Point-to-point Protocol - PPP and Tunnels

PPP and Tunnels

**Simplified OSI protocol stack for an example SSH+PPP tunnel**
Application	FTP	SMTP	HTTP	…	DNS	…
Transport	TCP				UDP
Network	IP
Data Link	PPP
Application	SSH
Transport	TCP
Network	IP
Data Link	Ethernet			ATM
Physical	Cables, NICs, and so on

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