單項(xiàng)選擇題Spanning Tree Protocol calculates path cost based on which of these？（）

A.interface bandwidth
B.interface delay
C.interface bandwidth and delay
D.hop count
E.bridge priority


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2.單項(xiàng)選擇題Which standard supports multiple instances of spanning tree？（）

A.802.1D
B.802.1s
C.802.1w
D.802.1z

3.多項(xiàng)選擇題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.

5.單項(xiàng)選擇題

Refer to the exhibit. Catalyst R is the root bridge for both VLAN 1 and VLAN 2. What is the easiest way to load-share traffic across both trunks and maintain redundancy in case a link fails，without using any type of EtherChannel link-bundling？ （）

A.Increase the root bridge priority （increasing the numerical priority number） for VLAN 2 on Catalyst D so that port D2 becomes the root port on Catalyst D for VLAN 2
B.Decrease the port priority on R2 for VLAN 2 on Catalyst R so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1
C.Decrease the path cost on R2 on Catalyst R for VLAN 2 so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1
D.Increase the root bridge priority （decreasing the numerical priority number） for VLAN 2 onCatalyst R so that R2 becomes the root port on Catalyst D for VLAN 2