Xblue Networks X-50 - Manual (Page 247)

XBLUE Networks 247
Glossary of Terms
13
NPT – Network Time Protocol – A protocol that defines the ability to synchronize different computer systems over
a packet switched network, using UDP packets via port 123 as the transport layer.
P2P – Peer to Peer – All computers have the ability share information with each other without logging into a server.
This protocol is very helpful with VoIP.
PPPoE – Point-to-Point Protocol over Ethernet – This transport protocol is used on telephone networks as
“ATM”, where the DSL modem encapsulates PPP packets inside ATM cells and send them over a WAN Connection.
PAP – Password Authentication Protocol – This requires the requesting device to send an un-encrypted authen-
tication, which must contain both the ID and password, to the local router when attempting to connect.
TABLE 13.1 Some Network Time Protocol
Network Time Protocol
time-a.nist.gov
129.6.15.28
NIST, Gaithersburg, Maryland time.nist.gov
192.43.244.18
NCAR, Boulder, Colorado
time-b.nist.gov
129.6.15.29
NIST, Gaithersburg, Maryland nist1.dc.certifiedtime.com
216.200.93.8
Abovnet, North Virginia
time-a.timefreq.bldrdoc.gov
132.163.4.101
NIST, Boulder, Colorado nist1.dc.certifiedtime.com
216.200.93.8
Abovnet, North Virginia
time-b.timefreq.bldrdoc.gov
132.163.4.102
NIST, Boulder, Colorado nist1.dc.certifiedtime.com
216.200.93.8
Abovnet, North Virginia
time-c.timefreq.bldrdoc.gov
132.163.4.103
NIST, Boulder, Colorado nist1.nyc.certifiedtime.com
208.184.49.129
Abovnet, New York City
utcnist.colorado.edu
128.138.140.44
University of Colorado, Boulder nist1.sjc.certifiedtime.com
207.126.103.202
Abovnet, San Jose, California