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Certified Ethical Hacker (CEH) Practice Question

While monitoring an enterprise LAN, you notice the following in a packet capture: Host A and Host B suddenly start sending large numbers of duplicate ACKs with the same acknowledgment numbers, and within a few milliseconds Host B issues a TCP RST that ends the flow. From a network-level session hijacking perspective, what is the most plausible explanation for this behavior?

  • An ICMP destination-unreachable message from a router caused Host B to close the session, producing the observed traffic.

  • The packets show normal congestion control; duplicate ACKs followed by a reset occur when the congestion window reaches zero.

  • A spoofing host injected TCP segments with an incorrect sequence number, creating an ACK storm that culminated in a connection reset.

  • Host A legitimately enabled TCP Fast Open, which can generate duplicate ACKs during option negotiation.

Certified Ethical Hacker (CEH)
Network and Perimeter Hacking
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