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, it is best for the program to use two threads. One thread can handle sending messages while the other thread handles receiving messages simultaneously. This approach is efficient as it saves time and provides a smoother user experience. Using more than two threads may cause unnecessary complexity and may not necessarily provide any additional benefits. Using only one thread would not allow for parallel processing of sending and receiving messages.

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

An EOFException is generated when the client attempts to read a value from a stream on which end-of-stream is detected. Choice A (EOF) and B (EOS) are not specific exceptions, and choice D (EOSException) is not a valid exception in Java.

Question 3

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

Accepted Answer

uneditable.&#10;

Question 4

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 block until a client attempts to connect. Once a client connects, the accept method returns a Socket object that the server can use to communicate with the client.

Question 5

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, meaning that data packets are transmitted without establishing a dedicated end-to-end connection beforehand. Choices A, B, and D are all true statements about types of transmission.

Question 6

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, specifying a port that is already in use or specifying an invalid port number will result in a SocketException being thrown.

Question 7

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 port number at which the server waits for connections is often referred to as the "handshake" point, as it is where the initial negotiation or "handshake" between the server and client occurs to establish a connection.

Question 8

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

Applets are restricted to accessing resources only on the server they were downloaded from or from servers explicitly listed in a cross-domain policy file. They cannot access resources on other servers.

Question 9

__________ 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

Stream sockets and the TCP protocol are more reliable and ensure data transmission in the correct order, making them preferred by most Java programmers.

Question 10

A(n) __________ 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

UnknownHostException is thrown when the hostname of the server provided by the client cannot be resolved to an IP address. It indicates that the network could not find the server corresponding to the provided hostname.

Question 11

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

The answer of Output __________ are typically used to increase...

Question 12

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...

Question 13

The Internet address 128.0.0.1 is also known as __________.&#10;A) localhost.&#10;B) remotehost.&#10;C) localserver.&#10;D) remoteserver.

Accepted Answer

The answer of The Internet address 128.0.0.1 is also known...

Deck 26: Networking