單項選擇題

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 ports
D. Globally enables all ports on the device for Unidirectional Link Detection （UDLS）
E. None of the other alternatives apply

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單項選擇題

Switch R1 has been configured with the root guard feature.
What statement is true if the spanning tree enhancement Root Guard is enabled？（）

A. If BPDUs are not received on a non-designated port， the port is moved into the STP loop- inconsistent blocked state
B. IF BPDUs are received on a PortFast enabled port， the port is disabled.
C. If superior BPDUs are received on a designated port， the interface is placed into the root- inconsistent blocked state.
D. If inferior BPDUs are received on a root port， all blocked ports become alternate paths to the root bride.

多項選擇題

You are the network administrator tasked with designing a switching solution for the Company network.
Which of the following statements describing trunk links are INCORRECT？（）

A. The trunk link belongs to a specific VLAN.
B. Multiple trunk links are used to connect multiple end user devices.
C. A trunk link only supports native VLAN.
D. Trunk links use 802.10 to identify a VLAN.
E. The native VLAN of the trunk link is the VLAN that the trunk uses for untagged packets.

On switch R1 you issue the "udld enable" global command. What does this command accomplish？ （）

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Switch R1 has been configured with the root guard feature. What statement is true if the spanning tree enhancement Root Guard is enabled？ （）

You are the network administrator tasked with designing a switching solution for the Company network. Which of the following statements describing trunk links are INCORRECT？（）

On switch R1 you issue the "udld enable" global command.
What does this command accomplish？（）

Switch R1 has been configured with the root guard feature.
What statement is true if the spanning tree enhancement Root Guard is enabled？（）

You are the network administrator tasked with designing a switching solution for the Company network.
Which of the following statements describing trunk links are INCORRECT？（）