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DNS listens on which well-known ports?

  • TCP port 53 and UDP port 53
  • UDP port 67 and UDP port 68
  • TCP port 21 and TCP port 22
  • TCP 161 and UDP 161
Explanation & Hint:

DNS (Domain Name System) listens on TCP port 53 and UDP port 53. These are the well-known ports used for DNS operations. DNS uses UDP for most of its query-response purposes, and TCP is typically used for zone transfers and for queries that require reliable delivery.

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Threat Analysis Post-Assessment | CBROPS