How do you separate voice and data traffic on a company network? Learn why VLANs are the industry standard for isolating voice and data, improving security and performance—essential for Cisco Certified Support Technician (CCST) Networking 100-150 exam success.
Table of Contents
Question
A company wants to separate voice and data traffic on its network. What should be implemented?
A. VLANs
B. STP
C. NAT
D. Port mirroring
E. Subnetting
Answer
A. VLANs
Explanation
VLANs logically separate traffic, allowing voice and data to be managed independently.
To separate voice and data traffic on a network, VLANs (Virtual Local Area Networks) should be implemented.
VLANs allow network administrators to logically segment network traffic, ensuring that voice (VoIP) and data traffic are carried on separate virtual networks, even over the same physical infrastructure.
By assigning phones to a dedicated voice VLAN and computers to a data VLAN, each type of traffic is isolated. This prevents broadcast storms or congestion in the data network from affecting voice quality and provides a security boundary to protect sensitive voice communications.
Cisco switches and other enterprise equipment typically support the configuration of both voice and data VLANs on the same port, using commands like switchport voice vlan for phones and switchport access vlan for computers.
VLANs also facilitate the application of Quality of Service (QoS) policies, allowing voice traffic to be prioritized over data traffic for better call quality.
This approach is standard practice in converged networks, where both voice and data share the same physical network infrastructure but require logical separation for optimal performance and security.
VLANs logically separate traffic, allowing voice and data to be managed independently, improving security, performance, and network manageability.
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