CompTIA Security+ (SY0-401) — Question 37

Review the following diagram depicting communication between PC1 and PC2 on each side of a router. Analyze the network traffic logs which show communication between the two computers as captured by the computer with IP 10.2.2.10.

DIAGRAM -

PC1 PC2 -
[192.168.1.30]--[INSIDE 192.168.1.1 router OUTSIDE 10.2.2.1]--[10.2.2.10] LOGS
10:30:22, SRC 10.2.2.1:3030, DST 10.2.2.10:80, SYN
10:30:23, SRC 10.2.2.10:80, DST 10.2.2.1:3030, SYN/ACK
10:30:24, SRC 10.2.2.1:3030, DST 10.2.2.10:80, ACK
Given the above information, which of the following can be inferred about the above environment?

Answer options

• A. 192.168.1.30 is a web server.
• B. The web server listens on a non-standard port.
• C. The router filters port 80 traffic.
• D. The router implements NAT.

Correct answer: D

Explanation

The correct answer is D because the router performs Network Address Translation (NAT) by translating the private IP address of PC1 (192.168.1.30) to a public IP address (10.2.2.1) for external communication. Options A, B, and C are incorrect as they do not accurately describe the function of the router in this scenario, nor do they relate directly to the NAT process.