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