Refer to the exhibit. This exhibit shows the NAT configuration for Router A and the output for a ping issued from device 171.68.200.48 and destined to 172.16.47.142. Based on this information, what change must be made to Router A in order for the ping to work?

A.
reload the router

B.
clear the route cache

C.
add a static route

D.
configure IP as classless

E.
load a newer IOS image

Explanation:
The assumption with classful routing is that all of a classful address belongs to one organization. The idea of a component subnet would be any subnet of a classful network. When you look at the routing table it lists the subnets based on the classful networks like this:

Network 192.168.1.0/27 is subnetted 2 subnets
192.168.1.32 ….
192.168.1.64 ….

The 192.168.1.32 and 192.168.1.64 subnets would be the “component subnets” of the 192.168.1.0 network.

So the point is that if you tried to route a packet to 192.168.1.151 it would be dropped even if there was a default route in the routing table. The reason fo this is that the router knows of subnets that belong to the major network (192.168.1.0 in this case), but does not have an entry for the specific subnet.