CCIE系列認(rèn)證CCIE 415Q單項選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

1 For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）

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2 You are the network administrator of a small Layer 2 network with 50 users. Lately， users have been complaining that the network is very slow. While troubleshooting， you notice that the CAM table of your switch is full， although it supports up to 12，000 MAC addresses. How can you solve this issue and prevent it from happening in the future？（）

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3 Two directly connected routers， R1 and R2， are both configured for OSPF graceful restart. R2 is able to switch packets in hardware， but R1 is not. If a network administrator logs on to R2 and performs a system reload， which will be the result？（）

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4 For the following items，what is the mathematical relationship between the committed information rate （CIR）， committed burst （Bc）， and committed rate measurement interval （Tc）？（）

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5 Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on all interfaces in the network to support a new video streaming application. No other multicast configuration was applied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used. What could be a possible cause？（）

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