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To configure the IP address 172.16.50.1/20 on an interface of router "R1", which IOS command, is issued at the command line?

R1(config-if)# ip address 172.16.50.1 255.255.224.0

R1(config-if)# ip address 172.16.50.1/20

R1(config)# ip address 172.16.50.1 255.255.0.0

R1(config)# ip address 172.16.50.1 255.255.240.0

R1(config-if)# ip address 172.16.50.1 255.255.255.240

R1(config-if)# ip address 172.16.50.1 255.255.240.0

Explanation

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