Part II-2. TCP/IP NETWORK INTERFACE/INTERNET LAYER CONNECTION PROTOCOLS
The second layer of the OSI Reference Model is the data link layer; it corresponds to the TCP/IP network interface layer. At this layer, most local area network (LAN), wide area network (WAN), and wireless LAN (WLAN) technologies are defined, such as Ethernet and IEEE 802.11.
The third layer of the OSI Reference Model is the network layer, also called the internet layer in the TCP/IP model. At this layer, internetworking protocols are defined, the most notable being the Internet Protocol (IP).
The second and third layers are intimately related, because messages sent at the network layer must be carried over individual physical networks at the data link layer. ...
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