Which unique characteristics of the Data Center Aggregation layer must be considered by an Enterprise Campus designer?

Question

Options

• ALayer 3 routing between the Access and Aggregation layers facilitates the ability to span VLANs
• B"East-west" server-to-server traffic can travel between aggregation modules by way of the core,
• CLoad balancing, firewall services, and other network services are commonly integrated by the use
• DVirtualization tools allow a cost effective approach for redundancy in the network design by using

• A
  7% (2)
• C
  90% (26)
• D
  3% (1)

Explanation

Answer C is correct. The Data Center Aggregation layer is the canonical insertion point for network services such as server load balancers (SLB), firewalls, SSL offload appliances, and intrusion detection systems. These are integrated via service modules or inline appliances, and the designer must account for their impact on traffic flows, redundancy, and failover. Option A is incorrect because Layer 3 routing between Access and Aggregation actually prevents VLAN spanning between access switches - it does not facilitate it. Option B is misleading; east-west server-to-server traffic in a well-designed data center should ideally stay within the aggregation module, not traverse the core. Option D describes a benefit of virtualization generally, but it is not the defining unique characteristic of the Aggregation layer itself.

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