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PDA - Personal Digital Assistant
A handheld device used for organization, notes, address books, etc.
POP - Post Office Protocol
An Internet protocol for retrieving email from a remote server over a TCP/IP connection.
Port.
A virtual data connection used by programs to exchange data. It is the endpoint in
a logical connection. The port is specified by the port number.
Port Forwarding
A process that allows remote devices to connect to a specific computer within a private
LAN.
Port Number
A 16-bit number used by the TCP and UDP protocols to direct traffic on a
TCP/IP host. Certain port numbers are standard for common applications.
Private IP Address
Private IP addresses are also LAN IP addresses, but are considered “illegal” IP addresses
to the Internet. They are private to an enterprise while still permitting full network layer
connectivity between all hosts inside an enterprise as well as all public hosts of different
enterprises.
The Router uses private IP addresses by assigning them to the LAN that cannot be
directly accessed by the Internet or remote server. To access the Internet, private
network should have an agent to translate the private IP address to public IP address.
Protocol
A standard that enables connection, communication, and data transfer between
computing endpoints.
PPP - Point to Point Protocol
A method of connecting a computer to the Internet.
PPTP - Point-to-point Tunnelling Protocol
A method for implementing virtual private networks that does not provide confidentiality
or encryption but relies on the tunnelling process for security.
PRL - Preferred Roaming List
A list that your wireless phone or device uses to determine which networks to connect
with when you are roaming. (Network operator specific)
Protocol
A standard that enables connection, communication, and data transfer between
computing endpoints.
Proxy
A firewall mechanism that replaces the IP address of a host on the internal
(protected) network with its own IP address for all traffic passing through it.
Public IP Address
Public IP addresses are LAN IP addresses that can be considered “legal” for the Internet,
because they can be recognized and accessed by any device on the other side of the DSL
connection. In most cases they are allocated by your ISP.
If you are given a range of fixed IP addresses, then one can be assigned to the router
and the others to network devices on the LAN, such as computer workstations, ftp
servers, and web servers.
PVC - Permanent Virtual Circuit
A PVC is a logical point-to-point circuit between customer sites. PVC’s are low-delay
circuits because routing decisions do not need to be made along the way. Permanent
means that the circuit is pre-programmed by the carrier as a path through the network.
It does not need to be set up or turned down for each session.
RIP - Routing Information Protocol
RIP is a routing protocol that uses the distance-vector routing algorithms to calculate
least-hops routes to a destination. It is used on the Internet and is common in the
NetWare environment. It exchanges routing information with other routers. It includes
V1, V2 and V1&V2, which controls the sending and receiving of RIP packets over
Ethernet.
RFB - Remote Frame Buffer
A protocol for remote access to graphical user interfaces.
Router
A device that directs traffic from one network to another.
