FC0-U71 Infrastructure Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Wi-Fi 6

  Why this is correct

  Wi-Fi 6 (802.11ax) introduces OFDMA and MU-MIMO improvements that raise throughput and efficiency in dense, congested environments, unlike Wi-Fi 5 (802.11ac). Selecting it satisfies the stem's requirement for faster speeds and better performance under congestion, particularly where many devices share the same access point.

• ✗

  Neither affects speed

  Why it's wrong here

  Wi-Fi 6 (802.11ax) raises throughput via 1024-QAM and OFDMA subcarrier scheduling, so the standard chosen directly affects speed; Wi-Fi 5 caps at 256-QAM without OFDMA. Denying any speed impact contradicts these PHY and MAC differences. The claim would apply only if the two standards used identical modulation and channel-access mechanisms.

• ✗

  Both are identical in speed

  Why it's wrong here

  Wi-Fi 6 (802.11ax) delivers higher throughput through 1024-QAM and OFDMA, which schedules multiple users per channel, improving congested-environment performance; Wi-Fi 5 lacks OFDMA and uses 256-QAM. Claiming identical speed ignores these modulation and scheduling differences. The statement would hold only if both standards shared the same PHY and MAC capabilities.

• ✗

  Wi-Fi 5

  Why it's wrong here

  Wi-Fi 5 (802.11ac) uses 256-QAM and OFDM, lacking OFDMA and 1024-QAM, so it delivers lower throughput and handles congestion less effectively than Wi-Fi 6 (802.11ax). Wi-Fi 5 is the right pick only when client devices support nothing newer and cost or compatibility outweighs performance.

Go deeper

Related to this question