Which statement is true regarding the stateful inspection firewall?

Which statement is true regarding the stateful inspection firewall?

• A. The stateful inspection firewall needs to match the rules for each incoming packet
• B. UDP packets cannot be matched with the status table
• C. Packets of the same connection are correlated during checks
• D. The stateful inspection firewall only needs to match the first data packet against a rule

Answer: (D)

The stateful inspection firewall maintains a state table that keeps track of the state of active connections. When a packet arrives, the firewall examines the state table to determine if the packet is part of an existing connection. This process allows the firewall to efficiently manage and filter traffic. The correct statement highlights that the stateful inspection firewall primarily needs to match the first data packet of a connection against its established rules. Upon successful verification, the connection is added to the state table, and subsequent packets belonging to this connection can then be allowed or denied based on their state without needing to re-evaluate them against the rules. This makes the process more efficient as recurring checks against the rules for every single packet are not necessary after the initial packet is inspected. The other statements do not accurately reflect how stateful firewalls operate. For example, matching rules for every incoming packet is inefficient and not how stateful firewalls are designed to function. UDP packets, while they are connectionless and do not maintain state in the same way TCP does, can still have their monitoring tied to stateful inspections albeit in a limited manner. As for matching only the first packet, this is partially true, but the firewall typically evaluates the first packet before making a decision on whether to allow or

The stateful inspection firewall maintains a state table that keeps track of the state of active connections. When a packet arrives, the firewall examines the state table to determine if the packet is part of an existing connection. This process allows the firewall to efficiently manage and filter traffic.

The correct statement highlights that the stateful inspection firewall primarily needs to match the first data packet of a connection against its established rules. Upon successful verification, the connection is added to the state table, and subsequent packets belonging to this connection can then be allowed or denied based on their state without needing to re-evaluate them against the rules. This makes the process more efficient as recurring checks against the rules for every single packet are not necessary after the initial packet is inspected.

The other statements do not accurately reflect how stateful firewalls operate. For example, matching rules for every incoming packet is inefficient and not how stateful firewalls are designed to function. UDP packets, while they are connectionless and do not maintain state in the same way TCP does, can still have their monitoring tied to stateful inspections albeit in a limited manner. As for matching only the first packet, this is partially true, but the firewall typically evaluates the first packet before making a decision on whether to allow or