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Question 449 - H12-711 discussion

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Which of the following descriptions about the DNS protocol is correct?

A.
There are four types of servers in the DNS domain name resolution system: root server, top-level domain name server, recursive server and cache server.
Answers
A.
There are four types of servers in the DNS domain name resolution system: root server, top-level domain name server, recursive server and cache server.
B.
The DNS protocol port number is 53
Answers
B.
The DNS protocol port number is 53
C.
DNS protocol transport layer can use either TCP or UDP
Answers
C.
DNS protocol transport layer can use either TCP or UDP
D.
If the DNS cache server does not have the domain name resolution cache to be queried, it will directly query the top-level domain name server
Answers
D.
If the DNS cache server does not have the domain name resolution cache to be queried, it will directly query the top-level domain name server
Suggested answer: A, B, D
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asked 18/09/2024
Peter Urban
42 questions
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