Refer to the exhibit． Given the output shown from this Cisco Catalyst 2950, what is the most likely reason that interface FastEthernet 0/10 is not the root port for VLAN 2?

A、 This switch has more than one interface connected to the root network segment in VLAN 2．
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 2 than the elected designated switch．

【正确答案】 C

【答案解析】如图，给出了Cisco交换机2950的输出代码，Fa0/10没有成为Vlan2的根端口最优可能的原因是什么？
考点分析：一个端口要想成为根端口，首先比较根路径成本，越低越可能。题目问为什么没能成为根端口，原因最可能就是根路径成本比其他端口高。