How Can You Manage Videoconferencing Traffic With VLAN Speed Limits?
A small business is deploying new phones, and some of the phones have full HD videoconferencing features. The Chief Information Officer is concerned that the network might not be able to handle the traffic if the traffic reaches a certain threshold. Which of the following can the network engineer configure to help ease these concerns?
Community Votes
77% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
This question tests your ability to differentiate between bandwidth management (VLAN speed limits) and traffic direction (IP helper), with the common trap being to select IP helper because it mentions VoIP.
When adding HD videoconferencing phones, network engineers can address CIO concerns by placing the phones on a VLAN and applying speed limits to prevent traffic from overwhelming the network. The CompTIA community consensus supports configuring a VLAN with bandwidth caps as the practical solution for controlling threshold-related congestion.
The most common incorrect answer is B, an IP helper to direct VoIP traffic. IP helpers only relay DHCP/BOOTP broadcast traffic and are unrelated to bandwidth throttling, so they cannot reduce the risk of network saturation during videoconferencing.
Community Discussion (8 comments)
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Expert Analysis
Why the Answer Is Correct
Option A is the best answer because it directly addresses the CIO's concern about a traffic threshold. By placing videoconferencing phones in a dedicated VLAN and configuring a 100Mbps speed limit, the engineer caps the amount of bandwidth that phone traffic can consume, preventing the network from being saturated. This is a form of bandwidth management, and community commenters note that the question asks about keeping the network running under heavy load, not about improving VoIP performance (Comment 1). VLAN segmentation also isolates videoconferencing traffic, making it easier to apply traffic policies and reduce broadcast overhead (Comment 2).Why the Other Options Are Wrong
Option B, an IP helper, is incorrect because IP helpers relay DHCP and BOOTP broadcasts; they do not control bandwidth or QoS and therefore cannot ease concerns about traffic volume. Option C, a smaller subnet mask, only changes address allocation and has no effect on network throughput or congestion. Option D, full duplex on all user ports, improves bidirectional throughput but does not cap or manage traffic, and most modern ports already negotiate full duplex, so it is not a targeted response to a threshold concern.Community Comment Notes
The majority of commenters (votes: A=71, B=21) support A, with several explaining that speed limits are about protecting overall network stability rather than maximizing VoIP quality (Comments 1, 2, 3, 4). Some comments mistakenly chose B by referencing ChatGPT advice (Comment 5), but IP helper is not relevant for traffic management. Comment 7 suggests full duplex, but that option only increases per-port capacity and does not prevent a specific traffic threshold from being exceeded.Official Reference
Exam Strategy
When you see 'traffic threshold' or 'network cannot handle traffic,' focus on options that limit or segment traffic, such as VLAN speed limits or QoS. Avoid choosing features like IP helper or full duplex that improve functionality or throughput but do not cap traffic volume, and remember that the exam tests the engineer's ability to prevent congestion before it happens.
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