單項選擇題Which of these is mandatory when configuring Cisco IOS Firewall？ （）

A.Cisco IOS IPS enabled on the untrusted interface
B.NBAR enabled to perform protocol discovery and deep packet inspection
C.a route map to define the trusted outgoing traffic
D.a route map to define the application inspection rules
E.an inbound extended ACL applied to the untrusted interface


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2.單項選擇題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