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Which of the following commands permits port 25 traffic to host 10.10.10.2?
access-list 10 permit 25 host 10.10.10.2
access-list 10 permit tcp any host 10.10.10.2 eq 25
access-list 101 permit ip any host 10.10.10.2 eq 25
access-list 101 permit tcp any host 10.10.10.2 eq smtp
Standard access lists use the numbers from 1-99 and 1300-1999. Extended access lists use the numbers from 100-199 and 1100-1199. Only extended ACLs can filter upper layer protocols such as 25 (SMTP). To filter upper layer protocols use the keywords tcp or udp. For more information refer to: http://www.cisco.com/c/en/us/support/docs/security/ios-firewall/23602-confaccesslists.html
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