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Point-to-Point Protocol (PPP)
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RFC
RFC
RFC 2341 - Cisco Layer Two Forwarding Protocol (L2F)
RFC 1994 - PPP Challenge Handshake Authentication Protocol (CHAP)
RFC 1990 - Multilink PPP
RFC 1661 - PPP
RFC 1618 - PPP over ISDN
RFC 1570 - PPP LCP Extensions
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