ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
AWS Transit Gateway is being deployed to interconnect several VPCs with an on-premises network. A junior engineer insists the appliance works at the Data Link layer because it bridges segments. To set correct security expectations, you must identify the OSI layer at which the transit gateway primarily operates. Which OSI layer should you cite?
An AWS Transit Gateway functions as a cloud router, making forwarding decisions based on IP routing tables. Forwarding based on logical network (IP) addresses is characteristic of the Network layer (Layer 3) in the OSI model. The Data Link layer (Layer 2) deals with MAC addressing and frame switching, which a transit gateway does not perform. The Transport layer (Layer 4) handles end-to-end sessions such as TCP/UDP, and the Application layer (Layer 7) deals with application protocols-neither describes the gateway's primary role. Therefore, the Network layer is the appropriate classification.
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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