Network Encapsulation Types
WAN Layer 2 Encapsulation
HDLC, PPP and Frame relay are used for WAN Layer 2
On serial links, Cisco uses proprietry encapsulation HDLC by default. Use PPP with other non Cisco routers.
- HDLC is the default serial protocol and is Cisco propriety
- PPP is multivendor and uses the sub protocol LCP (Link Control Protocol)
On frame relay links - Cisco uses prorpietry encapsulation Cisco by default. Use IETF with other non Cisco routers.
LAN Layer 2 Encapsulation
Ethernet, Token Ring, FDDI are used for LAN Layer 2
VLAN Trunking Protocols
802.1q
ISL - (Cisco Inter-Switch Link), an older VLAN trunking protocol that is proprietary to Cisco
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