Which statement about data center access layer design modes is correct?

Question

Options

• AThe access layer is the first oversubscription point in a data center design.
• BThe data center access layer provides the physical-level connections to the server resources and
• CWhen using a Layer 2 looped design, VLANs are not extended into the aggregation layer.
• DWhen using a Layer 3 design, stateful services requiring Layer 2 connectivity are provisioned

• A
  80% (43)
• B
  4% (2)
• C
  9% (5)
• D
  7% (4)

Explanation

The access layer is indeed the first oversubscription point in a data center design. Servers connect to access layer switches with dedicated bandwidth (e.g., 1 Gbps or 10 Gbps NICs), but the uplinks from the access layer to the aggregation layer aggregate that bandwidth at a ratio - meaning more bandwidth enters from servers than exits upward. This is the intentional and first point of oversubscription. Option B is partially true but the statement is truncated and incomplete. Option C is incorrect - in a Layer 2 looped design (using STP), VLANs ARE extended into the aggregation layer. Option D is incorrect - in a Layer 3 access design, stateful services requiring Layer 2 connectivity are typically not directly provisioned at the access tier in the way the answer implies; they require special design accommodations.

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