- A
Network Layer (Layer 3)
Why wrong: Network layer deals with IP addressing and routing.
- B
Application Layer (Layer 7)
Why wrong: Application layer includes protocols like HTTP.
- C
Transport Layer (Layer 4)
TCP is at Layer 4; SYN flood targets TCP connections.
- D
Data Link Layer (Layer 2)
Why wrong: Data link layer handles MAC addresses and frames.
Question 902 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.
In the OSI model, which layer is primarily targeted by a 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
✓
Transport Layer (Layer 4)
A SYN flood attack targets the Transport Layer (Layer 4) by exploiting the TCP three-way handshake. The attacker sends a high volume of SYN packets with spoofed source IP addresses, causing the target server to allocate resources for half-open connections that never complete, eventually exhausting its connection queue and denying service to legitimate users.
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.
- ✗
Network Layer (Layer 3)
Why it's wrong here
Network layer deals with IP addressing and routing.
- ✗
Application Layer (Layer 7)
Why it's wrong here
Application layer includes protocols like HTTP.
- ✓
Transport Layer (Layer 4)
Why this is correct
TCP is at Layer 4; SYN flood targets TCP connections.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Data Link Layer (Layer 2)
Why it's wrong here
Data link layer handles MAC addresses and frames.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the Transport Layer (Layer 4) and the Network Layer (Layer 3), where candidates mistakenly associate IP spoofing (a Layer 3 technique) with the attack's target layer, rather than recognizing that the attack exploits TCP's stateful handshake at Layer 4.
Detailed technical explanation
How to think about this question
Under the hood, a SYN flood leverages the TCP backlog queue (the 'syn backlog' parameter in Linux, controlled by net.ipv4.tcp_max_syn_backlog). Each incoming SYN causes the kernel to allocate a Transmission Control Block (TCB) entry, which remains in a SYN_RECEIVED state for a timeout period (typically 60-120 seconds). In a real-world scenario, a distributed SYN flood can overwhelm a server's memory and CPU before mitigation techniques like SYN cookies (RFC 4987) or rate-limiting via iptables take effect.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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: Transport Layer (Layer 4) — A SYN flood attack targets the Transport Layer (Layer 4) by exploiting the TCP three-way handshake. The attacker sends a high volume of SYN packets with spoofed source IP addresses, causing the target server to allocate resources for half-open connections that never complete, eventually exhausting its connection queue and denying service to legitimate users.
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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