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PCMCIA
The Personal Computer Memory Card International Association sets international standards for
connecting peripherals to portable computers. Laptop computers typically have a PCMCIA slot that can
hold one or two PC Cards to provide features such as Ethernet connectivity.
PING
A network utility that tests host reachability by sending a small packet to the host and waiting for a reply. If
you PING a computer IP address and receive a reply, you know the computer is reachable over the
network. It also stands for .Packet Inter-Net Groper.
POE
Power Over Ethernet is a technique used to supply low voltage operating power to devices connected
with a twisted pair Cat 5e Ethernet interface cable.
Port Triggering
A mechanism that allows incoming communication with specified applications.
PPP
Point-to-Point Protocol is used to transport other protocols, typically for simple links over serial lines. It is
most commonly used to access the Internet with a dial-up modem.
PPPoE
Point-to-Point Protocol over Ethernet. Used by many DSL Internet Service Providers for broadband
connection.
PPTP
Point-to-Point Tunneling Protocol encapsulates other protocols. It is a new technology to create VPNs
developed jointly by several vendors.
Private IP Address
An IP address assigned to a computer on a LAN by the DHCP server for a specified lease time. Private
IP addresses are invisible to devices on the Internet. See also Public IP Address.
Protocol
A formal set of rules and conventions for exchanging data. Different computer types (for example PC,
UNIX, or mainframe) can communicate if they support common protocols.
Public IP Address
The IP address assigned to the router or WAP by the service provider. A public IP address is visible to
devices on the Internet. See also Private IP Address.
R
RJ-11
The most common type of connector for household or office phones.
RJ-45
An 8-pin modular connector; the most common connector type for 10Base-T or 100Base-T Ethernet
networks.
Roaming
In wireless networking, roaming refers to the ability to move from one AP coverage area to another
without interruption in service or loss in connectivity.