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IPv4
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==Purpose== The Internet Protocol is the protocol that defines and enables [[internetwork]]ing at the [[internet layer]] of the Internet Protocol Suite. In essence it forms the Internet. It uses a logical addressing system and performs ''routing'', which is the forwarding of packets from a source host to the next router that is one hop closer to the intended destination host on another network. IPv4 is a [[connectionless]] protocol, and operates on a [[best-effort delivery]] model, in that it does not guarantee delivery, nor does it assure proper sequencing or avoidance of duplicate delivery. These aspects, including data integrity, are addressed by an [[upper layer protocol|upper layer]] transport protocol, such as the [[Transmission Control Protocol]] (TCP).
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