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Which command would you use to apply an access list to a router interface?

  • A.ip access-list 101 out
  • B.access-list ip 101 in
  • C.ip access-group 101 in
  • D.access-group ip 101 in

Answer: C

Correct answer: ip access-group 101 in

The list is *created* with access-list in global configuration mode and *applied* with ip access-group in interface configuration mode, naming the list and the direction. Confusing the two commands is the commonest error here, and the direction keyword is not optional - a list applied the wrong way round filters traffic the interface never sees.

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