A group of bits that are combined for transmission in a
network. This term specifically refers to the header and data defined by OSI
layer 3 (network) layer protocols.
- PAP (Password
A component protocol of PPP, used to send usernames and
passwords as clear text.
- partial mesh
In Frame Relay, a network in which not all pairs of Frame
Relay-connected devices have a PVC between them.
A string of characters, kept private from other people, that is
used to prove that a user is who he claims to be.
- Password Authentication Protocol (PAP)
- See [PAP]
- patch cable
A short LAN cable used as one of several cables in a structured
wiring system. For example, the cable from a PC to a wall plate is a patch
- patch panel
A convenient place for an electrician to connect the wires in
cables that terminate in a wiring closet. The wires are connected to one side of
the panel. The panel provides an electrical pathway to other plugs, or
receptacles, much like the ones in the wall plate in a cubicle. The patch panel
allows an electrician, or network engineer, to use a short patch cable to
connect those pairs of wires to other devices.
- PC (personal
A computer that a singer user typically uses. It usually has
one keyboard, one display, and one mouse.
- permanent virtual circuit (PVC)
- See [PVC]
- personal computer (PC)
- See [PC]
- phone switch
- See [telco
- physical connectivity
Generic term referring to the combination of cabling,
networking devices, and network interface cards (NICs) in the computers, which
together provide the physical capability to transmit and receive data across a
- physical LAN
A broadcast domain created by a combination of computers,
cables, and networking devices.
- physical medium
A cable with either copper wires or optical fibers over which
electrical (copper) or light (fiber) energy can be passed. Binary data can be
transmitted over such media through encoding conventions that define what
particular electrical or light energy implies a binary 0 or
The physical position at the end of a connector where the
copper part of the wire sits.
- PIX Firewall
The name Cisco uses to brand its firewall product
- point of presence (POP)
- See [POP]
- point-to-point link
- See [WAN
- Point-to-Point Protocol (PPP)
- See [PPP]
- POP (point of
A building that houses equipment that an ISP
- POP3 (Post
Office Protocol, Version 3)
A TCP/IP protocol, defined in RFC 1939, that defines the
messages that control the transfer of e-mail. POP3 is typically used only by
clients, and only when retrieving e-mail from a POP3
- POP3 Server
Another term for POP3 Server
- POP3 Server Software
Software that implements the POP3 server
- Post Office Protocol, Version 3 (POP3)
- See [POP3]
- postal code
Generic term for what is called a zip code in the U.S.
- See also [zip
- PPP (Point-to-Point Protocol)
A data link layer protocol that is used on WAN
In Ethernet, a series of alternating binary 1s and 0s at the
beginning of a new frame.
- print server
A computer that performs print
- print services
The process by which one computer, typically called a print server, allows other computers to send it files
that are then printed on a printer that is physically attached to the print
In law enforcement, a characterization of how criminals
typically operate, so that law enforcement personnel can more easily catch the
- PSTN (Public
Switched Telephone Network)
A general term referring to the variety of telephone networks
and services in place worldwide. Sometimes called plain old telephone service
- public networking model
A networking model for which no one vendor dictates the
standards and protocols, with individuals from many companies and organizations
participating in the standards definition process.
- Public Switched Telephone Network (PSTN)
- See [PSTN]
FTP term meaning that the FTP client is moving a file from
itself to the serverin other words, it's putting the file on the
- PVC (permanent
A predefined Frame Relay VC. A PVC can be equated to a leased
line in concept.
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