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Data in an IP internetwork are sent in blocks referred to as packets or datagrams (the terms are basically synonymous in IP).
IP is the common element found in today's public Internet.
IP routing is performed by all hosts, but most importantly by internetwork routers, which typically use either interior gateway protocols (IGPs) or external gateway protocols (EGPs) to help make IP datagram forwarding decisions across IP connected networks.
An IP address (Internet Protocol address) is a unique number that devices use in order to identify and communicate with each other on a network utilizing the Internet Protocolstandard.
IP addresses are conceptually similar to phone numbers, except they are used in LANs (Local Area Network), WANs (Wide Area Network), or the Internet.
IP addresses are usually given out through a server service called DHCP or the Dynamic Host Configuration Protocol.