Which statement is true of the functionality of the layers in the hierarchical network model?

Which statement is true of the functionality of the layers in the hierarchical network model?

• The purpose of the access layer is to provide very high bandwidth communications between network devices.
• Most security screening to prevent unauthorized entry to the network happens at the core layer.
• Untrusted external connections are segmented from the rest of the network at all three levels.
• The distribution layer aggregates WAN connections at the edge of the campus.

Exam with this question: CCNA Exploration 4: EWAN Chapter 1 Exam