ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
During packet capture on an application server, you notice that a web request payload is still visible while the destination MAC address has already been added. According to the OSI model encapsulation order, which protocol data unit was just created immediately before the frame header was added to the bit stream?
An HTTP message generated at the Application layer
In the OSI encapsulation process, user data is wrapped with protocol headers (and trailers) as it descends the stack. The sequence is: Application data, Transportâlayer segment, Networkâlayer packet, Data-link frame, then Physical-layer bits. MAC addresses are introduced in the frame header at the Data-link layer. Therefore, the PDU that exists right before the frame is formed-and before the bit stream is placed on the medium-is the Network-layer packet that still carries the Transport segment and application payload. The other options occur either earlier (TCP segment, HTTP message) or later (bit stream) in the encapsulation chain.
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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