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单选题 How many RTTs are there from when a client first contacts an email server (by initiating a TCP session) to when the client can begin sending the email message itself – that is following all initial TCP or SMTP handshaking required? Recall the figure below from our class notes: 
学科：计算机网络-自顶向下
时间：2024-01-18 02:53:10
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题目1单选题
How many RTTs are there from when a client first contacts an email server (by initiating a TCP session) to when the client can begin sending the email message itself – that is following all initial TCP or SMTP handshaking required? Recall the figure below from our class notes: <img src="https://tihai-oss-cloud.itihey.com/img/c7c883fe109815c32bbc2712a673ea27.png">A. 2.5B. 3.5C. 2D. 3
题目2多选题
Which of the following characteristics apply to HTTP only (and do not apply to SMTP)? Note: check one or more of the characteristics belowA. Is able to use a persistent TCP connection to transfer multiple objectsB. Operates mostly as a "client pull" protocolC. Uses server port 25D. Uses server port 80E. Uses a blank line (CRLF) to indicate end of request headerF. Has ASCII command/response interaction, status codesG. Operates mostly as a "client push" protocolH. Uses CRLF.CRLF to indicate end of message
题目3填空题
HTTP response status codes ( ) OK request succeeded, requested object later in this msg题目4填空题
FTP commands, responses: RETR filename ( ) (gets) file题目5填空题
RTT: Round-( ) Time: 往返时间题目6填空题
mail server port numbers( )题目7填空题
TCP service provide ( ) control、congestion control题目8填空题
Match the functionality of a protocol with the name of a the email protocol (if any) that implements that functionality. Pushes email from a mail client to a mail server. Pulls mail from one mail server to another mail server. Pulls email to a mail client from a mail server. ANSWER LIST: IMAP SMTP Neither SMTP nor IMAP does this题目9填空题
IMAP: Internet ( ) Protocol题目10填空题
SSL- Security ( ) Layer 加密套接字协议层下载 题海APP
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