Which three flow-control port states lead to enabled link fl

第1题：

Which of the following are spanning tree port states?（）

• A、Learning
• B、Spanning
• C、Listening
• D、Forwarding
• E、Initializing
• F、Filtering
• G、Permitting

第2题：

Which two statements correctly describe UDLD？ （）

• A、Unidirectional link detection is achieved through monitoring STP BPDUs.
• B、It is recommended that it be enabled globally rather than on an individual port.
• C、When an error is detected， normal mode will disable a port.
• D、It is recommended that it be enabled in normal mode.
• E、It is recommended that it be used with the loop guard feature.

第3题：

第4题：

Which two statements are true about BPDU port-guard and BPDU filtering？（）

• A、BPDU port-guard can be enabled globally， whereas BPDU filtering must be enabled on a per-interface basis.
• B、When globally enabled， BPDU port-guard and BPDU filtering apply only to PortFast enabled ports.
• C、When globally enabled， BPDU port-guard and BPDU filtering apply only to trunking-enabled ports.
• D、When a BPDU is received on a BPDU port-guard enabled port， the interface goes into the err-disabled state.
• E、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the err-disabled state.
• F、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the STP blocking state.

第5题：

Which three BGP states are associated with establishing TCP connectivity?（） (Choose three.)

• A、Idle
• B、Active
• C、Connect
• D、Open Sent
• E、Established

第6题：

Which three flow-control port states lead to enabled link flow control？ （）

• A、 Receive port： Enabled， Transmit port： Enabled
• B、 Receive port： Enabled， Transmit port： Desired
• C、 Receive port： Enabled， Transmit port： Disabled
• D、 Receive port： Disabled， Transmit port： Desired
• E、 Receive port： Desired， Transmit port： Desired

第7题：

Which three circumstances would prevent traceroute from displaying the WAN IP addresses? （）(Choose three)

• A、The WAN link is down.
• B、IPSec is enabled on the WX.
• C、Traceroute is enabled for compression.
• D、The network is configured using static routes.
• E、The local and remote cables are accidentally swapped.

第8题：

Which of the following characteristics describe the BPDU Guard feature（）

• A、ABPDU Guard port should only be configured on ports with PortFast enabled.
• B、BPDU Guard and PortFast should not be enabled on the same port.
• C、BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
• D、ABPDU Guard port receiving a BPDU will go into err-disablestate.
• E、ABPDU Guard port receiving a BPDU will be disabled.
• F、BPDU Guard can be enabled on any switch port.

第9题：

Which two states are the port states when RSTP has converged?（）

• A、blocking
• B、learning
• C、discarding
• D、forwarding
• E、listening

第10题：

Which three port states are used by RSTP 802.1w？（）

• A、Listening
• B、Learning
• C、Forwarding
• D、Blocking
• E、Discarding
• F、Disabled