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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

During troubleshooting between two Linux-based application servers exchanging data over TCP across a VPN, you notice recurring zero-window notifications that trigger packet retransmissions. You explain to a junior colleague that the protocol enforcing segmentation, reliable end-to-end delivery, and flow control operates at which OSI layer?

  • Session layer (Layer 5)

  • Data Link layer (Layer 2)

  • Network layer (Layer 3)

  • Transport layer (Layer 4)

ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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