1.2 Suppose Alice, with a Web-based email account (such as Hotmail or Gmail), sends a message to Bob, who accesses his mail from his mail server using POP3. Discuss how the message gets from Alice's host to Bob's host. Be sure to list the series of application-layer protocols that are used to move the message between the two hosts.
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A: Alice-> HTTP ->Web-based mail server-> SMTP-> Mail server for Bob ->POP3 ->Bob.
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A: Answer is given below-
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A: The above question is solved in step 2 :-
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- Write C# code for sending an email using SMTPMail class to server with IP address 192.0.0.1 with following details: To : networkprogramming@np.com From: student@np.com Subject : Final Exam Body: Mail body textQ2.Recently QUIC protocol is suggested. a. Elaborate on the advantages of QUIC through an example scenario. b. The standard protocols, like TCP, UDP and HTTP, are implemented in various languages. For example, Java language has ServerSocket() class for TCP server. Does the QUIC protocol is supported in any language? I mean its library is available. If yes, please explain its working. And run a simple QUIC client program, even if this program is available over the Internet. c. List the servers supporting QUIC protocol, if they exist.Answer the Qusetion: “The Java URL class represents an URL. URL is an acronym for Uniform Resource Locator.It points to a resource on the World Wide Web”With reference to the above context, please answer the following:a) Write the full java program to get the protocol name, host name and port name of any URL of your choice for example:“https://www.tutorialspoint.com/java/java_applet_basics.htm " b) Explain the different constructors in java.net.URL package using the code snippets. c) Discuss the exception thrown when creating a URL for an unknown protocol. d) Write a code in Java to find the InetAddress of a machine , InetAddress of host of any URL of your choice for example: “www.tutorialspoint.com” website. Give any two methods.
- Description: You are required to implement a server program that responds to both TCP and UDP requests from the corresponding clients. The service provided by the server is simply a substitute cipher/cryptosystem. The cipher replaces one character to another based on some key. The input message (plaintext) can be of any size but composed only of small-letter (abcdefghijklmnopqrstuvwxyz). The output (ciphertext) has the same size and composed also of small-letter characters. The key is limited to 7 characters (also small-letter). You need to treat each digit as a number according to its position in the alphabet. For example, a=0, b=1, …,z=26. To encrypt a message, you add a plaintext character with the corresponding key character (mod 26). The key might be repeated to match the length of the plaintext message. In the decryption, you subtract the corresponding key character from the ciphertext character (mod 26). Again the key might be repeated as necessary. For example, if the…Hello, the code task below has to be written in python 3 and the HTTP must show the html file from the command line. Please help. Also below is the skeleton python below which needs to be in python 3 Currently, the web server handles only one HTTP request at a time. Implement a multithreaded server that is capable of serving multiple requests simultaneously. Using threading, first create a main thread in which your modified server listens for clients at a fixed port. When it receives a TCP connection request from a client, it will set up the TCP connection through another port and services the client request in a separate thread. There will be a separate TCP connection in a separate thread for each request/response pair. Skeleton Python Code for the Web Server #import socket modulefrom socket import *import sys # In order to terminate the programserverSocket = socket(AF_INET, SOCK_STREAM)#Prepare a sever socket#Fill in start#Fill in endwhile True: #Establish the…I need a help with my python activity. This requires 2 clients and 1 server. This is a system to support an online math contest. Rule: There are two participants answering at the same time. The host is responsible in starting up the server, after that they wait for the clients. When the two clients are connected, they must send the message: READY to the server. When the server receives the two READY from the clients, the contest starts. The server will display 3 questions one after another which can be answered in 30 secs each. 11+10 = 21 10+22 = 32 10+10 = 20 The participant with most correct answers wins. At the end of the program, the server must show the results. ex: Client1 WINS! 2/3 Client2: 1/3
- write a client-server program in C: Copy the program, compile and run(to ensure it is functional). Hint: IP address 0.0.0.0 and 127.0.0.1 (Loopback IP address); Insert appropriate comments in your example program to highlight the following aspects of the API: Creating a socket Endpoint addresses (IP + Port number) used Client connecting to server Server accepting to connect to client Client communicating with (sending request to) server Server accepting client request Server processing client request Server communicating with (sending reply back to) client Client receiving server’s response Client closing the connection Server closing a connection.Currently, the web server handles only one HTTP request at a time. Implement a multithreaded server that is capable of serving multiple requests simultaneously. Using threading, first create a main thread in which your modified server listens for clients at a fixed port. When it receives a TCP connection request from a client, it will set up the TCP connection through another port and services the client request in a separate thread. There will be a separate TCP connection in a separate thread for each request/response pair.Hello. I need help to develop a C simulation program to simulate an 8-port Ethernet switch. The switch initially has no knowledge about the hosts connected to each port. It learns frame addresses and stores-and-forwards the frames. The input text file "in.txt" contains information of the incoming frames, one frame per line. There are 4 pieces of data per line: frame ID, arrival port, frame source address, and frame destination address. The frames arrive at the switch in the order of which they appear in the input file. Destination address "X" indicates a broadcast frame. The output text file"out.txt" has 8 lines. Each line lists all the frames departing from each port, here is an example:"in.txt" contains 5 incoming frames: F1 P2 B--AF2 P6 D--CF3 P5 E--BF4 P7 F--DF5 P6 D--X"out.txt" should list the departing frames on each port:P1: F1 F2 F5P2: F2 F3 F5P3: F1 F2 F5P4: F1 F2 F5P5: F1 F2 F5P6: F1 F4P7: F1 F2 F5P8: F1 F2 F5 The contents of the in.txt file is found below. F1 P1 A--GF2…
- Hello, the code task below has to be written in python 3 and the HTTP must show the html file from the command line. Please help. Currently, the web server handles only one HTTP request at a time. Implement a multithreaded server that is capable of serving multiple requests simultaneously. Using threading, first create a main thread in which your modified server listens for clients at a fixed port. When it receives a TCP connection request from a client, it will set up the TCP connection through another port and services the client request in a separate thread. There will be a separate TCP connection in a separate thread for each request/response pair.1. Part A: • Develop a TCP server program in java that waits for clients to connect. • The server responds to the client with one of the following based on client’s request: *Export public key generated using KeyPairGenerator *Export Message Digest * Export Digital Signature * Send original text for the encrypted text received from clientIn this assignment, you will develop a simple Web server in Python that is capable of processing only one request. Specifically, your Web server will (i) Create a connection socket when contacted by a client (browser) (ii) Receive the HTTP request from this connection(iii) Parse the request to determine the specific file being requested(iv) Get the requested file from the server’s file system(v) Create an HTTP response message consisting of the requested file preceded by header lines(vi) Send the response over the TCP connection to the requesting browser. If a browser requests a file that is not present in your server, your server should return a “404 Not Found” error message. Your job is to code the steps above, run your server, and then test your server by sending requests from browsers running on different hosts. If you run your server on a host that already has a Web server running on it, then you should use a different port than port 80 for your Web server. Make sure to test your…