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| Layer | No | Title |
| 1661 | The Point-to-Point Protocol (PPP) | |
| 2516 | A Method for Transmitting PPP Over Ethernet (PPPoE) | |
| 1994 | PPP Challenge Handshake Authentication Protocol (CHAP) | |
| 0791 | Internet Protocol | |
| 2460 | Internet Protocol, Version 6 (IPv6) Specification | |
| 0792 | Internet Control Message Protocol | |
| 0793 | Transmission Control Protocol | |
| 0768 | User Datagram Protocol | |
| 0959 | File Transfer Protocol | |
| 2821 | Simple Mail Transfer Protocol | |
| 1939 | Post Office Protocol - Version 3 |
