Data Link Layer
- delivers a piece of information across a single link. It organizes the physical layer’s bits into packets and controls who on a shared link gets each packet
Layer 2 Protocols that are also Layer 1
- 802.3 - Ethernet
- Wi-Fi
- InfiniBand (IB)
- Fibre Channel (FC)
- Digital Subscriber Line (DSL)
- Integrated Services Digital Network (ISDN)
- Fiber Distributed Data Interface (FDDI)
Strictly Layer 2 Protocols and/or Sublayers
- Address Resolution Protocol (ARP) - Reverse ARP (RARP)
- Layer 2 Tunneling Protocol (L2TP)
- 2.5 - Logical Link Control (LLC) - Data Link Sublayer
- Point-to-Point Protocol (PPP)
- Open Shortest Path First (OSPF)
- Neighborhood Discovery Protocol (NDP)