Layer-4 firewall - Definition,Properties,Features - Networking

Q.  Which one of the following statement is true for a layer-4 firewall which is a device that can look at all protocol headers up to the transport layer? (Networking)
- Published on 25 Jun 15

a. It cannot block TCP traffic from a specific user on a multiple-user system during 9.00pm and 5.00pm
b. It cannot stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address.
c. It cannot block entire HTTP traffic during 9.00 pm and 5.00pm
d. It cannot block all ICMP traffic.

ANSWER: It cannot block entire HTTP traffic during 9.00 pm and 5.00pm
 
The layer 4 firewall is a device that can look at all the protocol headers upto the transport layer and not the headers above that layer.

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