Section 5
Glossary
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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 InterNet
Groper.”
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 device on a LAN.
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 by the service provider.
A public IP address is visible to devices on the Internet. See also
Private IP Address
.
