Podcast
Questions and Answers
What is a common vulnerability of wireless networks in terms of security?
What is a common vulnerability of wireless networks in terms of security?
What is the primary function of a packet filter firewall?
What is the primary function of a packet filter firewall?
What are the two possible default policies for packet filter firewalls?
What are the two possible default policies for packet filter firewalls?
What is the primary goal of a firewall?
What is the primary goal of a firewall?
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What type of firewall is considered the simplest and fastest?
What type of firewall is considered the simplest and fastest?
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What type of firewall examines each IP packet in isolation, without context?
What type of firewall examines each IP packet in isolation, without context?
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What is the recommended default policy for a packet filter firewall?
What is the recommended default policy for a packet filter firewall?
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What is the role of a packet filter firewall in the network?
What is the role of a packet filter firewall in the network?
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Where is a packet filter firewall typically placed in the network?
Where is a packet filter firewall typically placed in the network?
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What is the purpose of a packet filter firewall in Figure 22.1?
What is the purpose of a packet filter firewall in Figure 22.1?
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Study Notes
Firewalls
- A single-homed bastion host can be compromised if the packet-filtering router is compromised, allowing external bogus traffic to reach internal servers.
- A screened host firewall with a single-homed bastion host configuration provides greater security, implementing both packet-level and application-level filtering.
Dual-Homed Bastion Host
- A dual-homed bastion host physically separates external and internal networks, requiring two systems to be compromised for a breach.
- This configuration provides dual layers of security and allows for direct Internet access to specific internal servers if desired.
Demilitarized Zone (DMZ) Networks
- An internal firewall adds more stringent filtering capability to protect enterprise servers and workstations from external attacks.
- The internal firewall provides two-way protection: protecting the internal network from DMZ system attacks and protecting DMZ systems from internal network attacks.
- Multiple internal firewalls can be used to protect portions of the internal network from each other.
Distributed Firewalls
- A distributed firewall configuration involves stand-alone firewall devices and host-based firewalls working together under central administrative control.
- This configuration allows for protection against internal attacks and tailored protection for specific machines and applications.
Types of Firewalls
- There are four common types of firewalls: packet filters, stateful packet filters, application-level gateways, and circuit-level gateways.
Packet Filters
- Packet filters are the simplest and fastest firewall component, examining each IP packet and permitting or denying access according to rules.
- They restrict access to services (ports) and can have default policies, either prohibiting access by default or permitting access by default.
- Packet filters can be placed in a border router between the external Internet and internal private network, utilizing information from transport, network, and data link layers to make decisions on allowable traffic flows.
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Description
Learn about the configuration of a single-homed bastion host firewall and the potential security risks. This quiz covers the limitations of packet-filtering routers and the importance of proper firewall setup.
