Last Updated on November 21, 2023 by InfraExam
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. |