When using Rapid PVST+, which command guarantees the switch is always the root bridge for VLAN 200?
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A. B. C. D.B.
Rapid Per-VLAN Spanning Tree (RPVST+) is an IEEE standard protocol that allows for multiple spanning trees to coexist on a single physical switch. It provides a separate instance of the Spanning Tree Protocol (STP) for each VLAN, which increases network stability and reduces convergence times.
When using RPVST+, the root bridge is the most important switch in the network, as it is responsible for sending and receiving all traffic. By default, the root bridge is elected based on the switch with the lowest Bridge ID (BID). The BID is a combination of the switch's priority value and its MAC address.
To guarantee that a switch is always the root bridge for a particular VLAN, you need to configure its priority value to be lower than all other switches in the network. The lower the priority value, the higher the switch's chances of becoming the root bridge. You can do this using the "spanning-tree vlan [vlan-id] priority [priority-value]" command.
Now, looking at the answer options:
A. "spanning-tree vlan 200 priority 614440": This command sets the priority value for VLAN 200 to 614440, which is a relatively high value. This means that the switch that has this configuration is less likely to become the root bridge for VLAN 200.
B. "spanning-tree vlan 200 priority 0": This command sets the priority value for VLAN 200 to 0, which is the lowest possible value. This means that the switch that has this configuration is guaranteed to become the root bridge for VLAN 200.
C. "spanning-tree vlan 200 root primary": This command forces the switch to become the root bridge for VLAN 200 by setting its priority value to 0 and the MAC address to the lowest possible value. This means that the switch that has this configuration is guaranteed to become the root bridge for VLAN 200.
D. "spanning-tree vlan 200 priority 38813258": This command sets the priority value for VLAN 200 to a relatively high value, which means that the switch that has this configuration is less likely to become the root bridge for VLAN 200.
Therefore, the correct answer to the question is B. "spanning-tree vlan 200 priority 0" guarantees that the switch is always the root bridge for VLAN 200.