1721 IOS 12.4 Info for Blocking Closed Unsecured Ports...

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Nov 28th, 2007
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Hello, I just got my router setup for internet access but I am concerned about outside attacks on open ports. I am new to working with security only just finished CCNA classes. I did a port scan on my router and it shows that I have closed but unsecured ports. I want to secure those ports. I was trying to make an ACL for this but It does not work for specific ports. What are my options for blocking ports if any?

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