在对segment的port进行设置时，光接口既可以工作在1000M全双工模式下，也能手动指定为10M/100M半双工模式。（）
在对segment的port进行设置时，光接口既可以工作在1000M全双工模式下，也能手动指定为10M/100M半双工模式。（）
相关考题：
8251A是可编程的串行通信接口芯片,通过编程能将工作方式设置为()。 A.只能工作在同步方式B.只能工作在异步方式C.既可以工作在同步方式，也可以工作在异步方式D.既不能工作在同步方式，又不能工作在异步方式
在配置802.1x认证时,可以配置接口接入的最大用户数量,如果在接口下配置dot1x port－method命令,指定认证方式为基于接口(port)对接入用户进行认证,接口的最大接入用户数为1。此时()。 A.可以继续执行dot1x max-user命令修改最大接入用户数B.不能立即执行dot1x max-user命令配置最大接入用户数C.需要undo dot1x port-method，然后才能进行最大用户数的配置D.上述都正确
当发现两台Quidway交换机之间10/100自适应以太网接口双工速率不匹配时，我们应该执行如下哪些操作（）。A、在对应接口用speed100命令强制指定接口速率为100Mb/s。B、在对应接口用duplexfull命令强制指定接口为全双工。C、通过shutdown和undoshutdown命令重启接口使得配置生效。D、通过displayinterface命令查看对应接口状态是否正确，如果正确使用save命令保存配置。
S-16.1表示的意思为（）。A、工作在G.652光纤的1310nm波长区，传输速率为2.5G的长距离光接口。B、工作在G.652光纤的1550nm波长区，传输速率为2.5G的长距离光接口。C、工作在G.655光纤的1550nm波长区，传输速率为2.5G的短距离光接口。D、工作在G.652光纤的1310nm波长区，传输速率为2.5G的短距离光接口。
根据《宽带光纤接入工程验收规范》，在进行设备功能检查中，对单机检查测试时，测试OLT设备的（）平均发射光功率、接收灵敏度应符合设计要求。A、PON接口B、以太网光接口C、以太网电接口D、STM光接口
Which statement is correct about RSTP port roles？（）A、The designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.B、The disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.C、The backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.D、The root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.
单选题Which statement is correct about RSTP port roles？（）AThe designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.BThe disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.CThe backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.DThe root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.
判断题在光监控通道出现问题时，确有必要检查光接口实际余量时，对其输出/输入功率进行测试，看是否工作在正常范围。A对B错