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hosts.txt
The original file containing the list of all Internet hosts. This file has been deprecated, but Unix variants still maintain a local ``/etc/hosts`` containing mappings between names and IP addresses. See http://man7.org/linux/man-pages/man5/hosts.5.html for a description of the format of this file on Linux.
HTML
The HyperText Markup Language specifies the structure and the syntax of the documents that are exchanged on the world wide web. HTML is maintained by the `HTML working group <https://www.w3.org/html/wg/>`_ of the :term:`W3C`
HTTP
The HyperText Transport Protocol is defined in :rfc:`2616`
hub
A relay operating in the physical layer.
IANA
The Internet Assigned Numbers Authority (IANA) is responsible for the coordination of the DNS Root, IP addressing, and other Internet protocol resources
iBGP
An iBGP session is a BGP between two routers belonging to the same Autonomous System. Also called an internal BGP session.
ICANN
The Internet Corporation for Assigned Names and Numbers (ICANN) coordinates the allocation of domain names, IP addresses and AS numbers as well protocol parameters. It also coordinates the operation and the evolution of the DNS root name servers.
IETF
The Internet Engineering Task Force is a non-profit organization that develops the standards for the protocols used in the Internet. The IETF mainly covers the transport and network layers. Several application layer protocols are also standardized within the IETF. The work in the IETF is organized in working groups. Most of the work is performed by exchanging emails and there are three IETF meetings every year. Participation is open to anyone. See https://www.ietf.org
IGP
Interior Gateway Protocol. Synonym of intradomain routing protocol
IGRP
The Interior Gateway Routing Protocol (IGRP) is a proprietary intradomain routing protocol that uses distance vector. IGRP supports multiple metrics for each route but has been replaced by :term:`EIGRP`