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Network Address Port Translation (NAPT)
NAPT is
a special case of
NAT, where internal IP
numbers are hidden
behind a single external addresses,
allowing you to
connect many local users
to the Internet with a single-user
ISP
account.
With NAPT, an almost
arbitrary
number of
connections is
multiplexed
using TCP port information
NTP
Network Time Protocol. A standard for synchronizing your system clock
with the true time, defined as the average of many high-accuracy clocks
around the world
Password Authentication Protocol (PAP)
A
basic form
of authentication, in
which a user’s name and
password are
transmitted over a
network
and compared to a
table of
name-password pairs
PBX
Short for Private Branch eXchange, a private telephone network used within
an enterprise. Users of the PBX share a certain number of outside lines for
making telephone calls external to the PBX
Ping
A utility used to determine whether a specific IP address is accessible. It
works by sending a packet to the specified address and waiting for a reply
POP3
Post Office Protocol 3. A protocol that provides a simple, standardized way
for users to access mailboxes and download messages to their computers
POTS
Short for Plain Old Telephone Service, which refers to the standard
telephone service that most homes use. In contrast, telephone services based
on high-speed, digital communications lines, such as ISDN and FDDI, are
not POTS. The main distinctions between POTS and non-POTS services
are speed and bandwidth. POTS is generally restricted to about 52 Kbps
(52,000 bits per second).
Point-to-Point Protocol over Ethernet (PPPoE)
A protocol for connecting
remote
hosts
to the
Internet over
an always-on
connection by simulating a
dial-up connection
PSTN