Which two statements about route summarization are true? (Choose two.)
A. EIGRP can summarize routes at the classful network boundary
B. EIGRP and RIPv2 route summarize are configured with the ip summary-address command under the route.
C. It can be disabled in RIP, RIPv2 and EIGRP
D. It require a common set of high-order bits for all component routes
E. RIPv2 can summarize-routes beyond the classful network boundary
RIPv2 does support summaries and the use of non-classful masks, however, you cannot summarize beyond the classful boundary. So you cannot summarize 10.0.0.0 254.0.0.0, or 200.4.0.0 255.192.0.0 with RIPv2, so it’s not completely classless.
I can see A and D being true, though I’m not sure why E is incorrect?
A & D are definitely correct, but E is correct as well:
“Classless routing protocols (such as RIPv2, OSPF, IS-IS, and EIGRP) support route summarization based on subnet addresses, including VLSM addressing. ”
http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=3