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Which of the following ports should be opened?

A security technician needs to open ports on a firewall to allow for domain name resolution.
Which of the following ports should be opened? (Choose two.)

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A.
TCP 21

B.
TCP 23

C.
TCP 53

D.
UDP 23

E.
UDP 53

Explanation:
DNS uses TCP and UDP port 53. TCP port 53 is used for zone transfers, whereas UDP port 53 is used for
queries.

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