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?

Transport network Signup and view all the answers

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

Reliable and unreliable Signup and view all the answers

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

Opens a file named 'from_client' for writing. Signup and view all the answers

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

Using a loop that reads 1 K byte each time. Signup and view all the answers

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

To release the resource and close the client’s socket. Signup and view all the answers

What does the client do after connecting to the server?

Prompts the user for a command to send to the server. Signup and view all the answers

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

The loop responsible for reading data terminates. Signup and view all the answers

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

Decode the client's file name request. Signup and view all the answers

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

socket Signup and view all the answers

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

It saves the data received from the client to the opened file. Signup and view all the answers

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

An error will be raised, and the connection will terminate. Signup and view all the answers

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

Unreliable transfer of datagrams Signup and view all the answers

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

Bind socket to the server's local IP and port Signup and view all the answers

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

To create a new socket for a specific client connection Signup and view all the answers

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

The sender includes the destination IP and port in the datagram Signup and view all the answers

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

Reliable and in-order byte-stream transfer Signup and view all the answers

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

serverSocket.listen(3) Signup and view all the answers

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

connect() Signup and view all the answers

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

GET Signup and view all the answers

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

Packets may arrive out of order. Signup and view all the answers

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

Only a fixed number of connections will be accepted. 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?

serverSocket.bind(('', serverPort)) Signup and view all the answers

What is a key characteristic of a datagram in UDP?

It is a self-contained packet of information. Signup and view all the answers

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

Unreliable data transfer Signup and view all the answers

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

To display messages for debugging or information Signup and view all the answers

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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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!