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The site had the following in the homepage, "How to Use Cisco IOS Access Lists." I noticed that the web site stated " Remember that an Access-List ACL is used to specify network traffic." They also stated " Once you specify traffic with an ACL, you can then do a variety of things with it. For example, you could allow it, deny it, limit it, or use it to restrict routing updates. We will also explain how to filter traffic with an ACL because this is the most common use. Example of Filtering with an Access-list. First, create your access-list. And show ip interface serial0."