An engineer must design a new data center network and must reduce hardware costs while allowing for the benefits of a hierarchical network model. Which layer is combined with the distribution layer by a single device to accomplish this goal?
A. campus
B. access
C. DMZ
D. core
D !
collapsed core design ist sill hierachical, no word from 3-tier
Looks “C” is the correct one
The three-tier hierarchical design maximizes performance, network availability, and the ability to scale the network design.
However, many small enterprise networks do not grow significantly larger over time. Therefore, a two-tier hierarchical design where the core and distribution layers are collapsed into one layer is often more practical. A “collapsed core” is when the distribution layer and core layer functions are implemented by a single device. The primary motivation for the collapsed core design is reducing network cost, while maintaining most of the benefits of the three-tier hierarchical model.
Ref: http://www.ciscopress.com/articles/article.asp?p=2202410&seqNum=4
you mean D- Core not C- DMZ.
the correct answer is D