Q6
What command will permit SMTP mail to only host 1.1.1.1?
A.
access-list 10 permit smtp host 1.1.1.1B.
access-list 110 permit ip smtp host 1.1.1.1C.
access-list 10 permit tcp any host 1.1.1.1 eq smtpD.Answer
access-list 110 permit tcp any host 1.1.1.1 eq smtpAnswer: Option D
Solution
Answer: Option D
Solution:
When trying to find the best answer to an access-list question, always check the access-list number and then the protocol. When filtering to an upper-layer protocol, you must use an extended list, numbers 100-199 and 2000-2699. Also, when you filter to an upper-layer protocol, you must use either tcp or udp in the protocol field. If it says ip in the protocol field, you cannot filter to an upper-layer protocol. SMTP uses TCP.