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?
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.
Explanation:
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 (192.168.1.1) in that address space, and
is also connected to the Internet with a “public” address (10.2.2.1) assigned by an Internet service
provider.