Packet-Filtering Gateways vs Stateful Inspection Firewall
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Questions and Answers

What is a key difference between packet-filtering gateways and stateful inspection firewalls?

  • Packet-filtering gateways analyze each packet's IP addresses and ports.
  • Stateful inspection firewalls look at combinations of addresses and ports/protocols.
  • Stateful inspection firewalls control access based on packet address and transport protocol type. (correct)
  • Packet-filtering gateways maintain state information from one packet to the next.
  • In the context of the text, what is the primary function of a packet-filtering gateway?

  • Filtering traffic based on source IP rather than port. (correct)
  • Maintaining state information from one packet to the next.
  • Simulating application behavior at OSI layer 7.
  • Counting the number of systems coming from external IPs.
  • What characteristic distinguishes application proxies from packet-filtering gateways and stateful inspection firewalls?

  • Application proxies simulate application behavior at OSI layer 7. (correct)
  • They maintain state information across packets.
  • Application proxies analyze IP addresses and ports of each packet.
  • They control access based on specific transport protocol types.
  • Based on the text, what is a limitation mentioned regarding defining rules requiring state/context?

    <p>Attackers can easily avoid these rules.</p> Signup and view all the answers

    What does a stateful inspection firewall do that packet-filtering gateways do not?

    <p>Maintain state information from one packet to the next.</p> Signup and view all the answers

    Which type of gateway is most likely to filter out Telnet traffic but allow HTTP traffic in the context provided?

    <p>Packet-Filtering Gateway</p> Signup and view all the answers

    What is one of the purposes of application proxies mentioned in the text?

    <p>Filtering potentially dangerous application-layer requests</p> Signup and view all the answers

    At which OSI layer does a circuit-level gateway operate?

    <p>Layer 5 - Session layer</p> Signup and view all the answers

    What is a common use of a circuit-level gateway mentioned in the text?

    <p>Implementing a VPN</p> Signup and view all the answers

    How does a personal firewall differ from other firewalls according to the text?

    <p>It can restrict which applications are allowed to use the network</p> Signup and view all the answers

    How does a guard firewall function according to the text?

    <p>It receives protocol data units, interprets them, and may emit modified units</p> Signup and view all the answers

    Which type of firewall determines what services to perform on the user's behalf according to the text?

    <p>Guard firewall</p> Signup and view all the answers

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