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Which type of data does a packet-filtering firewall inspect when it decides whether to forward or drop a packet?1 pointSource and destination IP addresses.TCP/UDP source and destination port numbers.ICMP message type.TCP SYN and ACK bits.All of the above.

Question

Which type of data does a packet-filtering firewall inspect when it decides whether to forward or drop a packet?1 pointSource and destination IP addresses.TCP/UDP source and destination port numbers.ICMP message type.TCP SYN and ACK bits.All of the above.

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Solution

A packet-filtering firewall inspects all of the above types of data when deciding whether to forward or drop a packet. This includes:

  1. Source and destination IP addresses: The firewall checks the IP addresses the packet is coming from and going to. If the addresses are deemed safe, the packet is forwarded. If not, it's dropped.

  2. TCP/UDP source and destination port numbers: The firewall also checks the port numbers. Certain port numbers are associated with certain types of traffic and can be blocked or allowed based on that.

  3. ICMP message type: ICMP messages are used to send error messages or operational information indicating, for example, that a requested service is not available or that a host or router could not be reached. The firewall can inspect these message types as part of its decision-making process.

  4. TCP SYN and ACK bits: These are flags in the TCP header of a packet that indicate the state of the connection. The SYN flag synchronizes sequence numbers to initiate a TCP connection, while the ACK flag acknowledges the receipt of a previous packet or packets. The firewall can inspect these bits to monitor the state of the TCP connection and make decisions based on that.

So, the answer is "All of the above."

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