Yokogawa Standalone MW100 - Manual (Page 295)

App-21
IM MW100-01E
Appendix
1
2
3
4
5
App
Index
Appendix 6 Network Terminology
Network Terminology
Term
Description
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 IP address of the access destination does not specify a specific gateway, data is sent
to the host designated as the default gateway.
DNS Abbreviation 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 Abbreviation for Dynamic Host Configuration Protocol.
A protocol that automatically assigns required information such as an IP address to the computer
that is temporarily connecting to the Internet. The DHCP server provides the information to the
computer (client) that access the server. If the client finishes the communication, the server
withdraws the address and assigns it to another computer.
HTTP Abbreviation for HyperText Transfer Protocol.
A protocol used to exchange data between the Web server and the client (Web browser, etc.).
HTML documents and image, sound, video files that are linked to the document can be exchanged
including the expression information.
SNTP Abbreviation 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 constructs 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 the application of the client querying the time to the server.
SMTP Abbreviation for Simple Mail Transfer Protocol.
A protocol used to transmit e-mail on the Internet. It is used to exchange mail between servers and
used by the client to send mail to the server.
FTP Abbreviation for File Transfer Protocol.
A protocol used to transfer files over the TCP/IP network such as the Internet.
POP3 Abbreviation for Post Office Protocol version 3
A protocol used to receive mail from a server storing e-mail on the intranet or Internet. POP3 is
currently the most popular protocol.
POP before SMTP One of the user authentication methods used when sending e-mail. Access to the SMTP server is
granted by accessing the specific POP3 server first before sending the e-mail.
PASV mode Passive (PASV) 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 PASV mode is necessary.
WebDAV Abbreviation for Distributed Authoring and Versioning protocol for the WWW.
Specifications that expands HTTP used to transfer files on the WWW so that the files and folders on
the Web server can be managed from the client (Web browser). It allows (1) the document created
on the client to be transmitted to the server for disclosure, (2) the list of folders and files on the
server to be retrieved, and (3) the files and folders to be copied, moved, and deleted.