www.quorus.ru/technical/cisco/inter/glava06.htm
www.kazteach.com/html/intro._to_networking.htm
www.microsens.de/uk/produkty/media_5.html
www.geometry.net/Math_Help_Desk/Converters.htm
wwwkoi.quorus.ru/technical/cisco/inter/glava06.htm
www.cis.ohio-state.edu/htbin/rfc/rfc1231.html
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