Networks and Communications

Layers in TCP/IP

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Sean Garcia

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What are the Layers in the TCP/IP model?
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The purpose of the TCP/IP model is to protect data integrity maintain communications reliably. The TCP/IP model is organised into four layers, in which each layer is defined by its role in the data transmission process. The four layers of the TCP/IP model are: Internet layer Layer 1 – Network Access layer Note: the TCP/IP layers are often represented in a top-down manner from layer 4 to layer 1 but it is also possible to represent the model in the reverse order layer 1 to layer 4.


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Layer 4: Application Layer
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The Application Layer includes protocols that applications use in order to exchange data in a standardised way. For example: • Hypertext Transfer Protocol (HTTP) • File Transfer Protocol (FTP) • Simple Mail Transfer Protocol (SMTP)

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Layer 3: Transport Layer
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The Transport Layer consists of protocols concerned with the reliable and error-free end-to-end communication of data. For example: • Transmission Control Protocol (TCP) • User Datagram Protocol (UDP)

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Layer 2: Internet Layer
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The Internet Layer defines protocols that handle the packaging, addressing and routing of data before transmission across physical media. For example: • Internet Protocol (IP) – IP v4 and IP v6 • Address Resolution Protocol (ARP)

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Layer One: Network Access Layer
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The Network Access Layer consists of protocols that facilitate physical data transfer across network hardware (i.e cables and switches). For example: • CSMA/CA • CSMA/CD

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