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Which of the following is a legacy standard for Spanning-Tree Protocol?
802.1Q
802.1S
802.1D
802.1W
The specification of the legacy Spanning-Tree Protocol is IEEE 802.1D. STP ensures a loop-free network with redundant paths. The key to STP operation is the root bridge elected by all switches in a broadcast domain (VLAN). The root bridge is the central point of decisions in the network such as which port to block and which port is in forwarding mode. 802.1S is the IEEE standard for Multiple Spanning-Tree or MST. 802.1W is the IEEE standard for Rapid Spanning-Tree Protocol (RSTP), which is the enhanced version of the legacy STP. 802.1Q is a trunking protocol used for InterVLAN communication.
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