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Quick Answer
The correct order for packet capture troubleshooting steps begins by examining the source and destination MAC addresses in the Ethernet header to verify Layer 2 connectivity. This bottom-up approach is essential because Layer 2 framing must be intact before any higher-layer analysis can be trusted; if MAC addresses are incorrect or missing, the frame never reached the correct local segment. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your ability to apply the OSI model logically, with a common trap being to jump straight to IP addresses or port numbers while ignoring corrupted or misdirected Ethernet frames. The sequence then moves through ARP validation, IP header inspection, ICMP error analysis, and finally transport-layer details like ports and flags. A reliable memory tip is “MAC before IP, ICMP before ports,” reinforcing that you must confirm each layer’s success before moving up the stack.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. 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 steps into the correct order to interpret packet capture output for L2/L3 troubleshooting.
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
✓
Examine the source and destination MAC addresses in the Ethernet header to verify Layer 2 connectivity.
The correct sequence follows a bottom-up troubleshooting approach, starting at the data link layer and progressing to the transport layer. Verifying MAC addresses first confirms that Layer 2 framing and delivery are working. Checking ARP ensures that IP-to-MAC resolution is successful, which is a prerequisite for Layer 3 communication. Analyzing IP headers validates network-layer addressing and routing. ICMP error messages often indicate specific routing or reachability problems. Finally, inspecting transport-layer details (ports, flags, and session states) provides insight into application connectivity without being misled by lower-layer issues.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Switching and Network Access — This question tests Switching and Network Access — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Examine the source and destination MAC addresses in the Ethernet header to verify Layer 2 connectivity. — The correct sequence follows a bottom-up troubleshooting approach, starting at the data link layer and progressing to the transport layer. Verifying MAC addresses first confirms that Layer 2 framing and delivery are working. Checking ARP ensures that IP-to-MAC resolution is successful, which is a prerequisite for Layer 3 communication. Analyzing IP headers validates network-layer addressing and routing. ICMP error messages often indicate specific routing or reachability problems. Finally, inspecting transport-layer details (ports, flags, and session states) provides insight into application connectivity without being misled by lower-layer issues.
What should I do if I get this 200-301 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 14, 2026
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