思科认证：CCNA认证考前精选模拟试题4
思科知识的学习在一定基础上还是有些难度，为了帮助考生们复习好《思科认证：CCNA认证学科》，我们考吧网整理了思科认证模拟试题，本次汇编的模拟试题希望对你的考试有所帮助，预祝你考试顺利。
1. 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: BD
2. Refer to the exhibit. Router E learned about the PIM RP (designated as 7.7.7.7) from four different sources. Routers A and D advertised the 7.0.0.0 network via EIGRP. Routers B and C advertised the 7.0.0.0 network via OSPF. Considering that all four Ethernet interfaces on router E could potentially lead back to the PIM-RP, when router E receives the first multicast packet down the shared tree, which incoming interface will be used to successfully pass the RPF check?
如图所示，路由器E从不同渠道学习7.7.7.7的的路由。路由器A和D在EIGRP中通告的7.0.0.0 的路由，路由器B和C在OSPF中通告的7.0.0.0的路由。考虑到4个网口都能连接到PIM-RP。 当路由器E收到第一个多播包在共享树。哪个接口能在入方向通过RPF检查?(答案可能有不准)
A. E0 B. E1 C. E2 D. E3 E. None of these interfaces will be used to successfully pass the RPF check. F. All of these interfaces would successfully pass the RPF check.
Answer: A
3. 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: C
4. 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
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