A company wants to consolidate multiple physically separate Fibre Channel SANs into one switch infrastructure while keeping each SAN's traffic isolated. Which technology best achieves this?
VSANs create isolated logical fabrics over a physical infrastructure.
Why this answer
VSANs (Virtual SANs) allow multiple physically separate Fibre Channel SANs to be consolidated onto a single switch infrastructure by creating isolated virtual fabrics. Each VSAN maintains its own fabric services, such as name server and zone server, ensuring traffic isolation without requiring separate physical switches or cabling.
Exam trap
Cisco often tests the misconception that zoning alone provides the same isolation as VSANs, but zoning only controls device access within a single fabric, whereas VSANs provide complete fabric-level separation including separate control planes and fabric services.
How to eliminate wrong answers
Option A is wrong because reducing the number of switches by using a single director does not inherently isolate traffic; it simply consolidates hardware without providing logical separation. Option C is wrong because using a single VSAN with extensive zoning only controls which devices can communicate, but all traffic still shares the same fabric services and control plane, which can lead to instability and security risks. Option D is wrong because deploying separate physical cabling for each SAN defeats the purpose of consolidation and increases cost and complexity, whereas VSANs achieve isolation logically.