- A
Layer 7 - Application
Why wrong: Application layer attacks target protocols like HTTP, not TCP handshake.
- B
Layer 4 - Transport
TCP is at the Transport layer, so a SYN flood targets Layer 4.
- C
Layer 3 - Network
Why wrong: IP is at Layer 3, but the attack is on TCP, which is Layer 4.
- D
Layer 2 - Data Link
Why wrong: SYN flood is a TCP attack, not a Layer 2 attack.
Question 601 of 1,000
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which OSI layer is targeted by a TCP SYN flood attack?
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
✓
Layer 4 - Transport
A TCP SYN flood attack targets the Transport layer (Layer 4) because it exploits the TCP three-way handshake mechanism. The attacker sends a high volume of SYN packets with spoofed source IP addresses, causing the server to allocate resources for half-open connections that never complete, exhausting its connection queue.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Layer 7 - Application
- ✓
Layer 4 - Transport
Why this is correct
TCP is at the Transport layer, so a SYN flood targets Layer 4.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Layer 3 - Network
Why it's wrong here
IP is at Layer 3, but the attack is on TCP, which is Layer 4.
- ✗
Layer 2 - Data Link
Why it's wrong here
SYN flood is a TCP attack, not a Layer 2 attack.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the layer where the vulnerability exists (Layer 4, TCP) versus the layer where the packet is encapsulated (Layer 3, IP), leading candidates to mistakenly choose Layer 3 because the attack uses IP packets.
Detailed technical explanation
How to think about this question
Under the hood, a SYN flood fills the server's SYN backlog queue (controlled by the tcp_max_syn_backlog kernel parameter in Linux). Modern mitigations include SYN cookies (RFC 4987), which encode connection state in the SYN-ACK sequence number, allowing the server to avoid storing state until the handshake completes. In a real-world scenario, a SYN flood can overwhelm a web server's connection table, causing legitimate clients to receive connection timeouts even if bandwidth is not saturated.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
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FAQ
Questions learners often ask
What does this 200-201 question test?
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Layer 4 - Transport — A TCP SYN flood attack targets the Transport layer (Layer 4) because it exploits the TCP three-way handshake mechanism. The attacker sends a high volume of SYN packets with spoofed source IP addresses, causing the server to allocate resources for half-open connections that never complete, exhausting its connection queue.
What should I do if I get this 200-201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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