Layer 4 Virtual Circuits
Connection oriented transport layer datalink protocols such as TCP may rely on a connectionless packet switching network layer protocol such as IP, where different packets may be routed over different paths, and thus be delivered out of order. However, a virtual circuit is possible since TCP includes segment numbering and reordering on the receiver side to prevent out-of-order delivery.
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—Robert M. Pirsig (b. 1928)