medium
Single Answer
0Denis is troubleshooting a network and discovers that the NAT router he is connected to has the 192.168.x.x subnet as its internal network and that its external IP is 192.168.1.40. What problem is he encountering?
Answer Options
A
192.168.x.x is a nonroutable network and will not be carried to the Internet.
B
192.168.1.40 is not a valid address because it is reserved by RFC 1918.
C
Double NATing is not possible using the same IP range.
D
The upstream system is unable to de-encapsulate his packets, and he needs to use PAT instead.
Correct Answer: C
Explanation
Double NATing isn't possible with the same IP range; the same IP addresses cannot appear inside and outside a NAT router. RFC 1918 addresses are reserved, but only so they are not used and routable on the Internet, and changing to PAT would not fix the issue.