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在启用UDLD的情况下，交换机将定期的向邻居发送UDLD协议数据包，并且期望在预定计时器到期之前接收到回应的数据包。经过多少秒后，交换机将决定链路是单向链路，并且关闭掉该端口。（）
- A、10秒
- B、20秒
- C、15秒
- D、25秒
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在启用UDLD的情况下,交换机将定期的向邻居发送UDLD协议数据包,并且期望在预定计时器到期之前接收到回应的数据包。经过多少秒后,交换机将决定链路是单向链路,并且关闭掉该端口。()
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Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）A、Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.B、UDLD protects against STP failures caused by cabling problems that create one-way links.C、Loop guard detects and protects against duplicate packets being received and transmitted on different ports.D、UDLD protects against unidirectional cabling problems on copper and fiber media.E、Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
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考题
单选题On switch R1 you issue the "udld enable" global command. What does this command accomplish？ （）A
Enables all fiber-optic LAN ports for Unidirectional LINK Detection （UDLD）B
Enables all copper media LAN ports Unidirectional Link Detection （UDLD）C
Overrides the default UDLS setting for all portsD
Globally enables all ports on the device for Unidirectional Link Detection （UDLS）E
None of the other alternatives apply
考题
单选题在启用UDLD的情况下，交换机将定期的向邻居发送UDLD协议数据包，并且期望在预定计时器到期之前接收到回应的数据包。经过多少秒后，交换机将决定链路是单向链路，并且关闭掉该端口。（）A
10秒B
20秒C
15秒D
25秒
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