The network administrator A wants to use ACL to match only the four routing entries 1, 3.5, and 7 in the figure. How many ACL rules does the network administrator A need to configure at least?
To match only the four routing entries 1, 3, 5, and 7, network administrator A needs to configure at least 4 ACL rules.
Since the routing entries are not contiguous, a single ACL rule cannot match all four entries. Each entry needs to be matched separately.
Here's an example of how the ACL rules could be configured:
Rule 1: permit 10.0.1.0/24
Rule 2: permit 10.0.3.0/24
Rule 3: permit 10.0.5.0/24
Rule 4: permit 10.0.7.0/24
Therefore, the correct answer is:
C. 4
It is possible, but you can also achieve the same result with only one rule. If you configure "rule 1 permit source 10.0.1.0 0.0.254.0", all bits on 3rd octet can vary except the last one - therefore, allowing only odd numbers
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