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Which of the following is a defined MAC bridge?
802.1D
802.3
None of these
802.1 X
802.1D is the IEEE MAC Bridges standard which includes Bridging, Spanning Tree and others. It is standardized by the IEEE 802.1 working group. It includes details specific to linking many of the other 802 projects including the widely deployed 802.3 (Ethernet), 802.11 (Wireless LAN) and 802.16 (WiMax) standards. https://en.wikipedia.org/wiki/IEEE_802.1D
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