This tells the list to deny any packets from host 172.16.30.2. The default parameter is
Host In other words, if you type access-list 10 deny 172.16.30.2 , the router assumes you that
mean host 172.16.30.2.
//But there’s another way to specify either a particular host or a range of hosts—you can use
wildcard masking. In fact, to specify any range of hosts, you have to use wildcard masking in the
access list.