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POP(3) (Post Office Protocol Version 3)
A protocol for receiving e-mail stored on a server
on the Internet or an Intranet.
Port number
A sub or auxiliary address that is provided under
the IP address to enable a simultaneous
connection with two or more peers in Internet
(TCP, UDP, etc.) communications
Primary DNS server
Normally, applicants for domain names must
provide two servers, and this is the main server.
Private IP address
An IP address that is assigned for connection to
a network such as a company LAN. Private IP
addresses can be freely assigned in a company
without having to apply for them. Note, however,
that even if a PC is assigned a private IP
address, that PC cannot access the Internet; it
must pass via a router or other device that is
assigned a global IP address.
Protocol
A set of rules governing the format of
communications when exchanging various kinds
of information and data with lots of different kinds
of PCs. One such protocol on the Internet is
"TCP/IP".
Proxy server
Software that runs on a PC located at the
boundary between a company network and the
Internet that acts as a proxy on behalf of trusted
clients (in the company network) and untrusted
hosts (on the Internet). Proxy servers allow
connection to specific sites outside the company
network and block illegal accessing of the
company network from undesirable outside sites.
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QVGA
320 x 240 pixel resolution
Router
A device located at the boundary between
different networks that performs the role of
making sure that sent data reaches the target
location on the destination network. If data on
the network is addressed to an external network,
routers send that data to the outside of the
network after judging the optimum route by
which to send that data.
SD memory card (Secure Digital memory card)
A compact, light removable external memory
card that has a large data storage capacity.
Secondary (DNS) server
Normally, applicants for domain names must
provide two servers, a primary and a secondary
DNS server. If trouble occurs on the primary
server, the secondary server takes over
processing from the primary server.
SMTP (Simple Mail Transfer Protocol)
A TCP/IP protocol for sending e-mail on the
Internet or an Intranet. SMTP is used for sending
e-mail between servers and is used by clients to
send e-mail to servers.
SMTP authentication (Simple Mail Transfer
Protocol authentication)
SMTP mail transfer protocol appended with a
user authentication function. Since it
authenticates passwords with user accounts
between SMTP servers and clients, both SMTP
servers and clients must support SMTP
authentication.
SMTP server (SMTP server)
A server that supports SMTP, currently the most
widely used mail transfer protocol.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing
networked communications devices, such as
routers, PCs, cameras and networkdisk
recorders via a network.
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