CCIE系列認證CCIE 415Q單項選擇題每日一練(2019.01.09)

來源：考試資料網(wǎng)

1 You are the network administrator of an enterprise company that just deployed a global IP telephony environment. In order to guarantee good voice quality， you asked your provider to implement QoS on the CE routers of your MPLS network. On your LAN， you have also deployed QoS. Users， however， keep complaining about bad voice quality， and the provider does not see matches on the DSCP values that you have asked him to match upon. What is most likely the problem？（）

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2 Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）

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3 To troubleshoot network issues more accurately， milliseconds should be included in the syslog of the router. Which command will achieve this？（）

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4 Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports？（）

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5 An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each， terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs， and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue. What action will likely fix this problem？（）

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