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- A client application connects to a server and sends an operation, and gets a result back. What happens then? Is the connection open, so that the client can send more operations? Answer the question comparing the protocols SMTP, FTP, HTTP, POP and IMAP. What are the pros and cons of keeping the connection open or closing it down after each operation?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 client8.4 One of the non-payload options in Snort is flow. This option distinguishes between clientsand servers. This option can be used to specify a match only for packets flowing in one direction(client to server or vice-versa) and can specify a match only on established TCP connections.Consider the following Snort rule:alert tcp $EXTERNAL_NET any -> $SQL_SERVERS $ORACLE_PORTS\ (msg: “ORACLE drop tableattempt:;\ flow: to_server, established; content: “drop table_name”; nocase;\classtype: protocol-command-decode;)a. What does this rule do?b. Comment on the significance of this rule if the Snort devices is placed inside or outside of theexternal firewall.
- In Client-server paradigm, the clients need dynamic IP to communicate with each other. True FalseA client application establishes a connection to a server, transmits an action, and waits for a response. What happens then? Is the connection still accessible for other operations? Compare the protocols SMTP, FTP, HTTP, POP3, and IMAP. What are the advantages and disadvantages of maintaining or terminating the connection between operations?The Message structure and partial “server” code -using IPC mechanism message queue- seen below.a. Write needed code for creating message queueb. Write needed code for deleting message queuec. Write the corresponding partial “client” code for this partial server.Message Structure:typedef struct {long int msg_to; // Message in queue for this typelong int msg_fm; // Placed in the queue by this typechar buffer[BUFSIZ]; // The actual message}MESSAGE;Partial Server Code:1. while (1) {2. memset( msg.buffer, 0x0, BUFSIZ );3. if ((n=msgrcv(mid, &msg, BUFSIZ, SERVER, 0)) == -1 ) {4. perror("Server: msgrcv");5. return 2;6. } else if (n == 0) break;7. process_msg(msg.buffer, strlen(msg.buffer));8. msg.msg_to = msg.msg_fm;9. msg.msg_fm = SERVER;10. n += sizeof(msg.msg_fm);11. if (msgsnd(mid, &msg, n, 0) == -1 ) {12. perror("Server: msgsnd");13. return 3;14. }15. }
- q36- What a mechanism is used by TCP to provide flow control as segments travel from source to destination? Select one: A. Window size B. Acknowledgments C. Session establishment D. Sequence numbersI NEED ONLY CORRECT OPTION NO NEED TO EXPLAIN IN DEPTH,PLEASE SOLVE ALL THE QUESTION, DON'T LEAVE ANY QUESTION AND IF YOU DON'T KNOW THE CORRECT ANSWER THEN PLEASE LEAVE IT OTHERWISE I WILL DOWNVOTE IT.... 1. Which of the following statements are correct?I. The User Datagram Protocol (UDP) is used for applications that requires constantdata flow.Il.The header size in Transmission Control Protocol (TCP is small when compared tothe header size of User Datagram Protocol (UDP).I!.The Transmission Control Protocol (TCP) is byte oriented.IV. The User Datagram Protocol (UDP) is used for routing.(a) I, II, and III only(b) II, Ill, and IV only(c) I, Ill, and IV only(d) I, Il, and IV only 2. Which of the following statements are true when the block size in a fixed block size filesystem is increased?1. disk throughput is increased2. disk throughput is decreased3. disk space utilization is increased4. disk space utilization is decreased 3. What is the output of below…Find the class of the following two IP addresses (both are classful addresses),as well as their netid and hostid: a. 104.37.3.6 b. 208.34.54.12
- Assume that Computer A, which is connected through an Ethernet cable to the Switch S1, is just powered on. The user opens a browser and then types a website address to receive the website from the Server (as shown in Figure 1). Write down all the important protocols that come into play by the time the first frame containing HTTP request reaches R1. (Note: Before HTTP frame, other frames have already been sent by other protocol(s).) Write down all the protocols with reference to the TCP Model as follows? Application Layer: Transport Layer: Internet Layer: Link Layer:Tasks: Part A: Develop a UDP/IP server program in java that waits for clients to server. The server responds to the client with one of the following based on client’s request: Export secret key generated using KeyGenerator Export Text and Message Digest Export Text and Digital Signature Send original text for the encrypted text received from client Part B: Develop a UDP/IP client program that make request secret key, Message Digest, Digital Signature and original text by sending the encrypted text to server program developed (in Part A). This program will display the various objects received from server on its console.In 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…