Which Cisco NAC Appliance design is the most scalable in large Layer 2-to-distribution implementation?

Which Cisco NAC Appliance design is the most scalable in large Layer 2-to-distribution implementation?
A . Layer 2 out-of-band
B . Layer 2 in-band
C . Layer 3 out-of-band
D . Layer 3 in-band

View Answer

Answer: B

Explanation:

https://www.safaribooksonline.com/library/view/foundation-learning-guide/9780132652933/ch08.html

"Layer 2 In-Band Designs

The Layer 2 in-band topology is the most common deployment option.

[…]

This is the most scalable design in large L2-to-distribution environments, because this design can be transparently implemented in the existing network supporting multiple access layer switches. It supports all network infrastructure equipment. The Cisco NAS supports per- user ACLs."