Restricting port access

[Dave Wreski <tel1dvw @ is . ups . com>]

I understand it is important to explicitly define which ports are
acceptable in a firewall, but I don't understand why.  If I have source
and destination IP's defined, does it really make that much difference?

Thanks,
Dave Wreski

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echo '16i[q]sa[ln0=aln100%Pln100/snlbx]sb20293A2058554E494Csnlbxq'|dc