Glossary - Configuration - P54592-P101-A1 - P54592-P118-A1

The DNS (Domain Name System) is a protocol that enables hierarchical names for internet domains and addresses. The protocol includes the means to translate between numerical IP addresses and text hostnames. [SOURCE: IEC 62481-1-1:2017 Digital living network alliance (DLNA) home networked device interoperability guidelines - Part 1-1: Architecture and protocols - Core architecture and protocols]

A DNS (Domain Name System) server is a computer server that contains a database of public IP addresses and their associated hostnames, and in most cases, serves to resolve, or translate, those common names to IP addresses as requested. [SOURCE: Lifewire (2018): "What Is a DNS Server?". <https://www.lifewire.com/what-is-a-dns-server-2625854> (State 2018.08.26 Access: 2018.10.16)]

FQDN (Fully Qualified Domain Name) is a domain name which specifies its exact location in the tree hierarchy of the domain name system (DNS). FQDN specifies all domain levels, starting from the host name up to the top-level domain. [SOURCE: DIN EN 50463-4, VDE 0115-480-4:2018-03. Railway applications – Energy measurement on board trains –Part 4: Communication. German version EN 50463-4:2017]. Example: md2wxeec.xy003.company.en. is a FQDN where “md2wxeec” is the hostname, “xy003” is the subdomain name, “company” is the domain name and “en” is the top-level domain name.

A hostname is a unique identifier for a machine on a network. This identifier shall be unique within a local network. However, it may also be globally unique. The identifier can be an IP address. [SOURCE: DIN EN 62541-4:2015-10, OPC unified architecture - Part 4: Services (IEC 62541-4:2015)]

NTP (Network Time Protocol) is a standard for synchronizing computer system clocks in packet-based communication networks. NTP uses the connectionless network protocol UDP (see UDP) for enabling time to be reliably transmitted over networks with variable packet runtime. [SOURCE: DIN EN 62676-1-2:2014-11;VDE 0830-7-5-12:2014-11, Video surveillance systems for use in security applications - Part 1-2: System requirements - Performance requirements for video transmission (IEC 62676-1-2:2013)]