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Questions and Answers
The TCPClient class is used to create a server socket.
The TCPClient class is used to create a server socket.
False (B)
The BufferedReader is used to read input from the user.
The BufferedReader is used to read input from the user.
True (A)
The DataOutputStream is attached to the client socket.
The DataOutputStream is attached to the client socket.
True (A)
The TCPServer class uses the ServerSocket to wait for client connections.
The TCPServer class uses the ServerSocket to wait for client connections.
The capitalizedSentence is sent back to the client through the DataInputStream.
The capitalizedSentence is sent back to the client through the DataInputStream.
The clientSocket is closed at the end of the program.
The clientSocket is closed at the end of the program.
A server waits for a connection from a client before creating a TCP socket.
A server waits for a connection from a client before creating a TCP socket.
A client repeatedly closes the connection with the server.
A client repeatedly closes the connection with the server.
The ServerSocket object in the server program is used to create a new connection with the client.
The ServerSocket object in the server program is used to create a new connection with the client.
The server communicates with the client before accepting a new connection.
The server communicates with the client before accepting a new connection.
A client uses the ServerSocket object to connect to the server.
A client uses the ServerSocket object to connect to the server.
The server repeatedly creates a new TCP socket for each client connection.
The server repeatedly creates a new TCP socket for each client connection.
When a client knows the server's name, IP address, and port, there is a correlation between send() and recv()
When a client knows the server's name, IP address, and port, there is a correlation between send() and recv()
The close() method is used to send an EOF (End of File) signal to the server
The close() method is used to send an EOF (End of File) signal to the server
TCP/IP transports application messages directly
TCP/IP transports application messages directly
The sender and receiver do not need to agree on semantics in an application protocol
The sender and receiver do not need to agree on semantics in an application protocol
All character encodings, such as ASCII and Unicode, are used to delimit strings
All character encodings, such as ASCII and Unicode, are used to delimit strings
Primitive types in application protocols include composed types such as messages with fields
Primitive types in application protocols include composed types such as messages with fields
The termination character 0 is used to represent the end of a string in a Primitive Type.
The termination character 0 is used to represent the end of a string in a Primitive Type.
The Native representation of an integer in Primitive Types is always in Little-Endian format.
The Native representation of an integer in Primitive Types is always in Little-Endian format.
The Big-Endian format is used for multi-byte, binary data exchange in networks.
The Big-Endian format is used for multi-byte, binary data exchange in networks.
In Little-Endian machines, the first byte of the binary representation of a multibyte datatype is stored first.
In Little-Endian machines, the first byte of the binary representation of a multibyte datatype is stored first.
A message composed of fields can only have fixed-length fields.
A message composed of fields can only have fixed-length fields.
The $Mike$ field in the Message Composition is an example of a variable-length field.
The $Mike$ field in the Message Composition is an example of a variable-length field.
The socket created by the client in a TCP client-server interaction is used to establish a connection and then immediately closed.
The socket created by the client in a TCP client-server interaction is used to establish a connection and then immediately closed.
The server socket is used to accept new connections and then close the socket immediately.
The server socket is used to accept new connections and then close the socket immediately.
The OutputStream out is used to read data from the socket in a TCP client-server interaction.
The OutputStream out is used to read data from the socket in a TCP client-server interaction.
The close method is used to close the client socket in a TCP client-server interaction.
The close method is used to close the client socket in a TCP client-server interaction.
The InputStream in is used to send data to the server in a TCP client-server interaction.
The InputStream in is used to send data to the server in a TCP client-server interaction.
The server socket is bound to a port before listening for new connections in a TCP client-server interaction.
The server socket is bound to a port before listening for new connections in a TCP client-server interaction.
Flashcards
TCPClient class
TCPClient class
Used to create a client socket, not a server socket.
BufferedReader
BufferedReader
Reads input from a stream, like a user's keyboard.
DataOutputStream
DataOutputStream
Writes data to a stream, like sending data to a socket.
ServerSocket
ServerSocket
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capitalizedSentence
capitalizedSentence
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clientSocket
clientSocket
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Server waits first
Server waits first
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Client repeatedly closes
Client repeatedly closes
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ServerSocket creates new connection
ServerSocket creates new connection
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Server communicates first
Server communicates first
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Client uses ServerSocket
Client uses ServerSocket
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Server creates new socket per client
Server creates new socket per client
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send()/recv() correlation
send()/recv() correlation
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close() method sends EOF
close() method sends EOF
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TCP/IP transports directly
TCP/IP transports directly
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No agreement on semantics in App. Protocol
No agreement on semantics in App. Protocol
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String delimiters
String delimiters
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Primitive type composed types
Primitive type composed types
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termination character 0
termination character 0
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Little-Endian integer representation
Little-Endian integer representation
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Big-Endian network data
Big-Endian network data
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Study Notes
TCP Client-Server Interaction
- A TCP client creates a socket and connects to a server.
- The server creates a welcoming socket, waits for a client connection, and repeatedly accepts new connections, communicates, and closes the connection.
Java TCP Client
- import java.io.; and java.net.; are required.
- Create a socket, connect to the server, and create input and output streams.
- Read from the user, send to the server, read from the server, and print the response.
Java TCP Server
- import java.io.; and java.net.; are required.
- Create a welcoming socket, wait for a client connection, and create input and output streams.
- Read from the client, capitalize the sentence, and write to the client.
TCP Tidbits
- A client knows the server's name, IP address, and port.
- There is no correlation between send() and recv().
Closing a Connection
- close() is used to delimit/define communication.
- Analogous to EOF (end of file).
TCP/IP Byte Transport
- TCP/IP transports bytes.
- The application provides semantics.
- Asemantic network is used when one has knowledge that is best understood as a set of concepts that are related to one another.
Application Protocol
- Encode information in bytes.
- Sender and receiver must agree on semantics.
- Data encoding includes primitive types and composed types.
Primitive Types
- Strings:
- Character encoding: ASCII, Unicode, UTF.
- Delimit: length vs. termination character.
- Integers:
- Strings of character encoded decimal digits.
- Native representation: Little-Endian and Big-Endian.
Endian
- Little-Endian: stores the least significant value in the sequence first.
- Big-Endian: stores the most significant value in the sequence first.
Message Composition
- Message composed of fields.
- Fixed-length fields: integer.
- Variable-length fields: short, short, and strings.
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Description
This quiz tests your understanding of creating a Java TCP client socket, connecting to a server, and exchanging data using input and output streams.
