NTP vs. SNTP

crabeatercrabeater Posts: 88Member ■■□□□□□□□□
Would someone please tell me which the exam wants? Or maybe better put, which is common/normally used.

In two NET+ sources, I am told network time service is UDP port 37.
TechNotes says port 123 for NTP.

On some web pages, I have found them saying there are 2 protocols:
SNTP - Simple Network Time Protocol, port 37
NTP - Network Time Protocol, port 123

Clearly BOTH are valid !!!
Is SNTP mainly for UNIX servers?

What is the difference?

THANKS
NEVER MIND -- found more info today
http://www.boulder.nist.gov/timefreq/service/its.htm
Both are valid, but SNTP is all but gone
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