Discussion :: Computer Networking
- You want to create a standard access list that denies the subnet of the following host: 172.16.144.17/21. Which of the following would you start your list with?
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A.
access-list 10 deny 172.16.48.0 255.255.240.0 |
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B.
access-list 10 deny 172.16.144.0 0.0.7.255 |
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C.
access-list 10 deny 172.16.64.0 0.0.31.255 |
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D.
access-list 10 deny 172.16.136.0 0.0.15.255 |
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Answer : Option B
Explanation :
First, you must know that a /21 is 255.255.248.0, which is a block size of 8 in the third octet. Counting by eight, this makes our subnet 144 in the third octet, and the wildcard for the third octet would be 7 since the wildcard is always one less than the block size.
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