Application Layer

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Learn the purpose of the OSI presentation layer, including data translation, encryption, compression, and format compatibility.

Understand the OSI application layer, its role in user-facing network services, and common protocols such as HTTP, DNS, SMTP, and FTP.

Review CCNA interview questions about the OSI model, ports, segmentation, fragmentation, FCS, CRC, encapsulation, and troubleshooting.

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