70-640 Week 9 Q&A Answer
What are RODC and why are they more secure?
Answer:
RODC = Read-Only Domain Controllers
RODC maintains a small number of cache user accounts and therefore if compromised the affect is limited to those account only.
Read the complete post at http://smsug.ca/blogs/garth_jones/archive/2008/08/01/70-640-week-9-q-amp-a-answer.aspx