FORE Systems ES-2810 Ethernet Switch User's Manual
Glossary - 17
Glossary
Glossary
Interim Local Management Interface (ILMI) - the standard that specifies the use of the Simple
Network Management Protocol (SNMP) and an ATM management information base (MIB) to
provide network status and configuration information.
Intermediate System (IS) - a system that provides forwarding functions or relaying functions or
both for a specific ATM connection. OAM cells may be generated and received.
International Standards Organization (ISO) - a voluntary, non treaty organization founded in
1946 that is responsible for creating international standards in many areas, including comput-
ers and communications.
International Telephone and Telegraph Consultative Committee (CCITT) - the international stan-
dards body for telecommunications.
Internet - (note the capital “I”) the largest internet in the world including large national back-
bone nets and many regional and local networks worldwide. The Internet uses the TCP/IP
suite. Networks with only e-mail connectivity are not considered on the Internet.
internet - while an internet is a network, the term “internet” is usually used to refer to a collec-
tion of networks interconnected with routers.
Internet Addresses - the numbers used to identify hosts on an internet network. Internet host
numbers are divided into two parts; the first is the network number and the second, or local,
part is a host number on that particular network. There are also three classes of networks in
the Internet, based on the number of hosts on a given network. Large networks are classified
as Class A, having addresses in the range 1-126 and having a maximum of 16,387,064 hosts.
Medium networks are classified as Class B, with addresses in the range 128-191 and with a
maximum of 64,516 hosts. Small networks are classified as Class C, having addresses in the
range 192-254 with a maximum of 254 hosts. Addresses are given as dotted decimal numbers
in the following format:
nnn.nnn.nnn.nnn
In a Class A network, the first of the numbers is the network number, the last three numbers
are the local host address.
In a Class B network, the first two numbers are the network, the last two are the local host
address.
In a Class C network, the first three numbers are the network address, the last number is the
local host address.
The following table summarizes the classes and sizes:
Class First # Max# Hosts
A 1-126 16,387,064
B 129-191 64,516
C 192-223 254
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