CCDE: Cisco Certified Design Expert (Practical) — Question 245

Which function is performed at the access layer of the three-layer hierarchical network design model?

Answer options

• A. fast transport
• B. reliability
• C. fault isolation
• D. redundancy and load balancing
• E. QoS classification and marking boundary

Correct answer: E

Explanation

The correct answer is E because the access layer is responsible for implementing Quality of Service (QoS) features like classification and marking of traffic. Options A, B, C, and D refer to functions that are typically associated with other layers in the network model, such as the distribution or core layers, rather than the access layer.