TCP communication.
Socket : Used to create a connection to a server in TCP communication.
DatagramSocket : Used for creating a socket to communicate using the UDP protocol
DatagramPacket : Used for sending and receiving data using UDP.
InetAddress : Encapsulates both numerical IP address and the domain name for that address. Methods like getLocalHost() retrieve local machine's information.

Port Numbers

FTP uses port 21
Other ports are mentioned for various protocols.

DNS (Domain Name System)

DNS maps domain names to IP addresses.
DNS is a crucial system for resolving names to numerical addresses for communication.

Methods and Functionality

WriteUTF(): Writes a string to an output stream.
readLine(): Reads a line from an input stream. Returns null at end of file.
getServerPort(): Returns the port number a request was received on.
accept(): Waits for a client to connect in a server socket.
getFile(): Retrieves the file name specified in a URL.
open Connection(): Used to create URL connection.

Additional Information

MalformedURLException: An exception thrown by the URL constructor if the URL is invalid.
Multicast IP addresses and their formats are referenced, but the question details did not require the specific format for a multicast address.
max_queue defaults to 50 in the ServerSocket constructor that takes a max_queue parameter.
A connection is uniquely identified by local and remote IP addresses, local and remote port numbers, and the protocol.
Java programs with multiple classes generate separate class files for each class upon compilation.
socketPermission, filePermission, and dataPermission are methods from the security class.
TCP does not support multicasting because it's a connection-oriented protocol.
TCP is a reliable and connection-oriented protocol.

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Description

This quiz covers key concepts of networking protocols such as UDP and TCP in Java. You'll explore the differences between these protocols, Java networking classes, and important port numbers. Test your knowledge on how networking is implemented in Java.