access list standard or extended

Does an access list (standard or extended) need to be assigned on an interface, or can it work "globally" if you create the ACL?  I've seen it on a lot of configs where I work, but I don't see it applied on an interface.
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Don JohnstonInstructorCommented:
Correct, it has to be applied somewhere. Not necessarily on an interface (i.e. it's used in a routing distribute list).

It is not unusual to see old ACL's on routers.  When I modify an ACL, I do it by creating a new one based on the existing ACL and use a different name (or number).  That way, I can quickly roll back should something go sideways.   I usually document it with a note to delete after some period of time (anywhere from 1 week to 6 months).  But sometimes I forget.

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Ian ArakelNetwork Lead: Data and SecurityCommented:
Hi There,

The access-lists can be used in route maps, distribute list, NATting etc.
For cleanup sakes, a quarterly review to identify the  in use access-list would be recommended.
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