Principles of Information Security (MindTap Course List)
6th Edition
ISBN: 9781337102063
Author: Michael E. Whitman, Herbert J. Mattord
Publisher: Cengage Learning
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Question
Chapter 6, Problem 2E
Program Plan Intro
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.
Chapter 6 Solutions
Principles of Information Security (MindTap Course List)
Ch. 6 - Prob. 1RQCh. 6 - Prob. 2RQCh. 6 - Prob. 3RQCh. 6 - Prob. 4RQCh. 6 - Prob. 5RQCh. 6 - Prob. 6RQCh. 6 - Prob. 7RQCh. 6 - Prob. 8RQCh. 6 - Prob. 9RQCh. 6 - Prob. 10RQ
Ch. 6 - Prob. 11RQCh. 6 - Prob. 12RQCh. 6 - Prob. 13RQCh. 6 - Prob. 14RQCh. 6 - Prob. 15RQCh. 6 - Prob. 16RQCh. 6 - Prob. 17RQCh. 6 - Prob. 18RQCh. 6 - Prob. 19RQCh. 6 - Prob. 20RQCh. 6 - Prob. 1ECh. 6 - Prob. 2ECh. 6 - Prob. 3ECh. 6 - Prob. 4ECh. 6 - Prob. 5ECh. 6 - Prob. 1CEDQCh. 6 - Prob. 2CEDQCh. 6 - Suppose that Ms. Hamir stacked the deck with her...
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- Keep in mind that the TCP/IP protocol suite's transport phase involves reordering and reassembly of packets. Some firewalls are designed to function just at the Internet or data layer level of abstraction. An out-of-order or deleted traffic stream renders a stateful inspection firewall useless.arrow_forwardDo not forget that the TCP/IP protocol suite's transport stage is where reassembly and reordering of packets occurs. If necessary, 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 not be able to learn anything about it.arrow_forwardExplain succinctly what the following rule will achieve and why it is required when applied to traffic entering a firewall from the Internet. If the status flags tcp syn and tcp fin are both 1, then the proper answer is DENY.arrow_forward
- 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 analyze it.arrow_forwardRemember that packet reordering and reassembly occur throughout the TCP/IP protocol suite's transit phase. A firewall may function at an abstraction level lower than the Internet or data layer. A stateful inspection firewall will be unable to determine anything about an out-of-order or erased traffic stream.arrow_forwardWhat are the key responsibilities of a network firewall in the context of the OSI model? In which layer(s) does it operate?arrow_forward
- It is important to keep in mind that the TCP/IP protocol suite's transport phase is where packet reassembly and reordering occurs. A firewall may function at the Internet or data layer level of abstraction. If a traffic stream is missing or out of order, a stateful inspection firewall will be unable to learn anything about it.arrow_forwardNote that the TCP/IP protocol suite's transport stage is where reassembly and reordering of packets occurs. 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.arrow_forwardYou are given the following “informal firewall policy” details to be implemented usinga firewall like that in the following figure: 1. E-mail may be sent using SMTP in both directions through the firewall, but it must be relayed via the DMZ mail gateway that provides header sanitization and content filtering. External e-mail must be destined for the DMZ mail server.2. Users inside may retrieve their e-mail from the DMZ mail gateway, using either POP3 or POP3S, and authenticate themselves.3. Users outside may retrieve their e-mail from the DMZ mail gateway, but only if they use the secure POP3 protocol and authenticate themselves.4. Web requests (both insecure and secure) are allowed from any internal user out through the firewall but must be relayed via the DMZ Web proxy, which provides content filtering (noting this is not possible for secure requests), and users must authenticate with the proxy for logging.5. Web requests (both insecure and secure) are allowed from anywhere on the…arrow_forward
- What is the most important function of a firewall?I'm currently developing a packet-filtering software. In what location can I get a detailed description of the rules I must follow?arrow_forwardWhat is the most important function of a firewall?I am currently developing a packet-filtering software. How can I get a copy of the rules I must follow?arrow_forwardRemember that the reordering and reassembly of packets happens in the transport stage of the TCP/IP protocol suite. Firewalls are often employed on lower layers, such as the Internet or the data layer. Whether a firewall relies on stateful inspection, how does it know if a connection has been severed or lost?arrow_forward
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