Refer to the exhibit. Which command can you enter to verify link speed and duplex setting on the interface?
A. router#show ip protocols
B. router#show startup-config
C. router#show line
D. router#show interface gig 0/1
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I believe the answer is B (show startup-config)
because in show interface g0/0/1 we can not see the configuration which we add to the port
You don’t have any guarantee the configuration will be in startup-config, as there is no write or copy statement in the exhibit.
Also, the show interface command details physical layer and MAC sub-layer related statistics like duplex, speed and more, even if they have been changed (just run a packet tracer lab, change the duplex and try this command).