Yokogawa Button Operated MV2000 - Manual (Page 173)

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Appendix
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App
Index
Appendix 6 Network Terminology
Network Terminology
Term Explanation
IP address An ID that is assigned to each PC or communication device on an IP network such as
the Internet or an intranet. The address is a 32-bit value expressed using four octets in
decimal notation (each 0 to 255), each separated by a period as in 211.9.36.148.
Subnet mask TCP/IP networks such as the Internet are often divided up into smaller networks called
sub networks. The subnet mask is a 32 bit value that specifies the number of bits of the
IP address used to identify the network address.
Default gateway A representative router or computer that is used when accessing a computer outside its
own network. If the access destination IP address does not specify a specific gateway,
data is sent to the host designated as the default gateway.
DNS An acronym for Domain Name System. A computer that converts the domain name,
which is the name of the computer on the Internet, to four octets called the IP address.
Each name server contains a mapping table of domain names and IP addresses in the
network that the server manages and responds to external inquiries.
DHCP An acronym for Dynamic Host Configuration Protocol. It is a protocol that allocates IP
address and other settings that a PC needs to connect temporarily to the Internet. The
DHCP server provides the information to a computer (client) that accesses the server. If
a client finishes the communication, the server withdraws the address and assigns it to
another computer.
HTTP An acronym for HyperText Transfer Protocol. A protocol used to exchange data between
a Web server and a client (Web browser, etc.). HTML documents as well as image,
sound, and video files that are linked to them can be exchanged along with formatting
information.
SNTP An acronym for Simple Network Time Protocol. One of the protocols used to synchronize
the computer clock via the TCP/IP network. It is an abbreviated version of NTP. NTP
is a protocol that configures time information servers in a hierarchy and synchronizes
the clock by exchanging information. SNTP omits the complicated sections of the NTP
specifications and specializes in serving clients that query time information.
SMTP An acronym for Simple Mail Transfer Protocol. A protocol used to transmit e-mail over the
Internet. It is used to exchange mail between servers and used by the client to send mail
to the server.
FTP An acronym for File Transfer Protocol. A protocol used to transfer files over a TCP/IP
network such as the Internet.
POP3 An acronym for Post Office Protocol version 3. A protocol used to receive mail over the
intranet or Internet from a server that stores e-mail.
POP before SMTP One of the user authentication methods for e-mail transmission. Access to the SMTP
server is granted after a specific POP3 server is accessed first.
PASV mode Passive mode of the file transfer protocol FTP (method by which the FTP server notifies
the port for making the connection). This mode is required when transferring files across
a firewall. Check with your network administrator on whether or not you need to set PASV
mode.