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Computer Network Firewall

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Which of the following parameters can be used by a firewall to decide whether to forward/drop packets?

(a) Sources IP address and destination IP address

(b) TCP/UDP sources and destination port numbers

(c) TCP/SYN and ACK bits

(d) All of these
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(d) All of these

A & B are well known facts.

In TCP ACK bit filtering, only packets with the ACK bit set are allowed into a network, so that the firewall knows that those packets were requested by users within that network. Hence, (d)
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