CCIE系列認(rèn)證CCIE系列認(rèn)證綜合練習(xí)單項(xiàng)選擇題每日一練(2019.01.12)

來源：考試資料網(wǎng)

1 Network A has a spanning-tree problem in which the traffic is selecting a longer path. How is the path cost calculated？（）

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2 A request arrived on your MPLS-vpn-bgp group. Due to a security breach，your customer is experiencing DoS attacks coming from specific subnets （200.0.10.0/24， 200.0.12.0/24）. You have checked all MPLS-EBGP routes being advertised to BHK from other VPN sites and found four subnets listed：200.0.10.0/24，200.0.11.0/24，200.0.12.0/24，200.0.13.0/24. You immediately apply an outbound ACL filter using the appropriate MPLS-EBGP tool： access-list 1 deny 0.0.0.0 255.255.254.255 access-list 1 permit any What happens when you apply this ACL on the MPLS-EBGP connection to BHK？（）

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3 Which of these statements about PIM join messages in classic PIM-SM is correct？（）

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4 What s the default stratum clock on a Cisco router， when you see the key word "master" configured on the NTP line？（）

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5 Which IPv6 address would you ping to determine if OSPFv3 is able to send and receive unicast packets across a link？（）

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