correct
Jammers: Although they should not be expected in normal networks, jammers are
cheap devices and easily bought online. Their characteristic is a continuous signal
with a high duty cycle across the entire affected band. They may operate in 2.4GHz
or 5GHz. The presence of a jammer signal is reflective of an attack against your network. Many jammers operate in the 2.4GHz band because this band is categorized as
Industrial, Scientific, and Medical (ISM) and can be used by any transmitter (under
some relaxed regulatory conditions). Most of the 5GHz band is not ISM, which makes
it less susceptible to interferences from non-802.11 devices. However, different countries have different rules, and you may see in non-ISM 5GHz channels devices that
were designed for a country where such operation is allowed.
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