Users are unable to connect to the web server at IP 192.168.0.20. Which of the following can be inferred of a
firewall that is configured ONLY with the following ACL?
PERMIT TCP ANY HOST 192.168.0.10 EQ 80
PERMIT TCP ANY HOST 192.168.0.10 EQ 443
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A.
It implements stateful packet filtering.
B.
It implements bottom-up processing.
C.
It failed closed.
D.
It implements an implicit deny.
Explanation:
Implicit deny is the default security stance that says if you aren’t specifically granted access or privileges for a
resource, you’re denied access by default. Implicit deny is the default response when an explicit allow or deny
isn’t present.