【正确答案】 B

【答案解析】[解析] 命令show port-security Interface显示交换机端口的端口安全配置和状态，如下面的输出所示：
switch# show port-security interface fastethernet0/1
Port Security: Enabled
Port status: SecureUp
Violation mode: Shutdown
Maximum MAC Addresses: 2
Total MAC Addresses: 2
Configured MAC Addresses: 2
Aging Time: 30 mins
Aging Type: Inactvity
SecureStatic address aging: Enabled
Security Violation count: 0