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SSCP Practice Question: A security administrator receives an alert about…
A security administrator receives an alert about a potential SYN flood attack on a web server. At which OSI layer does this attack occur?
⚠ Common exam trap
Watch out — candidates often confuse the attack's effect on the application (e.g., web server unavailability) with the layer being attacked, incorrectly selecting Layer 7 instead of recognizing the TCP handshake at Layer 4.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Layer 4 (Transport)
A SYN flood attack exploits the TCP three-way handshake by sending a barrage of SYN packets without completing the handshake, exhausting server resources. This attack targets the Transport Layer (Layer 4), where TCP operates, as defined in RFC 793. The security administrator's alert specifically involves TCP SYN segments, which are Layer 4 protocol data units.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Layer 7 (Application)
Why it's wrong here
A SYN flood exploits the TCP three-way handshake, which operates at Layer 4 (Transport), not Layer 7. Layer 7 is tempting because application-layer attacks such as HTTP floods and SQL injection also target web servers, but they manipulate request content rather than exhausting half-open connection state.
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Layer 3 (Network)
Why it's wrong here
A SYN flood abuses TCP handshake state, placing it at Layer 4 (Transport); Layer 3 carries IP packets and routing, with no connection state to exhaust. Layer 3 is tempting because ICMP floods and IP fragmentation attacks are genuine network-layer denial-of-service techniques.
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Layer 2 (Data Link)
Why it's wrong here
A SYN flood targets TCP handshake state at Layer 4 (Transport); Layer 2 covers Ethernet framing and MAC addressing, which play no part in half-open connection exhaustion. Layer 2 is tempting because MAC flooding and ARP spoofing are real attacks that disrupt switching at the data-link layer.
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Layer 4 (Transport)
Why this is correct
SYN floods exploit the TCP three-way handshake, exhausting half-open connection tables. TCP operates at Layer 4, the Transport layer, where ports and connection state reside, so the attack is classified there rather than at Layers 3 or 7.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.