单选题What is the purpose of an explicit "deny any" statement at the end of an ACL？（）Anone，since it is implicitBto enable Cisco IOS IPS to work properly；however，it is the deny all traffic entry that is actually requiredCto enable Cisco IOS Firewall to work properly；however，it is the deny all traffic entry that is actually requiredDto allow the log option to be used to log any matchesEto prevent sync flood attacksFto prevent half-opened TCP connections
单选题
What is the purpose of an explicit "deny any" statement at the end of an ACL？（）
A
none，since it is implicit
B
to enable Cisco IOS IPS to work properly；however，it is the deny all traffic entry that is actually required
C
to enable Cisco IOS Firewall to work properly；however，it is the deny all traffic entry that is actually required
D
to allow the log option to be used to log any matches
E
to prevent sync flood attacks
F
to prevent half-opened TCP connections
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