5
Glossary
Term
Explanation
IP address
(Internet protocol address)
The IP address is a 32-bit ID number allotted to equipment
connected to the Internet. The 32-bit number of the IP address is
usually divided into four 8-bit segments for display. The IP
address consists of a "network address" that identifies the
network and a "host address" that identifies the individual pieces
of equipment connected in the network.
Subnet mask
The subnet mask is a 32-bit number that defines what bits of the
IP address are used for the network address. The network
address segment of the IP address is determined by calculating
the logical AND of the IP address and subnet mask.
Default gateway
The default gateway is equipment such as a router that functions
as the "gateway" to the network. When there is communication
between different networks and there is no unique path for the
equipment to be accessed, the default gateway is used to
connect them.
Port number
The port No. is the sub-address that specifies one of several
programs running on equipment specified by the IP address.
Port numbers 502 or 1024-65535 are used as the sub-address.
MAC address
(Media Access Control
address)
MAC address is the one to identify the device on a network.
MAC address consists of 12 digits such as 01-23-45-67-89-AB.
