Specifications

Niagara Release 2.3
Niagara Networking & Connectivity Guide
Glossary
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crossover cable A crossover cable can be used to connect two computers together without a hub, or
to connect two hubs together (if the hub does not have an uplink port). If your hub
has an uplink port, then you should use a standard Ethernet patch cable to connect the
hubs instead.
D
daemon Typically, a process that performs administrative tasks for the operating system. It
runs in the background and performs tasks at predefined times or in response to
certain events.
In the Niagara environment, the Niagara daemon is an interface from the Admin Tool
to the operating system. On the JACE-4/5 it also manages dial connections for
captive ISP. On a Windows-based Niagara host, the Niagara service (which runs the
niagarad.exe program) performs the daemon function; on a JACE-4/5 this is
performed by the niagarad.exe program.
default gateway The IP address of a router used for communication with other networks. A host can
communicate with any other host on its local subnet directly, but the default gateway
defines the path to other hosts off the local subnet.
dialog box A graphical element (in the form of a box) used in Windows to display information
or request input. Typically, dialog boxes request information and pop-ups convey
information. They are both temporary—they disappear once you have entered the
requested information and click OK.
DDNS Dynamic DNS (DDNS) is an Internet standard that specifies an automatic method for
updating DNS records. DDNS can take one of two forms. It can be server-based
service implemented within a company to update DNS records for hosts on the
company LAN for local name resolution. It can also be service offered by some
Internet companies to update the name-to-address mapping of Internet hosts that
receive a dynamic IP address from their ISPs.
DHCP One of the techniques used to automatically assign network settings (such as IP
address, subnet mask, default gateway, and DNS server) to a host.
DNS The domain name system (DNS) is the mechanism used by hosts to resolve names
on the Internet, and on some private networks as well. Hosts that participate in the
DNS system have names like “www.tridium.com”. Domain names must be globally
unique so the data intended for that domain gets there and not to some other address.
See also fully qualified domain name.
double-click Some operations require a double-click, which means that you click the (left) mouse
button twice in rapid succession.