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Glossary
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Passive mode
The mode whereby a client FTP allows TCP connection
for data transmission to the FTP server.
POP server
A server for storing incoming e-mail until you have read
it.
Primary DNS server
One of the DNS servers that can first reply to a request
by connected devices or other DNS servers.
Proxy server
A server or software that acts as an intermediary
between a local network and the Internet so that it can
connect to the Internet in place of a computer on a local
network.
PSK
Abbreviation for Pre-Shared Key. This is a shared key to
make an encryption key, used with TKIP in WPA
encryption standard. PSK sometimes means an
authentication system using a key previously shared.
RADIUS client
RADIUS (Remote Authentication Dial-in User Service)
is an authentication and accounting protocol managing
network access, and a RADIUS client is a party that
accesses the network.
In Internet connecting service, a Network Access Server
(NAS) such as that for dial-up and broadband access
server is a RADIUS client. In a wireless LAN system, a
wireless LAN access point is a RADIUS client.
Saturation
The degree to which the color is pure.
Secondary DNS Server
Subsidiary DNS server used when a primary DNS server
cannot be used.
Shared secret
A character string to be used for mutual authentication
between RADIUS server and RADIUS client.
Sharpness
The degree to which the boundary of two portions is
clearly distinguished.
SMTP server
A server for sending or relaying e-mail messages
between servers.
SNMP
A protocol for monitoring and managing network
devices.
SSL
Abbreviation for Secure Sockets Layer. This is a
protocol developed by Netscape Communications
Corporation to be used for communications of encrypted
data on the Internet.
Subnet mask
32-bit stream used to distinguish the subnet address
from the IP address.
TCP
Abbreviation for Transmission Control Protocol. A
standard protocol used for the Internet connection.
Compared with the other protocol, UDP, TCP provides
reliable communication but the communication speed is
slower.
TKIP
Abbreviation for Temporal Key Integrity Protocol. This
is used in WPA encryption standard for wireless LAN.
TKIP provides high security because it changes
encryption keys based on PSK during an on-going
communication.
UDP
Abbreviation for User Datagram Protocol. A standard
protocol used for the Internet connection. Compared
with the other protocol, TCP, UDP can transmit data
faster, but reliable communication is not guaranteed.
Unicast
Transmission of the data to the specified equipment on a
network by specifying a single address.
WPA
Abbreviation for Wi-Fi Protected Access. This is an
encryption standard for wireless LAN. It provides
higher security than the conventional WEP (Wired
Equivalent Privacy) standard. In WPA, TKIP is used for
encryption method, and PSK and EAP are used for
authentication protocol.
WPA2
Abbreviation for Wi-Fi Protected Access 2. WPA2 is a
standard with which AES (Advanced Encryption
Standard) is added to WPA.