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Physical layer
The first layer of the OSI model. Provides the hardware means of transmitting electrical
signals on a data carrier
Ping
A utility program that verifies that a given Internet address exists and can receive
messages. The utility sends a control packet to the given address and waits for a
response.
PoE
Power over Ethernet is the means of transmitting electricity over the unused pairs in a
category 5 Ethernet cable
POP3
Post Office Protocol 3 is used for receiving email
Port
A logical channel endpoint in a network. A computer might have only one physical
channel (its Ethernet channel) but can have multiple ports (logical channels) each
identified by a number.
PPP
Point-to-Point Protocol is used for two computers to communicate with each over a serial
interface, like a phone line
PPPoE
Point-to-Point Protocol over Ethernet is used to connect multiple computers to a remote
server over Ethernet
PPTP
Point-to-Point Tunneling Protocol is used for creating VPN tunnels over the Internet
between two networks
Preamble
Used to synchronize communication timing between devices on a network
Q
QoS
Quality of Service
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R
RADIUS
Remote Authentication Dial-In User Service allows for remote users to dial into a central
server and be authenticated in order to access resources on a network
Reboot
To restart a computer and reload it's operating software or firmware from nonvolatile
storage.
Rendezvous
Apple's version of UPnP, which allows for devices on a network to discover each other
and be connected without the need to configure any settings
Repeater
Retransmits the signal of an Access Point in order to extend it's coverage
RIP
Routing Information Protocol is used to synchronize the routing table of all the routers on
a network
RJ-11
The most commonly used connection method for telephones
RJ-45
The most commonly used connection method for Ethernet
RS-232C
The interface for serial communication between computers and other related devices
RSA
Algorithm used for encryption and authentication
S
Server
A computer on a network that provides services and resources to other computers on the
network
Session key
An encryption and decryption key that is generated for every communication session
between two computers
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Session layer
The fifth layer of the OSI model which coordinates the connection and communication
between applications on both ends
Simple Mail Transfer Protocol
Used for sending and receiving email
Simple Network Management Protocol
Governs the management and monitoring of network devices
SIP
Session Initiation Protocol. A standard protocol for initiating a user session that involves
multimedia content, such as voice or chat.
SMTP
Simple Mail Transfer Protocol
SNMP
Simple Network Management Protocol
SOHO
Small Office/Home Office
SPI
Stateful Packet Inspection
SSH
Secure Shell is a command line interface that allows for secure connections to remote
computers
SSID
Service Set Identifier is a name for a wireless network
Stateful inspection
A feature of a firewall that monitors outgoing and incoming traffic to make sure that only
valid responses to outgoing requests are allowed to pass though the firewall
Subnet mask
Determines what portion of an IP address designates the Network and which part
designates the Host
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Syslog
System Logger -- a distributed logging interface for collecting in one place the logs from
different sources. Originally written for UNIX, it is now available for other operating
systems, including Windows.
T
TCP
Transmission Control Protocol
TCP Raw
A TCP/IP protocol for transmitting streams of printer data.
TCP/IP
Transmission Control Protocol/Internet Protocol
TFTP
Trivial File Transfer Protocol is a utility used for transferring files that is simpler to use
than FTP but with less features
Throughput
The amount of data that can be transferred in a given time period
Traceroute
A utility displays the routes between you computer and specific destination
U
UDP
User Datagram Protocol
Unicast
Communication between a single sender and receiver
Universal Plug and Play
A standard that allows network devices to discover each other and configure themselves
to be a part of the network
Upgrade
To install a more recent version of a software or firmware product
Upload
To send a request from one computer to another and have a file transmitted from the
requesting computer to the other
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UPnP
Universal Plug and Play
URL
Uniform Resource Locator is a unique address for files accessible on the Internet
USB
Universal Serial Bus
UTP
Unshielded Twisted Pair
V
Virtual Private Network
VPN: A secure tunnel over the Internet to connect remote offices or users to their
company's network
VLAN
Virtual LAN
Voice over IP
Sending voice information over the Internet as opposed to the PSTN
VoIP
Voice over IP
W
Wake on LAN
Allows you to power up a computer though it's Network Interface Card
WAN
Wide Area Network
WCN
Windows Connect Now. A Microsoft method for configuring and bootstrapping wireless
networking hardware (access points) and wireless clients, including PCs and other
devices.
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