Most IP addresses are public, in the sense that they can appear on the public Internet. However, a few IP addresses have been designated as private IP addresses. One private IP address range is...

Most IP addresses are public, in the sense that they can appear on the public Internet. However, a few IP addresses have been designated as private IP addresses. One private IP address range is 172.16.0.0 to 172.31.255.255. Private IP addresses can only appear within a firm. In Figure 6-20, internal hosts have private IP addresses except for those in the DMZ, which use public IP addresses. Explain this discrepancy if you can.