Question

Which type of data does a packet-filtering firewall inspect when it decides whether to forward or drop a packet? a.source and destination ip address b.tcp/udp source and destination port numbers c.icmp message type d.TCP SYN and ACK bits e.all of the above

Answer 1

Answer:

The packets filtering firewall shows how filtration is executed on the firewall. The packet filtering firewall checks access control lists (ACLs) to separate packets depending upon the upper-layer protocol ID, source and destination port numbers, source and destination IP addresses, and packet transmission route.Packet filters work by inspecting the source and destination IP and port addresses contained in each Transmission Control Protocol/Internet Protocol (TCP/IP) packet. TCP/IP ports are numbers that are assigned to specific services that help to identify for which service each packet is intended.

Answer 2

The correct answer to this question is option e. All of the above.

Explanation:

• Being the most elementary type of firewall architecture, packet-filtering firewalls chiefly create a barrier at a switch or traffic router.  

• The firewall performs a simple check of the data packets coming through the router without opening up the packet to examine its contents.

• The packet-filtering firewall inspects not only the source and destination addresses and port numbers, but for a TCP connection, it also examines the code bits and other surface-level information.