352-001 · Question #731
Which function is performed at the access layer of the three-layer hierarchical network design mode?
The correct answer is D. QoS classification and marking boundary. In the three-layer hierarchical model (Core, Distribution, Access), each layer has distinct roles. The access layer connects end-user devices to the network and serves as the QoS trust boundary - the point where traffic should be classified and marked (DSCP/CoS) as it first enter
Question
Which function is performed at the access layer of the three-layer hierarchical network design mode?
Options
- Afast transport
- Breliability
- Credundancy and load balancing
- DQoS classification and marking boundary
- Efault isolation
How the community answered
(52 responses)- A4% (2)
- C2% (1)
- D94% (49)
Explanation
In the three-layer hierarchical model (Core, Distribution, Access), each layer has distinct roles. The access layer connects end-user devices to the network and serves as the QoS trust boundary - the point where traffic should be classified and marked (DSCP/CoS) as it first enters the network infrastructure. Marking at ingress ensures correct treatment throughout the rest of the network. The core layer provides fast transport (high-speed, low-latency backbone). The distribution layer handles redundancy, load balancing, policy enforcement, and fault isolation between the core and access layers. Access-layer QoS marking is a best-practice design principle because it is closest to the traffic source.
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