200-201 Security Monitoring Practice Question
Which OSI layer is associated with protocols such as HTTP, FTP, and SMTP, and is commonly targeted by application-layer attacks?
⚠ Common exam trap
Cisco often tests the misconception that HTTP and FTP are transport-layer protocols because they use TCP ports 80 and 21 respectively, but the trap is that these protocols operate at Layer 7, not 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
✓
Layer 7 - Application
HTTP, FTP, and SMTP are application-layer protocols that operate at Layer 7 of the OSI model. Application-layer attacks target this layer by exploiting vulnerabilities in the application logic, input validation, or protocol implementation, such as SQL injection, cross-site scripting (XSS), or buffer overflows in web servers.
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 2 - Data Link
Why it's wrong here
HTTP, FTP and SMTP operate at the Application layer (Layer 7), so Layer 2 framing, MAC addressing and Ethernet switching are irrelevant here. Layer 2 is tempting because Data Link attacks such as MAC flooding and ARP spoofing are common, but those target frames, not the named application protocols.
- ✓
Layer 7 - Application
Why this is correct
HTTP, FTP and SMTP are application-layer protocols operating at Layer 7, where they exchange user-facing data and commands. Application-layer attacks such as injection and cross-site scripting exploit these protocols directly, making Layer 7 the correct association.
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Layer 4 - Transport
Why it's wrong here
HTTP, FTP and SMTP are Application layer (Layer 7) protocols, not Transport layer ones; Layer 4 covers TCP and UDP port multiplexing and segmentation. Layer 4 is tempting because transport attacks like SYN flooding and port scanning are frequent, but the protocols named sit above it.
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Layer 3 - Network
Why it's wrong here
Layer 3 handles routing and logical addressing, carrying IP packets; HTTP, FTP and SMTP are application protocols that reside at Layer 7, where application-layer attacks occur. Layer 3 is tempting because those protocols traverse routed networks, but their attack surface is not the network layer.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.