Question
On the serial interface of a router, an inbound access list is configured to deny all traffic from UDP and TCP ports 21, 23, and 25. All other traffic is permitted. Based on this information, which types of traffic will be allowed through this interface? (Choose threee)

A. SMTP


B. DNS


C. FTP


D. Telnet


E. HTTP


F. POP3
Answers
B, E, F
Explanation:
Since all traffic that is not using the three ports specified is permitted, the correct answers are B, E and F. (DNS port 53, HTTP port 80, POP3 port 110).

Incorrect Answers:


A. SMTP uses port 25, which is prohibited.


C. FTP uses port 21, which is prohibited.


D. Telnet uses port 23, which is prohibited.   Your Comment




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