ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
While documenting cloud security controls, an engineer notes that the AWS Application Load Balancer is described as operating at the Application layer of the four-layer TCP/IP model. To record equivalent coverage in the seven-layer OSI model, which OSI layer or layers should the engineer list?
Layers 4, 5, 6, and 7 (Transport through Application)
Layers 5, 6, and 7 (Session, Presentation, and Application)
In the four-layer TCP/IP model, the topmost Application layer handles all functions related to user interaction, data representation, and session management. These responsibilities align with three separate layers in the seven-layer OSI model: the Session layer (Layer 5), the Presentation layer (Layer 6), and the Application layer (Layer 7). Therefore, when the Application Load Balancer is said to function at the TCP/IP Application layer, it implicitly spans OSI Layers 5-7. The other options omit one or more of these layers or include the Transport layer, which in the TCP/IP model is represented by its own distinct Transport layer, not by the Application layer.
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What is the purpose of the Session layer (Layer 5) in the OSI model?
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How does the Presentation layer (Layer 6) differ from the Application layer (Layer 7)?
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Why does the TCP/IP Application layer include functionalities across multiple OSI layers?
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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