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Questions and Answers
The TCPClient class is used to create a server socket.
False
The BufferedReader is used to read input from the user.
True
The DataOutputStream is attached to the client socket.
True
The TCPServer class uses the ServerSocket to wait for client connections.
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The capitalizedSentence is sent back to the client through the DataInputStream.
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The clientSocket is closed at the end of the program.
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A server waits for a connection from a client before creating a TCP socket.
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A client repeatedly closes the connection with the server.
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The ServerSocket object in the server program is used to create a new connection with the client.
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The server communicates with the client before accepting a new connection.
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A client uses the ServerSocket object to connect to the server.
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The server repeatedly creates a new TCP socket for each client connection.
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When a client knows the server's name, IP address, and port, there is a correlation between send() and recv()
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The close() method is used to send an EOF (End of File) signal to the server
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TCP/IP transports application messages directly
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The sender and receiver do not need to agree on semantics in an application protocol
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All character encodings, such as ASCII and Unicode, are used to delimit strings
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Primitive types in application protocols include composed types such as messages with fields
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The termination character 0 is used to represent the end of a string in a Primitive Type.
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The Native representation of an integer in Primitive Types is always in Little-Endian format.
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The Big-Endian format is used for multi-byte, binary data exchange in networks.
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In Little-Endian machines, the first byte of the binary representation of a multibyte datatype is stored first.
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A message composed of fields can only have fixed-length fields.
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The $Mike$ field in the Message Composition is an example of a variable-length field.
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The socket created by the client in a TCP client-server interaction is used to establish a connection and then immediately closed.
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The server socket is used to accept new connections and then close the socket immediately.
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The OutputStream out is used to read data from the socket in a TCP client-server interaction.
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The close method is used to close the client socket in a TCP client-server interaction.
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The InputStream in is used to send data to the server in a TCP client-server interaction.
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The server socket is bound to a port before listening for new connections in a TCP client-server interaction.
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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.
