Although there is no line 30 with a deny any on R1, it is implied. You may wish to emphasize this to
your students. Having them actually configure the deny any ACE is a good practice and reinforces
the concept as it shows up in the ACL when issuing a show access-lists command. It is easy to
forget the implicit deny any when troubleshooting ACLs. This could easily result in traffic being
denied that should have been allowed in