Application Layer - This is where the network applications, such as web browsers or email programs, operate., Transport Layer - This layer sets up the communication between the two hosts and they agree settings such as the size of packets., Internet Layer - Addresses and packages data for transmission. Routes the packets across the network, Link Layer - This is where the network hardware such as the NIC (network interface card) is located. OS device drivers also sit here.,

AQA 3.5 4 layer TCP/IP model layers

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