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Exam 210-250 topic 1 question 142 discussion

Actual exam question from Cisco's 210-250
Question #: 142
Topic #: 1
[All 210-250 Questions]

Which one of the following options describes the protocol and port that is used by DNS?

  • A. TCP 53
  • B. UDP 53
  • C. UDP 53 and TCP 53
  • D. any registered port
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Suggested Answer: C 🗳️
by RedByte at Dec. 24, 2019, 12:39 p.m.

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RedByte
5 years, 4 months ago
Again, thanks for your contribution answer D.
upvoted 1 times
XalaGyan
5 years, 1 month ago
Any Port ? actually not correct. DNS runs primarily on UDP due to speed and protocol overhead, but can be run as TCP as well. Port 53 is well-known for DNS whether TCP or UDP.
upvoted 3 times
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