Explanation of Terms
2476_en_I
PHOENIX CONTACT
B-9
Port
A 16-bit number (1-65535) used by TCP and UDP for application (services) identification on
a given computer. More than one application can be run at a host simultaneously
(e.g., internet server, mail client, FTP client, etc.). Each application is identified by a port
number. In other words, it is the identifier for a logical connector between an application
entity and the transport service.
PPPoE (Point-to-Point
Protocol over Ethernet)
A type of broadband connection that provides authentication (username and password) in
addition to data transport.
PPTP (Point-to-Point
Tunneling Protocol)
A VPN protocol that allows the Point-to-Point Protocol (PPP) to be tunneled through an IP
network. This protocol is also used as a type of broadband connection in Europe.
RADIUS (Remote
Authentication Dial-In
User Service)
An AAA (authentication, authorization and accounting) protocol for applications such as
network access or IP mobility. It is intended to work in both local and roaming situations. It is
a client/server protocol and software that enables remote access servers to communicate
with a central server to authenticate dial-in users and authorize their access to the requested
system or service. RADIUS allows a company to maintain user profiles in a central database
that all remote servers can share. It provides better security, allowing a company to set up a
policy that can be applied at a single administered network point. Having a central service also
means that it’s easier to track usage for billing and for keeping network statistics. RADIUS is
a de facto industry standard used by a number of network product companies and is a
proposed IETF standard. RADIUS was originally developed by Livingston Enterprises for their
PortMaster series of Network Access Servers, but later (1997) published as RFC 2058 and
RFC 2059 (current versions are RFC 2865 and RFC 2866). The DIAMETER protocol is the
planned replacement for RADIUS, but is still backwards compatible.
RTS Threshold
The number of bytes used for the RTS/CTS handshake boundary. When a packet size is
greater than the RTS threshold, the RTS/CTS handshake is performed.
Roaming
The ability to take a wireless device from one access point’s range to another without losing
the connection.
Router
A networking device that connects multiple networks together.
RTS (Request To Send)
A networking method of coordinating large packets through the RTS threshold setting.
Server
Any computer whose function in a network is to provide user access to files, printing,
communications and other services.
SPI (Stateful Packet
Inspection) Firewall
A technology that inspects every incoming packet of information before allowing it to enter
the network.
Spread Spectrum
A wide-band radio frequency technique used for more reliable and secure data
transmission.
SSID (Service Set
IDentifier)
A Service Set ID is a network ID unique to a network. Only clients and access points that
share the same SSID are able to communicate with each other.
Static IP Address
A fixed address assigned to a computer or device that is connected to a network.
Static Routing
Forwarding data in a network via a fixed path.
Subnet Mask
An address code that determines the size of the network.
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