ANS-C01 Network Design Practice Question
Exhibit
Refer to the exhibit. The following is a VPC Flow Logs entry: 2 123456789010 eni-1234567890abcdef 10.0.1.5 10.0.2.10 443 80 6 10 5000 1620000000 1620000060 ACCEPT OK
Based on the following VPC Flow Logs entry, which of the following statements is correct? - source IP: 10.0.2.10 - source port: 443 - destination IP: 10.0.1.20 - destination port: 80 - protocol: TCP
⚠ Common exam trap
Many exam-takers assume the destination port is always the server's listening port, but in this flow log, the server (10.0.2.10) is the source using port 443, and the client (10.0.1.20) is the destination using port 80, so the traffic is from server to client.
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
✓
The traffic originated from a web server (port 443) and was sent to a client (port 80)
Based on the VPC Flow Logs entry (which shows source IP 10.0.2.10, source port 443, destination IP 10.0.1.20, destination port 80, protocol TCP), the traffic originated from a web server (listening on port 443) and was sent to a client (listening on port 80). The direction is from the source (10.0.2.10) to the destination (10.0.1.20). Therefore, option D is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The destination port is 443
Why it's wrong here
Destination port is 80.
- ✗
The protocol used is UDP
Why it's wrong here
Protocol 6 is TCP.
- ✗
The source IP address is 10.0.2.10
Why it's wrong here
The source IP is 10.0.1.5.
- ✓
The traffic originated from a web server (port 443) and was sent to a client (port 80)
Why this is correct
Source port 443 indicates the server is sending data to a client on port 80.
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Written by Johnson Ajibi, MSc IT Security
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