> For the complete documentation index, see [llms.txt](https://ccie.nyquist.eu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols.md).

# Layer 2 WAN Protocols

- [HDLC](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/hdlc.md)
- [HDLC 101](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/hdlc/hdlc-101.md)
- [PPP](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp.md)
- [PPP 101](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/ppp-101.md)
- [PPP Authentication - PAP](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/ppp-authentication-pap.md)
- [PPP Authentication – CHAP](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/ppp-authentication-chap.md)
- [PPP Authentication – EAP](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/ppp-authentication-eap.md)
- [PPP Multilink](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/ppp-multilink.md)
- [PPPoFR – PPP over Frame Relay](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/pppofr-ppp-over-frame-relay.md)
- [PPPoE – PPP over Ethernet](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/ppp/pppoe-ppp-over-ethernet.md)
- [Frame Relay](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay.md)
- [Frame Relay 101](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/frame-relay-101.md)
- [Frame Relay 102](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/frame-relay-102.md)
- [Frame Relay Encapsulations – IETF vs Cisco](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/frame-relay-encapsulations-ietf-vs-cisco.md)
- [Multilink Frame Relay](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/multilink-frame-relay.md)
- [Frame Relay Switching](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/frame-relay-switching.md)
- [Routing over Frame Relay](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/frame-relay/routing-over-frame-relay.md)
- [Bridging](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/bridging.md)
- [Bridging on a router](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/bridging/bridging-on-a-router.md)
- [MTU 101](https://ccie.nyquist.eu/layer-2-technologies/layer-2-wan-protocols/bridging/mtu-101.md)