A layer-4 firewall ( a device that can look at all protocol headers up to the transport layer) CANNOT

Question

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block all ICMP traffic

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block HTTP traffic during 9:00PM and 5:00AM

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block TCP traffic from a specific user on a specific IP address on multi-user system during 9:00PM and 5:00AM

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stop incoming traffic from a specific IP address but allow outgoing traffic to same IP

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

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