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IETF
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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
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IGP
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Interior Gateway Protocol. Synonym of intradomain routing protocol
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IGRP
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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 IGRP supports multiple metrics for each route but has been replaced by :term:`EIGRP`
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IMAP
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The Internet Message Access Protocol (IMAP), defined in :rfc:`3501`, is an application-level protocol that allows a client to access and manipulate the emails stored on a server. With IMAP, the email messages remain on the server and are not downloaded on the client.
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Internet
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a public internet, i.e. a network composed of different networks that are running :term:`IPv4` or :term:`IPv6`
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internet
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an internet is an internetwork, i.e. a network composed of different networks. The :term:`Internet`, with a capital `I` corresponds to the global network that we use today, but other internetworks have been used in the path.
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inverse query
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For DNS servers and resolvers, an inverse query is a query for the domain name that corresponds to a given IP address.
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IP
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Internet Protocol is the generic term for the network layer protocol in the TCP/IP protocol suite. IP version 4 is widely used but IP version 6 is being deployed globally.
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IPv4
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is the version 4 of the Internet Protocol, the connectionless network layer protocol used in most of the Internet today. IPv4 addresses are encoded as a 32 bits field.
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IPv6
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is the version 6 of the Internet Protocol, the connectionless network layer protocol which is intended to replace IPv4. IP version 6 addresses are encoded as a 128 bits field.
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