300-320 Question #720: Real Exam Question with Answer & Explanation

The correct answer is C: Layer 3. Layer 3 links between the distribution and access layers are required to support load sharing when each access switch has its own dedicated VLANs. With Layer 3 routed links, routing protocols (such as EIGRP or OSPF with ECMP) can load-balance traffic across multiple uplinks simul

Question

An engineer is designing a campus network with dedicated VLANs per access layer switch and wants to ensure that load sharing is supported. Which type of distribution to access link must be implemented to accomplish this configuration?

Options

Ashared
Bspanned
CLayer 3
DLayer 2

Explanation

Layer 3 links between the distribution and access layers are required to support load sharing when each access switch has its own dedicated VLANs. With Layer 3 routed links, routing protocols (such as EIGRP or OSPF with ECMP) can load-balance traffic across multiple uplinks simultaneously. Layer 2 links (D) would require Spanning Tree Protocol, which blocks redundant paths to prevent loops, preventing true load sharing. 'Spanned' (B) VLANs extend across multiple switches and require Layer 2 connectivity, reintroducing STP blocking. Layer 3 access design is also the Cisco recommended approach for scalable campus networks.

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