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Which of the following wildcard mask matches all IP packets in subnet 10.10.20.0 /23?
0.0.0.255
0.0.0.31
0.0.1.255
0.0.255.255
0.0.7.255
The subnet mask /23 represents 255.255.254.0. The wildcard mask is the inverse representation of the subnet mask, so 255-255=0 and 255-254=1 therefore the wildcard mask is 0.0.1.255. For more information refer to: http://www.cisco.com/c/en/us/support/docs/security/ios-firewall/23602-confaccesslists.html
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