Networking - Security - Discussion

Discussion :: Security - Security (Q.No.15)

15. 

Which of the following access lists will allow only HTTP traffic into network 196.15.7.0?

[A]. access-list 100 permit tcp any 196.15.7.0 0.0.0.255 eq www
[B]. access-list 10 deny tcp any 196.15.7.0 eq www
[C]. access-list 100 permit 196.15.7.0 0.0.0.255 eq www
[D]. access-list 110 permit ip any 196.15.7.0 0.0.0.255
[E]. access-list 110 permit www 196.15.7.0 0.0.0.255

Answer: Option A

Explanation:

The first thing to check in a question like this is the access-list number. Right away, you can see that the second option is wrong because it is using a standard IP access-list number. The second thing to check is the protocol. If you are filtering by upper-layer protocol, then you must be using either UDP or TCP; this eliminates the fourth option. The third and last answers have the wrong syntax.

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