300-360 Question #195: Real Exam Question with Answer & Explanation

The correct answer is D: It can cause gaps in the real-time traffic path. When a dual-band SSID is used, a client device may roam between the 2.4 GHz and 5 GHz bands. Each band transition requires the client to disassociate from one radio and reassociate with the other. Even though this handoff is brief, it introduces a gap in the real-time traffic pat

Question

Which design limitation of dual-band WLAN must be considered when end-user devices stream real- time applications and services utilizing dual-band SSID?

Options

AIt can cause packet loss in the real-time path
BIt can cause jitter and degrade overall network throughput
CIt can cause short-term signal loss from collisions
DIt can cause gaps in the real-time traffic path

Explanation

When a dual-band SSID is used, a client device may roam between the 2.4 GHz and 5 GHz bands. Each band transition requires the client to disassociate from one radio and reassociate with the other. Even though this handoff is brief, it introduces a gap in the real-time traffic path (D), which is unacceptable for latency-sensitive streams like voice or video. Unlike jitter (B) or packet loss (A), which imply degraded-but-continuous flow, a band-switch gap is a complete, discrete interruption. Option C (short-term signal loss from collisions) describes a different phenomenon unrelated to dual-band roaming.

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