Discussion :: Computer Networking
- What command will permit SMTP mail to only host 1.1.1.1?
|
A.
access-list 10 permit smtp host 1.1.1.1 |
|
B.
access-list 110 permit ip smtp host 1.1.1.1 |
|
C.
access-list 10 permit tcp any host 1.1.1.1 eq smtp |
|
D.
access-list 110 permit tcp any host 1.1.1.1 eq smtp |
Whatsapp
Facebook
Answer : Option D
Explanation :
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.
Be The First To Comment