問答題what is URPF？

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1.多項選擇題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

4.單項選擇題Unicast Reverse Path Forwarding can perform all of these actions except which one？（）

A.examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
B.check to see if any packet received at a router interface arrives on the best return path
C.combine with a configured ACL
D.log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
E.inspect IP packets encapsulated in tunnels， such as GRE

5.單項選擇題Which of these statements accurately identifies how Unicast Reverse Path Forwarding can be employed to prevent the use of malformed or forged IP sources addresses？（）

A.It is applied only on the input interface of a router.
B.It is applied only on the output interface of a router.
C.It can be configured either on the input or output interface of a router.
D.It cannot be configured on a router interface.
E.It is configured under any routing protocol process.