300-360 Question #220: Real Exam Question with Answer & Explanation

The correct answer is B: 4 dB. Standard RF propagation tables used in wireless site surveys assign approximately 4 dB of signal attenuation for a single cinder block (concrete masonry unit) wall. This is a commonly tested value in Cisco wireless certifications. For reference, typical attenuation values include

Question

What is the attenuation of a wireless signal that passes through a cider block wall?

Options

A3 dB
B4 dB
C6 dB
D12 dB

Explanation

Standard RF propagation tables used in wireless site surveys assign approximately 4 dB of signal attenuation for a single cinder block (concrete masonry unit) wall. This is a commonly tested value in Cisco wireless certifications. For reference, typical attenuation values include: drywall/interior partitions (~3 dB), cinder block (~4 dB), glass with metal frame (~6 dB), and reinforced concrete (~12–15 dB). Understanding these values is essential during pre-survey planning and path-loss calculations to predict coverage before physically deploying APs.

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