Reliable data transfer between directly connected nodes.
Coordinated access to a shared physical medium.
Multiplexing down from / multiplexing up to a network-layer protocol.
TLS security (including authentication) between directly connected nodes.
Lookup and forwarding on the basis of an IP destination address.
Bit-level error detection and correction.
End-end path determination through multiple IP routers.
Flow control between directly connected nodes.
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