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CCNA Switching and Network Access Practice Question
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
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Correct answer & explanation
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Examine the source and destination MAC addresses in the Ethernet header to verify Layer 2 connectivity.
The logical troubleshooting sequence for packet capture analysis starts at Layer 2 to verify the data link layer. First, examine the source and destination MAC addresses in the Ethernet header to confirm correct frame delivery. Next, check for ARP requests and responses to ensure proper IP-to-MAC resolution. Then, analyze the source and destination IP addresses to verify Layer 3 addressing and routing. After that, look for ICMP Destination Unreachable or Time Exceeded messages to identify network path issues. Proceed to inspect transport layer port numbers (TCP/UDP) to identify the service and possible blocking. Finally, review TCP flags (e.g., SYN, RST, FIN) to understand session state and detect retransmissions or connection issues.
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 |
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Interpreting Packet Capture Output for Layer 2/3 Troubleshooting
Key term
Ethernet
Ethernet is a wired networking technology that connects devices like computers, printers, and servers to each other and to the internet using cables.
Key term
TCP
TCP (Transmission Control Protocol) is a core internet protocol that ensures data is sent reliably and in order between devices over a network.
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