СТРУКТУРА MAC-АДРЕСА @Сетевой архитектор

Сетевой архитектор | United States America (US)

Create: 2025-04-02 Update: 2025-07-05 16:52:34

СТРУКТУРА MAC-АДРЕСА

Любой MAC-адрес делится на две части:
* идентификатор производителя (3 байта);
* идентификатор адаптера у конкретного производителя (3 байта).

Особый интерес представляют нулевой и первый биты первого байта в идентификаторе производителя. Каждый из этих битов может иметь два значения: 0 и 1.

Нулевой бит:
0 = адрес является одноадресным,
1 = адрес является многоадресным.

Первый бит:
0 = адрес является глобальным,
1 = адрес является локальным.

Глобальный MAC-адрес – это адрес, который может быть назначен сетевому интерфейсу на заводе. Локальный MAC-адрес – это адрес, который может быть назначен администратором сети в случае, если ему надо использовать собственную адресацию. В общем, это что-то вроде "белой" и "серой" адресации.

Итак, сетевому интерфейсу на заводе может быть назначен только MAC-адрес, который одновременно является и одноадресным, и глобальным. То есть и нулевой, и первый биты должны быть равны нулю. В приведенном выше тесте под это условие попадают только два MAC-адреса: 3C-7C-3F-F5-7F-6E и 74-4D-28-29-1A-95.

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ИП Скоромнов Дмитрий Анатольевич, ИНН 331403723315

Сетевой архитектор

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СТРУКТУРА MAC-АДРЕСА