Address whether each defense method listed above (single router, defense-in-depth, and demilitarized zone) is sufficiently different from all others.

Justify the use of defense perimeters in relation to an organization's type, structure, specific needs and size.

Explain whether a DMZ can provide a better defense perimeter against threats than a single, web-facing router?

Are there any special security issues in DMZ methods that are not found in the other defense perimeters?