CISSP: UDP port 123. Since the Network Time Protocol is a connectionless protocol, it uses the User Datagram Protocol (UDP), on port 123.

Question

UDP port 123. Since the Network Time Protocol is a connectionless protocol, it uses the User Datagram Protocol (UDP), on port 123.

John Intindolo · Accepted Answer

What transport layer protocol and port does the Network Time Protocol (NTP) use?
- TCP port 123
- UDP port 123
- TCP port 119
- UDP port 119

UDP port 123. Since the Network Time Protocol is a connectionless protocol, it uses the User Datagram Protocol (UDP), on port 123.