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?

<p>static InetAddress getAllName(String hostname) (B)</p>
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Which of the following architectures uses a middle tier?

<p>none of the above (D)</p>
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Which of the following consists of interface within the java.net package?

<p>All of the above (D)</p>
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What is the port number assigned for FTP?

<p>21 (C)</p>
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What is the role of the getServerPort() method?

<p>Returns the port number on which this request was received. (D)</p>
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What is the default value for max_queue in the ServerSocket constructor?

<p>50 (D)</p>
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Which exception can be thrown by the URL constructor?

<p>MalformedUrlException (B)</p>
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Which option represents a multicast IP address?

<p>235.55.45.2 (D)</p>
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Which five parameters are needed to uniquely identify a connection?

<p>Local IP, Local PORT, Remote IP, Remote PORT, Protocol (A)</p>
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Which method is used to create a URL connection?

<p>openConnection (A)</p>
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What does the readLine() method return when it reaches the end of file?

<p>null (D)</p>
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Which class is used to create a TCP server?

<p>ServerSocket (A)</p>
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Which method of ServerSocket waits for a client to initiate communication?

<p>accept() (B)</p>
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Which method is used to retrieve the file name specified in a URL?

<p>getFile() (D)</p>
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Which class or classes are necessary to implement Datagram?

<p>None of the above (D)</p>
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What is the correct syntax for the getLocalHost() method?

<p>public static InetAddress getLocalHost() throws UnknownHostException (A)</p>
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Which method of DatagramPacket class is utilized to find the destination address?

<p>getAddress() (D)</p>
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Which classes support connection-oriented communication in Java?

<p>Socket &amp; ServerSocket (A)</p>
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How many class files will be created by the compiler if a program consists of three classes?

<p>Three (B)</p>
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Flashcards

UDP (User Datagram Protocol)

A connectionless protocol used for fast data transfer without error checking, often used for streaming audio and video.

Socket

A class that represents a network socket, which establishes a communication channel between two programs over a network.

TCP (Transmission Control Protocol)

A communication protocol that provides reliable, ordered delivery of data between two programs. It ensures that data is sent and received correctly, even in unreliable network environments.

ServerSocket

A class that is used to create a specific socket for a server to listen for incoming connections.

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What uses a 'middle tier'?

A 3-tier architecture (client, server, database) or a more complex n-tier architecture (multiple tiers) using a 'middle tier' for functionalities like business logic or application services.

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InetAddress

A class that provides methods to access and manipulate IP addresses and hostnames.

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Datagram

A representation of a data packet used for communication over a network, often exchanged using UDP.

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FTP (File Transfer Protocol)

The protocol used for file transfer over the internet, using port number '21.'

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Server Socket Max Queue

The ServerSocket constructor's "max_queue" argument determines the maximum number of client connections that can wait in the queue while the server is busy. The default value is 50.

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Malformed URL Exception

The "MalformedURLException" is thrown by the URL constructor if there is a problem with the URL format or syntax.

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Connection Oriented Communication

A connection oriented communication protocol allows two devices to establish a connection before sending data. This connection ensures reliability and ordering in communication.

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ServerSocket accept() Method

The "accept()" method in the ServerSocket class waits for an incoming connection from a client and returns a Socket object representing the connection.

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InetAddress getLocalHost()

The "getLocalHost()" method is used to retrieve the IP address of the local machine. It can throw an "UnknownHostException" if the local host cannot be determined.

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DatagramPacket getAddress()

The "getAddress()" method of the DatagramPacket class retrieves the address of the destination for the packet.

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URLConnection Class

The URLConnection class defines methods like "getContentLength()", "getDate()", and "getExpiration()" to obtain information about a resource accessed through a URL.

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URL getFile()

The "getFilename()" method of the URL class retrieves the file name specified in the URL.

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DNS Resolver

In the DNS (Domain Name System), a resolver translates a domain name into an IP address, allowing computers to navigate the internet based on easy-to-remember names.

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Java Permission Class

The "Permission" class in the java.security package is an abstract class. It is designed to represent different types of permissions.

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Security Class socketPermission()

The "socketPermission()" method is not a method belonging to the "Security" class.

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Java Compilation

The purpose of Java compilation is to translate high-level Java code into low-level bytecode, which can be understood by the Java Virtual Machine.

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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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