题目内容

1. Why are protocol messages o most Internet applica-tions ASCII and variable length?

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

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?