N10-009 · Question #201
N10-009 Question #201: Real Exam Question with Answer & Explanation
The correct answer is A: Presentation. The Presentation Layer (Layer 6) of the OSI model is responsible for data translation, encryption, and compression, making it the primary layer for end-to-end encryption to ensure data readability for the application layer.
Question
Which of the following layers of the OSI model is responsible for end-to-end encryption?
Options
- APresentation
- BApplication
- CSession
- DTransport
Explanation
The Presentation Layer (Layer 6) of the OSI model is responsible for data translation, encryption, and compression, making it the primary layer for end-to-end encryption to ensure data readability for the application layer.
Common mistakes.
- B. The Application Layer (Layer 7) provides network services to end-user applications but typically relies on lower layers for encryption, though some application-specific encryption can occur here.
- C. The Session Layer (Layer 5) establishes, manages, and terminates connections between applications but does not handle encryption itself.
- D. The Transport Layer (Layer 4) provides reliable data transfer and flow control but does not natively provide end-to-end encryption for the application data itself, though transport security protocols like IPsec operate at or below it for network-level security.
Concept tested. OSI Model - Presentation Layer functions (encryption)
Reference. https://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-0/planning/guide/ipsccap3.html
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