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IS-IS
Intermediate System- Intermediate System. A link-state intradomain routing that was initially defined for the ISO CLNP protocol but was extended to support IP v4 and IP v6. IS-IS is often used in ISP networks. It is defined in [ISO10589]_
ISN
The Initial Sequence Number of a TCP connection is the sequence number chosen by the client ( resp. server) that is placed in the `SYN` (resp. `SYN+ACK`) segment during the establishment of the TCP connection.
ISO
The International Standardization Organization is an agency of the United Nations that is based in Geneva and develop standards on various topics. Within ISO, country representatives vote to approve or reject standards. Most of the work on the development of ISO standards is done in expert working groups. Additional information about ISO may be obtained from https://www.iso.org
ISO-3166
An :term:`ISO` standard that defines codes to represent countries and their subdivisions. See http://www.iso.org/iso/country_codes.htm
ISP
An Internet Service Provider, i.e. a network that provides Internet access to its clients.
ITU
The International Telecommunication Union is a United Nation's agency whose purpose is to develop standards for the telecommunication industry. It was initially created to standardize the basic telephone system but expanded later towards data networks. The work within ITU is mainly done by network specialists from the telecommunication industry (operators and vendors). See https://www.itu.int for more information
IXP
Internet eXchange Point. A location where routers belonging to different domains are attached to the same Local Area Network to establish peering sessions and exchange packets. See http://www.euro-ix.net/ or https://en.wikipedia.org/wiki/List_of_Internet_exchange_points_by_size for a partial list of IXPs.
LAN
Local Area Network
leased line
A telephone line that is permanently available between two endpoints.
MAN
Metropolitan Area Network