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A network switch is a multiport network bridge that uses MAC addresses to forward data at the data link layer (layer 2) of the OSI model. Some switches can also forward data at the network layer (layer 3) by additionally incorporating routing functionality. Such switches are commonly known as layer-3 switches or multilayer switches. [2]
Many luminous blue variables also show small amplitude variability with periods less than a year, which appears typical of Alpha Cygni variables, [7] and stochastic (i.e. totally random) variations. [8] Luminous blue variables are by definition more luminous than most stars and also more massive, but within a very wide range.
It is still around 25 times more luminous than the Sun. [18] The closest large neighbouring star to Sirius is Procyon, 1.61 parsecs (5.24 ly) away. [82] The Voyager 2 spacecraft, launched in 1977 to study the four giant planets in the Solar System, is expected to pass within 4.3 light-years (1.3 pc) of Sirius in approximately 296,000 years. [83]
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