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Virtual circuit
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==Layer 4 virtual circuits== Connection oriented [[transport layer]] protocols such as [[Transmission Control Protocol|TCP]]<ref>RFC 793</ref><ref name="rfc1180">RFC 1180</ref> may rely on a connectionless packet switching network layer protocol such as [[Internet Protocol|IP]], where different packets may be routed over different paths, and thus be delivered out of order. However, it is possible to use TCP as a virtual circuit,<ref name="rfc1180" /><ref>RFC 955</ref><ref>RFC 1644</ref> since TCP includes segment numbering that allows reordering on the receiver side to accommodate out-of-order delivery.
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