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5. What resource records are used in orward-DNS andreverse-DNS, respectively?

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6. What entities and protocols are involved i you sendan e-mail or your riend to read?

7. POP3 vs. IMAP4? (Compare their number ocommands, f exibility, and usage.)

8. What POP3 messages are exchanged when youdownload mail rom the server?

9. What HTTP messages are exchanged in download-ing,  lling, and uploading a Web orm?