A network engineer wants to allow a temporary entry for a remote user with a specific username
and password so that the user can access the entire network over the Internet. Which ACL can be
used?

A.
standard

B.
extended

C.
dynamic

D.
reflexive

Explanation:
We can use a dynamic access list to authenticate a remote user with a specific username and
password. The authentication process is done by the router or a central access server such as a
TACACS+ or RADIUS server. The configuration of dynamic ACL can be read here:
http://www.cisco.com/en/US/tech/tk583/tk822/technologies_tech_note09186a0080094524.shtml