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Which answers list an IP address/prefix length that would cause the router to enable EIGRP on Fa0/0?

A router has been configured with the commands router eigrp 9 and network
172.16.1.0 0.0.0.255. No other EIGRP-related commands have been configured. The
answers list the IP addresses that could be assigned to this router’s Fa0/0 interface. Which
answers list an IP address/prefix length that would cause the router to enable EIGRP on
Fa0/0?

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A.
172.16.0.1/23

B.
172.16.1.1/26

C.
172.16.1.1/24

D.
172.16.0.255/23

E.
None of the other answers is correct.

Explanation:
The network 172.16.1.0 0.0.0.255 command tells IOS to match the first
three octets when comparing the interface IP addresses to the configured “172.16.1.0”
value. Only two answers match in the first three octets. The other two answers have a
0 in the 3rd octet, making the addresses not match the network command.


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