connection is not fixed.

PPP

The point-to-point protocol (PPP) is defined by the Internet Request For Comment documents RFC 1570, RFC 1661 and RFC 1662. With respect to the framing of packets, PPP is quite similar to HDLC, but supports both bit-oriented as well as byte-oriented ("octet-stuffed") methods of delimiting frames while maintaining data transparency.

Ethernet

Ethernet is a "local area network" (LAN) technology,

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