Firewall: A firewall is security software which imposes a set of protocols to prevent specific types of data from moving among trusted and untrusted level of networks. An example of trusted network is “Organization’s Internet”. Similarly for untrusted network is “Internet”.

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Keep in mind that packet reordering and reassembly occurs throughout the TCP/IP protocol suite's functioning throughout the transport phase.A firewall can function at a lower abstraction level, such as the Internet or data layer, if necessary.A stateful inspection firewall that uses stateful inspection will lose any information about a traffic stream that is out of order or has been destroyed.

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Chapter 6, Problem 2E

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Firewall:

A firewall is security software which imposes a set of protocols to prevent specific types of data from moving among trusted and untrusted level of networks.

An example of trusted network is “Organization’s Internet”. Similarly for untrusted network is “Internet”.

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Keep in mind that packet reordering and reassembly occurs throughout the TCP/IP protocol suite's functioning throughout the transport phase.A firewall can function at a lower abstraction level, such as the Internet or data layer, if necessary.A stateful inspection firewall that uses stateful inspection will lose any information about a traffic stream that is out of order or has been destroyed.

Keep in mind that the TCP/IP protocol suite's reassembly and reordering of packets happens during the transport phase. Some firewalls are designed to function just at the Internet or data layer level of abstraction. Without the proper sequence or the absence of a deleted packet, a stateful inspection firewall cannot make any inferences about the traffic being inspected.

Keep in mind that the TCP/IP protocol suite's transport phase involves reordering and reassembly of packets. A firewall may function at the Internet or data layer level of abstraction. If a traffic stream is corrupted or removed, a stateful inspection firewall will be unable to learn anything about it.