But if you do "?" you will get only options which are applicable and rest all commands will be disabled so it will be very helpfull.
For example if you go to interface config mode on any router IOS and you do ? you get lot of optiosn which you need not reuiqred but in exam in any simulation when you do ? you see many commands are disabled and only few you can see as highlighted and you can use only thise highligted commands wchih will help you a lot to reduce the doubts of commands.
When did you gave your CCNP exam as when I appeared TAB was not working at all.
In real time enviromenet when you just write 2-3 alphabets for any command on any IOS device and hit TAB it automatically takes the whole command which I do not think is available in CCNA as well as CCNP exam but yes when you do ? you get all the available options.
I want to inform you that I'm wondering about this also before the exam and I thought that TAB and ? will not work but when I tried it in the exam the TAB worked fine and I could see all the options with ?. So be sure it will be there but it is better to not rely on it and prepare your self well by knowing all the commands.
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