Agilent Technologies Agilent E5810A, Руководство пользователя

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Glossary 165
Glossary
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Intelligent hubs
include additional features that enables an administrator
to monitor the traffic passing through the hub and to configure each port
in the hub. Intelligent hubs are also called manageable hubs.
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Switching hubs
actually read the destination address of each packet
and then forward the packet to the correct port.
I
instrument
A device that accepts commands and performs a test or measurement
function.
interface
A connection and communication media between devices and
controllers, including mechanical, electrical, and protocol connections.
IP Address
An Internet Protocol (IP) address is an identifier for a computer or device
on a TCP/IP network. Networks using the TCP/IP protocol route
messages based on the IP address of the destination. The format of an
IP address is a 32-bit numeric address written as four numbers
separated by periods. Each number can be zero to 255. For example,
1.160.10.240 could be an IP address.
Within an isolated network, you can assign IP addresses at random as
long as each one is unique. However, connecting a private network to
the Internet requires using registered IP addresses (called Internet
addresses) to avoid duplicates. The four numbers in an IP address are
used in different ways to identify a particular network and a host on that
network. The InterNIC Registration Service assigns Internet addresses
from the following three classes.
„
Class A - supports 16 million hosts on each of 127 networks
„
Class B - supports 65,000 hosts on each of 16,000 networks
„
Class C - supports 254 hosts on each of 2 million networks