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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what is URPF？

多项选择题

The core of a network has four routers connected in a square design with Gigabit Ethernet links using /30 subnets. The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time？（）

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