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3. How do DNS servers resolve a domain name into anIP address?

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4. How do DNS servers resolve an IP address into adomain name?

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

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.)