Which two benefits are provided by using a hierarchical addressing network addressing scheme?
(Choose two.)

A.
reduces routing table entries

B.
auto-negotiation of media rates

C.
efficient utilization of MAC addresses

D.
dedicated communications between devices

E.
ease of management and troubleshooting

Explanation:
Here are some of the benefits of hierarchical addressing:
Reference: http://www.ciscopress.com/articles/article.asp?p=174107