List the Server-Client dialog to show the sequence of SMTP messages for sending an email from salam@uobaghdad.edu.iq to Ahmed@who.org. You can use the table shown in fig to choose the suitable commands and responses. The body of email to be transmitted contains the following message: Hello Ahmed, Call me please Best regards, Commands (Client MTA → Server MTA) HELO Mailserver-name MAIL FROM: Descriptions Responses (Server MTA A→Client MTA) Descriptions Sends DNS name of the client mail server 220 Recipient server is ready e-mail address of sender 221 RCPT TO: DATA e-mail address of recipient 250 Request to send the message 354 ING QUIT Requests recipient server to close TCP conn 421 RSET Abort current mail transfer 450 Recipient server is closing TCP connection Command carried out successfully Indicates the recipient server is ready to receive Service request declined Mailbox unavailable

Question 23 A client's browser sends an HTTP request to a website. The website responds with a handshake and sets up a TCP connection. The connection setup takes 2.1 ms, including the RTT. The browser then sends the request for the website's index file. The index file references 8 additional images, which are to be requested/downloaded by the client's browser. Assuming all other conditions are equal, how much longer would non-persistent HTTP take than persistent HTTP? (Give answer in milliseconds, without units, rounded to one decimal place. For an answer of 0.01005 seconds, you would enter "10.1" without the quotes.)

Can you recommend the best HTTP version for my use case? Explain the function of each status code used in HTTP 2.0 response messages.

write a  Node/Express web server that supports routing via endpoint /cookie. Declare a variable named a and initialize it to 10 seconds.In the callback of route /cookie:Check to see if the browser sends a cookie named startIf cookie start received by the server, increment value in variable a by 2 seconds.Creates and sends a cookie that expires after the number of seconds specified in the variable a.The cookie is to be named startwith assigned value of 450.Import package cookie-parser for cookie handling

How often will proper and thorough responses be provided? It has been downvoted if it lacks a concise explanation of HTTP's primary properties.

The following message arrived protected by the following CRC polynomial. Does the message have an error or not? Why?   In the below table, show your work that allowed you to make the determination of whether an error exists in the message or not. Add rows and columns to the below table as necessary. M(x): 11010011100011  CRC-3-GSM:  x3 + x + 1 CRC that was in the message: 011     X0       T(x)         C(x)         Remainder

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