Network Interface Layer

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The bottommost layer of the Internet protocol suite (TCP/IP) is the Network Interface Layer. It defines the software and hardware used to carry TCP/IP traffic across an underlying network technology. In the language of the OSI Reference Model (OSI-RM), the Network Interface Layer corresponds to the Physical Layer and Data Link Layer (DLL). In the old adage, "IP over everything," the Network Interface Layer is the everything (or anything) over which IP can run. That includes any local area network (LAN), metropolitan area network (MAN), or wide area network (WAN) technology. Examples include:

Network Interface Layer
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Network Interface Layer

The Internet Engineering Task Force (IETF) also identifies IP traffic over the following interfaces: SONET, Small Computer System Interface (SCSI), and High Performance Parallel Interface (HIPPI).

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