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200-901 Practice Question: Which THREE of the following are layers in the…
Which THREE of the following are layers in the OSI model? (Select exactly three.)
⚠ Common exam trap
Cisco often tests the distinction between the OSI and TCP/IP models, and the trap here is that candidates confuse the TCP/IP layers (Internet, Network Access) with OSI layers, leading them to select those incorrect options instead of the correct OSI layers like Data Link.
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
The Transport layer (Layer 4) of the OSI model is correct because it provides end-to-end communication, error recovery, and flow control between hosts. Protocols such as TCP and UDP operate at this layer, ensuring reliable or connectionless data delivery as required by applications.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Internet
Why it's wrong here
'Internet' is a layer in TCP/IP, not OSI.
- ✗
Network Access
Why it's wrong here
'Network Access' is a TCP/IP layer, not OSI.
- ✓
Transport
Why this is correct
Layer 4 of the OSI model.
- ✓
Presentation
Why this is correct
Layer 6 of the OSI model.
- ✓
Data Link
Why this is correct
Layer 2 of the OSI model.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.