Question 1

To be able to send and receive messages in parallel over a network connection,a program must use __________ of execution.&#10;A)one thread.&#10;B)two threads.&#10;C)three threads.&#10;D)four threads.

Accepted Answer

To send and receive messages in parallel over a network connection, a program must use at least two threads, one for sending messages and another for receiving messages. By using two threads, the program can simultaneously send and receive messages, allowing for faster and more efficient communication. Using only one thread would mean that the program could only send or receive messages at a time, slowing down the communication process. Using three or four threads would not necessarily improve the performance of the program, as it would still only need one thread for sending and one for receiving.

Question 2

If an ObjectInputStream is used to read information from the server,an __________ is generated when the client attempts to read a value from a stream on which end-of-stream is detected.&#10;A)EOF.&#10;B)EOS.&#10;C)EOFException.&#10;D)EOSException.

Accepted Answer

When an ObjectInputStream detects end-of-stream, it generates an EOFException to indicate that the end of the stream has been reached. Therefore, the best choice is C, EOFException. Choices A and B are incorrect because they do not provide enough information about the specific exception that is generated. Choice D is also incorrect because there is no such exception as EOSException.

Question 3

Which statement is false?&#10;A)Streams-based transmission is connection-oriented.&#10;B)Connection-oriented transmission is like the telephone system.&#10;C)Datagram-based transmission is connection oriented.&#10;D)Connectionless transmission is like the way the mail is carried by the postal service.

Accepted Answer

Datagram-based transmission is connectionless, whereas connection-oriented transmission (like the telephone system) establishes a connection before transmitting data. Streams-based transmission can be either connection-oriented or connectionless depending on the protocol used. Choice A is therefore generally true, and choice D is generally accurate in that connectionless transmission (like the postal service) does not require a pre-established connection.

Question 4

The port number at which the server waits for connections is often called the __________ point.&#10;A)handhold.&#10;B)handshake.&#10;C)handoff.&#10;D)handle.

Accepted Answer

The term "handshake" is often used to describe the process of establishing a connection between a client and a server, including the negotiation of parameters and port numbers.

Question 5

A JEditorPane generates HyperlinkEvents only if it is __________.&#10;A)invisible.&#10;B)visible.&#10;C)uneditable.&#10;D)editable.

Accepted Answer

The answer of A JEditorPane generates HyperlinkEvents only if it...

Question 6

_________ is thrown when a String that is not in proper URL format is passed to a URL constructor.&#10;A)URLError.&#10;B)MalformedURLException.&#10;C)URLException.&#10;D)IllFormedURLException.

Accepted Answer

MalformedURLException is thrown when a String that is not in proper URL format is passed to a URL constructor.

Question 7

Specifying a port that is already in use or specifying an invalid port number when creating a DatagramSocket results in a __________.&#10;A)SocketException.&#10;B)PortInUseException.&#10;C)PortException.&#10;D)ConnectException.

Accepted Answer

When creating a DatagramSocket, if a port that is already in use or an invalid port number is specified, it results in a SocketException. Therefore, the correct answer is A.

Question 8

__________ sockets and the __________ protocol are more desirable for the vast majority of Java programmers.&#10;A)Stream,UDP.&#10;B)Stream,TCP.&#10;C)Datagram,UDP.&#10;D)Datagram,TCP.

Accepted Answer

For the vast majority of Java programmers, Stream sockets and the TCP protocol are more desirable because they provide reliable, ordered delivery of data and error detection, making them suitable for a wide range of applications such as file transfers, email, and web browsing. Datagram sockets and the UDP protocol, on the other hand, provide unreliable, unordered delivery of data without error detection or correction, making them better suited for applications where speed or efficiency is prioritized over reliability, such as online gaming or video streaming.

Question 9

Output __________ are typically used to increase the efficiency of an application by sending larger amounts of data fewer times.&#10;A)objects.&#10;B)broadcasters.&#10;C)buffers.&#10;D)None of the above.

Accepted Answer

Buffers are temporary storage areas that hold data until the system is ready to process it. By buffering data, an application can send larger amounts of data fewer times, thereby increasing efficiency.

Question 10

Once the ServerSocket is created,the server can listen indefinitely (or block)for an attempt by a client to connect.This is accomplished with a call to the ServerSocket method __________.&#10;A)connect.&#10;B)block.&#10;C)accept .&#10;D)listen.

Accepted Answer

The ServerSocket method "accept" allows the server to listen and wait for a client to connect. Once a client attempts to connect, the accept method will return a new Socket object that will be used to communicate with the client.

Question 11

Which statement is false? Normally,an applet __________.&#10;A)is allowed to read files only on the server from which the applet was downloaded.&#10;B)can read files on any server that can be reached over the network.&#10;C)cannot read files on the system on which it executes.&#10;D)has different file access rights than an application running on the same machine.

Accepted Answer

The answer of Which statement is false? Normally,an applet __________.&#10;A)is...

Question 12

__________ is thrown when a server address indicated by a client cannot be resolved.&#10;A)ConnectException.&#10;B)ServerException.&#10;C)MalformedURLException.&#10;D)UnknownHostException.

Accepted Answer

The answer of __________ is thrown when a server address...

Question 13

Using a URL as an argument to the __________ method of interface AppletContext causes the browser in which an applet is executing to display the URL.&#10;A)showURL.&#10;B)showFile.&#10;C)showHTML.&#10;D)showDocument.

Accepted Answer

The answer of Using a URL as an argument to...

Question 14

The Internet address 127.0.0.1 is also known as __________.&#10;A)localhost.&#10;B)remotehost.&#10;C)localserver.&#10;D)remoteserver.

Accepted Answer

The answer of The Internet address 127.0.0.1 is also known...

Question 15

Which statement is false?&#10;A)With datagram sockets a process establishes a connection to another process.&#10;B)The TCP protocol is used for transmission with stream sockets.&#10;C)The UDP protocol is used for transmission with datagram sockets.&#10;D)With the UDP protocol packets can be lost,duplicated or even arrive out of sequence.

Accepted Answer

The answer of Which statement is false?&#10;A)With datagram sockets a...

Deck 27: Networking