单项选择题
What s the default stratum clock on a Cisco router，when you see the key word "master" configured on the NTP line？（）
A.1
B.2
C.4
D.6
E.8
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QOS的3种基本实施过程？ -
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多项选择题
ThecoreofanetworkhasfourroutersconnectedinasquaredesignwithGigabitEthernetlinksusing/30subnets.Thenetworkisusedtocarryvoicetrafficandotherapplications.Convergencetimeistakingmorethanexpected.WhichthreeactionswouldyoutaketoimproveOSPFconvergencetime？（）
A.Increase MTU of the interfaces to accommodate larger OSPF packets.
B.Change the network type to point-to-point on those links.
C.Reduce SPF initial timer.
D.Increase hello interval to avoid adjacency flapping.
E.Enable OSPF
