Implementing Cisco Wireless Network Fundamentals (WIFUND, legacy) — Question 54

The introduction of consumer phones and tablets into enterprise WLANs can have an impact on 802.11a/b/ g/n deployments. The Apple iPhone 4 and iPad 2 are very common examples. Which statement best describes the abilities of these devices?

Answer options

• A. The Apple iPhone 4 and the iPad 2 use 2.4 GHz and 5 GHz. The Apple iPhone 4 uses only one spatial stream and the iPad 2 uses two spatial streams.
• B. The Apple iPhone 4 uses only 2.4 GHz and the iPad 2 only uses 5 GHz. The Apple iPhone 4 uses only one spatial stream and the iPad 2 uses two spatial streams.
• C. The Apple iPhone 4 uses 2.4 GHz and the iPad 2 uses 2.4 GHz or 5 GHz. The Apple iPhone 4 only uses one spatial stream and the iPad 2 uses two spatial streams.
• D. The Apple iPhone 4 uses 2.4 GHz and the iPad 2 uses 2.4 GHz or 5 GHz. The Apple iPhone 4 and the iPad 2 use only one spatial stream.

Correct answer: D

Explanation

The correct answer is D because the Apple iPhone 4 operates on 2.4 GHz and the iPad 2 has the capability to operate on either 2.4 GHz or 5 GHz, with both devices utilizing only one spatial stream. Options A, B, and C incorrectly state the frequency capabilities or the number of spatial streams for one or both devices.