# Layer 2 WAN Protocols

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