WhatsthedefaultstratumclockonaCiscorouter，whenyouseethe

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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多项选择题 ThecoreofanetworkhasfourroutersconnectedinasquaredesignwithGigabitEthernetlinksusing/30subnets.Thenetworkisusedtocarryvoicetrafficandotherapplications.Convergencetimeistakingmorethanexpected.WhichthreeactionswouldyoutaketoimproveOSPFconvergencetime？（）

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