Network

5. From a user's perspective, what is the difference between the download-and-delete mode and the download-and-keep mode in POP3? (10 pts) 6. Is it possible that an organization's Web server and mail server have exactly the same alias for a hostname (e.g., kdd.com)? What would be the type for the RR that contains the hostname of the mail server? (10 pts) 7. Fill in the table based on the following HTTP GET message captured by Wireshark: (25 pts) GET /cs453/index.html HTTP/1.1Host: gai a.cs.umass.eduUser-Agent: Mozilla/5.0 ( Windows;U; Windows NT 5.1; en-US; rv:1.7.2) Gec ko/20040804 Netscape/7.2 (ax) Accept:ex t/xml, application/xml, application/xhtml+xml, text /html;q=0.9, text/plain;q=0.8, image/png,*/*;q=0.5 Accept-Language: en-us, en;q=0.5Accept- Encoding: zip,deflateAccept-charset: ISO -8859-1, utf-8;q=0.7,*;q=0.7Keep-Alive: 300 Connection: keep-alive Answer Question URL of the document requested by the browser: HTTP version: non-persistent or persistent connection: Browser type: The purpose of the browser type in an HTTP request message