CompTIA Security+ Question B-98

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
[]——–[INSIDE router OUTSIDE]———[] LOGS
10:30:22, SRC, DST, SYN
10:30:23, SRC, DST, SYN/ACK
10:30:24, SRC, DST, ACK
Given the above information, which of the following can be inferred about the above environment?

A. 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.

Answer: D

Network address translation (NAT) allows you to share a connection to the public Internet via a single interface with a single public IP address. NAT maps the private addresses to the public address. In a typical configuration, a local network uses one of the designated “private” IP address subnets. A router on that network has a private address ( in that address space, and is also connected to the Internet with a “public” address ( assigned by an Internet service provider.