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Diagram
of the TCP/IP Model - Network Layer |
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| The Network
Access Layer |
| In TCP/IP the Data Link Layer and Physical Layer
are normally grouped together. TCP/IP makes use of existing
Data Link and Physical Layer standards rather than defining
its own. Most RFCs that refer to the Data Link Layer describe
how IP utilizes existing data link protocols such as Ethernet,
Token Ring, FDDI, HSSI, and ATM. The characteristics of the
hardware that carries the communication signal are typically
defined by the Physical Layer. This describes attributes such
as pin configurations, voltage levels, and cable requirements.
Examples of Physical Layer standards are RS-232C, V.35, and
IEEE 802.3.
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