Which router command will configure an interface with the IP address 10.10.80.1/19?
A.
router(config-if)# ip address 10.10.80.1/19
B.
router(config-if)# ip address 10.10.80.1 255.255.0.0
C.
router(config-if)# ip address 10.10.80.1 255.255.255.0
D.
router(config-if)# ip address 10.10.80.1 255.255.224.0
E.
router(config-if)# ip address 10.10.80.1 255.255.240.0
F.
router(config-if)# ip address 10.10.80.1 255.255.255.240
Explanation:
255.255.224 equal /19 in CIDR format hence the answer
Convert the CIDR 19 to a subnet mask of 255.255.255.240
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/19 converted to dotted decimal is 255.255.224.0
Therefore, only answer D is correct
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D
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