Exam 200-120 | Question id=87 | LAN Switching Technologies |
switch#show spanning-tree interface gigabitEthernet 0/1
Vlan Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0001 Root FWD 4 128.25 P2p
VLAN0099 Alnt BLK 4 128.25 P2p
VLAN0110 Root FWD 4 128.25 P2p
Given the output, what is the reason that interface gigabitEthernet 0/1 is not the root port for VLAN 99?
A. |
This switch has more than one interface connected to the root network segment in VLAN 99. | |
B. |
This switch is running RSTP while the elected designated switch is running 802.1d Spanning Tree. | |
C. |
This switch interface has a higher path cost to the root bridge than another in the topology. | |
D. |
This switch has a lower bridge ID for VLAN 99 than the elected designated switch. |
These four parameters are examined in order to make root bridge, root port, designated port. Other switch has lowest Sending Bridge ID or Sending Port ID so vlan 2 is not the root port.
1. A lower Root Bridge ID
2. A lower path cost to the Root
3. A lower Sending Bridge ID
4. A lower Sending Port ID