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Which of the following TCP services will be denied access as an effect of the command "access-list 100 deny tcp host 192.168.1.2 host 18.104.22.168 eq 25"?
The command "access-list 100 deny tcp host 192.168.1.2 host 22.214.171.124 eq 25" is used to deny TCP service that uses port 25. This port number is used by SMTP or Simple Mail Transfer Protocol. FTP or File Transfer Protocol uses port numbers 20 (Data) and 21 (Command). DNS or Domain Name Service/System uses port 53. ICMP or Internet Control Message Protocol, however, is a messaging protocol at the network layer, not in the transport layer. ICMP use different types of messages. As an example, you can use "echo-reply" or "echo-request", etc., instead of using port numbers.
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