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Refer to the exhibit. What is the reason that the interface FastEthernet 1/5 is not the root port for VLAN1?
The elected designated switch is running 802.1d while this switch is running 802.1w Spanning Tree.
Switch SW3 has a lower Bridge ID for VLAN1 instance comparing to the elected designated switch.
The interface FastEthernet 1/5 has a higher cost to reach the Root Bridge for this VLAN instance.
This interface is numerically higher than the other connecting the same VLAN.
To determine the root bridge, root port and designated port, the following parameters must be checked and compared within the BPDUs exchanged among switches: 1. The lowest Bridge ID. 2. The lowest path cost to the Root Bridge. 3. The lowest sending Bridge ID. 4. The lowest sending port ID. In this question, other switches in the LAN have lower Bridge ID so interface Fast Ethernet 1/5 is not the root port for VLAN1, in this case is the Discarding port or BKN (Blocking), because it has the lowest patch cost to the Root Bridge.
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