Network Prog Ch 5: Socket Programming Overview
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Questions and Answers

What is the primary goal of socket programming?

  • To create complex user interfaces
  • To establish secure communication over the Internet
  • To learn how to build client/server applications that communicate using sockets (correct)
  • To develop standalone applications without networking capabilities

Which socket type is designed for reliable, byte stream-oriented communication?

  • TCP socket (correct)
  • UDP socket
  • Datagram socket
  • Stream socket

In the provided application example, what operation does the server perform on the data received from the client?

  • Converts characters to lowercase
  • Logs the data for auditing
  • Encrypts the data
  • Converts characters to uppercase (correct)

What aspect is controlled by the operating system in socket programming?

<p>Transport network (A)</p> Signup and view all the answers

What are the two types of transport services used in socket programming?

<p>Reliable and unreliable (B)</p> Signup and view all the answers

What does the server do after receiving the 'SEND' command from the client?

<p>Opens a file named 'from_client' for writing. (B)</p> Signup and view all the answers

How does the server read the data sent by the client during a file transfer?

<p>Using a loop that reads 1 K byte each time. (B)</p> Signup and view all the answers

What is the purpose of clientSocket.close() in the server code?

<p>To release the resource and close the client’s socket. (A)</p> Signup and view all the answers

What does the client do after connecting to the server?

<p>Prompts the user for a command to send to the server. (C)</p> Signup and view all the answers

What happens when l = connectionSocket.recv(1024) returns an empty byte string?

<p>The loop responsible for reading data terminates. (C)</p> Signup and view all the answers

What is the first step in the file-sending process of the server?

<p>Decode the client's file name request. (B)</p> Signup and view all the answers

Which backend library is used in the provided code for networking features?

<p>socket (D)</p> Signup and view all the answers

What is the significance of f.write(l) in the server code?

<p>It saves the data received from the client to the opened file. (C)</p> Signup and view all the answers

What will happen if the user enters a file name that does not exist in the client code?

<p>An error will be raised, and the connection will terminate. (A)</p> Signup and view all the answers

What does UDP provide in terms of data transfer between client and server processes?

<p>Unreliable transfer of datagrams (C)</p> Signup and view all the answers

Which of the following steps does a UDP server perform to bind to a port?

<p>Bind socket to the server's local IP and port (B)</p> Signup and view all the answers

In TCP programming, what is the purpose of the accept() method?

<p>To create a new socket for a specific client connection (C)</p> Signup and view all the answers

What happens when a UDP client sends a datagram to a server?

<p>The sender includes the destination IP and port in the datagram (D)</p> Signup and view all the answers

What is a major feature of TCP that distinguishes it from UDP?

<p>Reliable and in-order byte-stream transfer (D)</p> Signup and view all the answers

When creating a Python UDP socket, which command is incorrect for setting up?

<p>serverSocket.listen(3) (B)</p> Signup and view all the answers

What command does a TCP client issue to establish a connection with the server?

<p>connect() (C)</p> Signup and view all the answers

In the context of sending files via TCP, what command does the client use to request a file?

<p>GET (A)</p> Signup and view all the answers

Which of the following statements about the UDP protocol is true?

<p>Packets may arrive out of order. (D)</p> Signup and view all the answers

What happens if a server running a TCP application is busy?

<p>Only a fixed number of connections will be accepted. (A)</p> Signup and view all the answers

In a Python TCP server, which line of code is responsible for binding the socket to the server's address and port?

<p>serverSocket.bind(('', serverPort)) (B)</p> Signup and view all the answers

What is a key characteristic of a datagram in UDP?

<p>It is a self-contained packet of information. (D)</p> Signup and view all the answers

Which of the following describes a primary disadvantage of using UDP?

<p>Unreliable data transfer (B)</p> Signup and view all the answers

What is the role of the print() function in the Python UDPServer example?

<p>To display messages for debugging or information (C)</p> Signup and view all the answers

Flashcards

Socket

A virtual endpoint that acts as a communication channel between an application process and the underlying transport protocol (TCP or UDP).

UDP

A transport protocol known for its speed and unreliability. It uses datagrams, which are packets of data that are sent without guarantees of delivery or order.

TCP

A transport protocol designed for reliable communication. It guarantees delivery of data in the correct order and handles retransmissions and flow control.

Client-Server Application

An application model where a client process requests services from a server process. The client initiates communication and the server responds.

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Data Transmission in Client-Server

In a client-server application, client sends data to the server, the server processes the data, and then sends the processed data back to the client.

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UDP Socket Programming

A type of communication that sends data packets without establishing a connection beforehand. This makes it fast but unreliable, as packets might be lost or arrive out of order.

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UDP Datagram

A group of bytes containing data that is sent over a UDP socket. It's like a single letter sent over a postal system.

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UDP Socket Creation

The process of creating a UDP socket on both the client and server side. Each socket is assigned a unique port number.

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UDP Sending Data

The client explicitly attaches the server's IP address and port number to each UDP datagram before sending it.

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UDP Receiving Data

The server can extract the sender's IP address and port number from the received UDP datagram.

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TCP Socket Programming

A type of communication that establishes a reliable connection between the client and server. It guarantees that data will be delivered in order and without loss.

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TCP Socket Creation

Creating a TCP socket on both the client and server side. The server socket typically listens for incoming connections.

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TCP Connecting

The client establishes a connection to the server by creating a TCP socket and specifying the server's IP address and port number. The server then accepts the connection.

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TCP Sending Data

The client sends data through the established TCP connection, and the server reads that data.

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TCP File Transfer Protocol

A protocol used for sending and receiving files over a TCP connection. It involves commands such as GET (download) and SEND (upload).

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TCP Server Listening

The TCP server waits for incoming connection requests from clients. It can handle multiple clients simultaneously.

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TCP Accept Connection

The server accepts a new client connection, creating a new socket to communicate with that specific client.

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TCP Close Connection

The client or server can close the TCP connection, ending the communication session.

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TCP Server Socket

The server socket is created first on a specific port number, and it listens for incoming connection requests from clients.

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TCP Client Socket

The client socket is created when a client wants to connect to a server. It's used to establish the connection and send/receive data.

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What is the purpose of the connectionSocket.recv(1024) function?

The connectionSocket.recv(1024) function receives data from the connected socket. In this context, it reads the filename sent by the client.

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What is the significance of f.read(1024) used in the server code?

This line reads 1024 bytes (1KB) of data from the file at a time. It serves as a buffer, efficiently sending file data to the client in manageable chunks.

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Explain the server's process for sending a file to the client.

The server receives the filename from the client, opens the file, reads it in 1KB chunks, and sends each chunk to the client until all data is transmitted.

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What is the role of the while(l) loop in the server's file sending process?

The loop ensures all file data is transferred. It reads data as long as there's data available in the file (indicated by the l variable).

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Describe the client's 'SEND' command to the server.

The client sends the 'SEND' command to the server, indicating that it intends to transmit a file to the server.

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How does the server handle the client's SEND command?

Upon receiving the SEND command, the server opens a file named 'from_client' in write mode and prepares to receive the client's file data.

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Explain the role of connectionSocket.send(sentence.encode('utf-8')) in the client code.

This code sends the user-entered command (like 'GET' or 'SEND') to the server. By encoding the string to utf-8, it ensures proper transmission of text data.

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What is the purpose of the loop while True: in the client code?

The loop keeps the client running continuously, allowing it to send multiple requests ('GET' or 'SEND') to the server without having to restart the connection.

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Why does the client send the filename to the server after sending the 'GET' or 'SEND' command?

The server requires the filename to identify and locate the requested file on its end. Providing the filename allows precise file retrieval.

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Explain the difference between the client and server's roles in this network communication.

The client sends requests to the server (like 'GET' or 'SEND') and provides filenames. The server fulfills the requests, sending requested files or receiving uploaded files from the client.

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Study Notes

Network Programming: Socket Programming

  • Network programming involves creating client/server applications that communicate over computer networks, primarily using sockets.
  • A socket acts as a connection point between application processes and the underlying network protocols.
  • This process is controlled by the operating system (OS).

Application Layer: Overview

  • Network applications have principles of operation to consider.
  • Socket programming uses different transport services, like UDP and TCP.
  • Socket programming can be single-threaded or multi-threaded
  • Web and HTTP protocols play a role in application communication.
  • The Domain Name System (DNS) translates domain names to IP addresses.

Socket Programming with UDP

  • UDP is a connectionless protocol, no connection established between client and server before sending data.
  • Data packets are sent independently, without guarantees of delivery order or arrival.
  • Packets may be lost or arrive out-of-order.
  • Suitable for applications where speed is crucial, over reliability.
  • Applications using UDP can transfer groups of bytes reliably.

Socket Programming with TCP

  • TCP is a connection-oriented protocol, requiring a connection between client and server before transmitting substantial data.
  • Data is transmitted in a controlled stream and reliably.
  • Data is delivered in order and guarantees delivery.
  • It is appropriate for situations requiring data integrity and order preservation.
  • Applications using TCP can reliably transfer data in a byte-stream.

Client/Server Socket Interaction: UDP

  • A client initiates a communication by first creating a socket.
  • The client sends a datagram to the server, specifying the server's IP address and port.
  • The server receives the datagram from the client, extracts relevant data, and sends a server reply.
  • The server specifies the client address and port while sending the reply.
  • The client closes the socket after receiving its response.

Client/Server Socket Interaction: TCP

  • A client initiates a connection by first creating a socket.
  • A connection is required before transmitting data between the processes.
  • A request from the client is handled by the server.
  • A reply from the server is returned to the client.
  • The connection closes, and this procedure is repeated as needed.

Example Applications (Python)

  • Python code examples are available for creating and using UDP- and TCP-based client and server programs.
  • Detailed examples showcase usage of socket libraries to send and receive data.

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Network Programming: Socket Programming PDF

Description

This quiz covers the fundamentals of socket programming in network applications, including the concepts of client/server communication and the roles of TCP and UDP protocols. It highlights the principles of socket functionality and the importance of the Domain Name System (DNS). Test your understanding of these critical networking concepts!

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