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2. Why do servers running over TCP and UDP haveconcurrent and iterative implementations, respectively?

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

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?

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