Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

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In the context of the Law of Zero, what does a comparison of two signals at the same absolute power level yield?

A positive dB value

A negative dB value

0 dB

The Law of Zero states that when two signals are compared at the same absolute power level, the result of this comparison is expressed in decibels (dB) as 0 dB. This is because the decibel scale is a logarithmic measure of the ratio of two quantities, often power or intensity. When the two signals are equal in power, their ratio is 1, and the logarithm of 1 is always 0. Therefore, when comparing identical power levels, the output is 0 dB, indicating no gain or loss in signal strength between the two.

Other options suggest different outcomes that would arise from a mismatch in power levels. A positive dB value would indicate that one signal is stronger than the other, and a negative dB value would suggest the opposite, demonstrating a loss in power. A measure of intensity does not specifically quantify the comparison in the dB context, making it less relevant to the Law of Zero. The focus on 0 dB captures the essence of equal power comparison accurately.

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A measure of intensity

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