- A
Check physical connectivity, then data link, then network, then transport, then application
This is correct because the OSI bottom-up method starts at the physical layer and proceeds upward, ensuring lower-layer issues are resolved before higher-layer troubleshooting.
- B
Check application, then transport, then network, then data link, then physical
Why wrong: This is incorrect because it describes a top-down approach, not bottom-up.
- C
Check network, then data link, then physical, then transport, then application
Why wrong: This is incorrect because the order is not strictly bottom-up; it jumps from network to data link to physical, then back up to transport.
- D
Check physical, then network, then data link, then transport, then application
Why wrong: This is incorrect because the data link layer should be checked before the network layer in a bottom-up approach.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Drag and drop the following troubleshooting steps into the correct order to diagnose a client connectivity issue using the OSI bottom-up method.
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
Check physical connectivity, then data link, then network, then transport, then application
The OSI bottom-up method starts at physical layer and moves up. This ensures that lower-layer issues are resolved before higher-layer troubleshooting, preventing wasted effort on symptoms caused by underlying problems.
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.
- ✓
Check physical connectivity, then data link, then network, then transport, then application
Why this is correct
This is correct because the OSI bottom-up method starts at the physical layer and proceeds upward, ensuring lower-layer issues are resolved before higher-layer troubleshooting.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Check application, then transport, then network, then data link, then physical
Why it's wrong here
This is incorrect because it describes a top-down approach, not bottom-up.
- ✗
Check network, then data link, then physical, then transport, then application
Why it's wrong here
This is incorrect because the order is not strictly bottom-up; it jumps from network to data link to physical, then back up to transport.
- ✗
Check physical, then network, then data link, then transport, then application
Why it's wrong here
This is incorrect because the data link layer should be checked before the network layer in a bottom-up approach.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Check physical connectivity, then data link, then network, then transport, then applicationCorrect answer▾
Why this is correct
This is correct because the OSI bottom-up method starts at the physical layer and proceeds upward, ensuring lower-layer issues are resolved before higher-layer troubleshooting.
✗Check application, then transport, then network, then data link, then physicalWrong answer — click to see why▾
Why this is wrong here
The order is reversed; bottom-up starts at the physical layer, not the application layer.
Why candidates choose this
Candidates might confuse bottom-up with top-down troubleshooting, especially if they are more familiar with application-layer issues.
✗Check network, then data link, then physical, then transport, then applicationWrong answer — click to see why▾
Why this is wrong here
A true bottom-up approach must start at the physical layer and proceed sequentially upward without skipping or reordering.
Why candidates choose this
Candidates might think that checking the network layer first is efficient because it is often the source of connectivity issues, but this violates the bottom-up methodology.
✗Check physical, then network, then data link, then transport, then applicationWrong answer — click to see why▾
Why this is wrong here
The OSI model layers must be checked in order: physical, data link, network, transport, session, presentation, application. Skipping data link after physical is a common mistake.
Why candidates choose this
Candidates might overlook the data link layer because they focus on IP (network layer) issues, but bottom-up requires checking each layer sequentially.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 200-301 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.
What to study next
Got this wrong? Here's your next step.
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Network Infrastructure and Connectivity — study guide chapter
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check physical connectivity, then data link, then network, then transport, then application — The OSI bottom-up method starts at physical layer and moves up. This ensures that lower-layer issues are resolved before higher-layer troubleshooting, preventing wasted effort on symptoms caused by underlying problems.
What should I do if I get this 200-301 question wrong?
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 6, 2026
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