200-101 Question #141: Real Exam Question with Answer & Explanation

Question

Options

• AA higher level of network security can be reached by separating sensitive data traffic from other network traffic.
• BA more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure.
• CA more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.
• DBroadcast storms can be mitigated by increasing the number of broadcast domains, thus reducing their size.

Explanation

VLANs provide three key benefits captured by choices A, B, and C. (A) Security: Sensitive traffic (e.g., finance, HR) is logically isolated from general user traffic, reducing the risk of eavesdropping even on shared physical infrastructure. (B) Efficiency for physical groups: Multiple physical workgroups (e.g., departments on different floors) can share the same switches and cabling rather than requiring separate physical networks. (C) Efficiency for logical networks: Multiple logical networks can coexist on the same physical infrastructure, reducing hardware and cabling costs. Choice D is excluded because while VLANs do create additional broadcast domains (reducing their individual size), the statement in D conflates cause and effect in a way that is less precise - the primary stated benefits in standard Cisco curriculum focus on security, physical efficiency, and logical efficiency.

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