Define the 4 different layers of the TCP/IP Reference Model

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Layers of TCP/IP

Layer	Description
Link	Decides which links such as serial lines or classic Ethernet must be USED to meet the needs of the CONNECTIONLESS internet layer.
Internet	The internet layer is the most important layer which holds the whole ARCHITECTURE together. It delivers the IP packets where they are SUPPOSED to be delivered.
Transport	Its FUNCTIONALITY is almost the same as the OSI transport layer. It enables peer entities on the network to carry on a conversation.
Application	It contains all the higher-level protocols.

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