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