(NBFCP) for the NetBIOS Frames protocol (or NetBEUI as it was called before that), protocol code number 0x803F, RFC 2097
* the IPv6 Control Protocol (IPV6CP) for IPv6, protocol code number 0x8057, RFC 5072

Looped link detection

PPP detects looped links using a feature involving magic numbers. When the node sends PPP LCP

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