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Refer to the exhibit. What can be concluded about the output of R1s show ip interface brief command?

The interfaces FasthEthernet0/0.10 through 30 are configured as ISL trunks

The subinterfaces on R1 are configured as 802.1q trunks

The interface FastEthernet0/0 must be configured with an IP address, otherwise it will not work

The LAN interface is configured with a single subnet mask

Explanation

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