Q. 2 A layer-4 firewall (a device that can look at all protocol headers up to the transport
layer) CANNOT
(A) block entire HTTP traffic during 9:00 PM and 5:00 AM
(B) block all ICMP traffic
(C) stop incoming traffic from a specific IP address but allow outgoing traffic to
the same IP address
(D) block TCP traffic from a specific user on a multi-user system during 9:00
PM and 5:00 AM
Answer: (A)
Explanation:
