1. Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these?
哪个是生成树协议802.1s的定义。?
A. one global STP instance for all VLANs
B. one STP instance for each VLAN
C. one STP instance per set of VLANs
D. one STP instance per set of bridges Answer:
答案：C考试用书
2. Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D? (Choose two.)
在生成树协议802.1D中，选择根桥需要用到那两个参数?
A. Designated Root Cost
B. bridge ID priority
C. max age
D. bridge ID MAC address
E. Designated Root Priority
F. forward delay Answer:
答案BD
3. If a port configured with STP loop guard stops receiving BPDUs, the port will be put into which state?
网桥的优先级 网桥的MAC地址
在STP中一个接口停止接收BPDU信息了，那么这个接口是什么状态?
A. learning state B. listening state C. forwarding state D. root-inconsistent state
Answer: D
4. What is the purpose of the STP PortFast BPDU guard feature?
根状态发生了改变
什么是生成树开启PortFast BPDU保护功能的目的
A. enforce the placement of the root bridge in the network B. ensure that a port is transitioned to a forwarding state quickly if a BPDU is received C. enforce the borders of an STP domain
Answer: C
5. When STP UplinkFast is enabled on a switch utilizing the default bridge priority, what will the new bridge priority be changed to?
配置了生成树域的边界
D. ensure that any BPDUs received are forwarded into the STP domain
当STP的uplink Fast端口上使用了一个默认优先级的交换机， 这个交换机的优先级将变成什 么?
A. 8192 B. 16384 C. 49152 D. 65535
Answer: C
