32 Questions
What is the purpose of redundancy in computer systems?
To preserve operations and data in case of failure
How does the Internet achieve reliability in case of failures?
By dynamically routing data via redundant connections
What is the role of firewalls in network security?
To prevent attackers from accessing the internal network
Which term refers to the ability of the Internet to keep working as it grows?
Scalability
What is the main benefit of building redundancy into the physical systems of the Internet?
Increased fault tolerance and scalability
Why do devices on the Internet often fail at unexpected times?
Because failures occur in groups, such as a whole city
What is the main function of a firewall?
To monitor network traffic and block or allow traffic based on security rules
Which type of firewall is also known as a dynamic firewall?
Stateful firewall
What is a weakness of stateless firewalls when it comes to packet filtering?
They can potentially allow spoofing of address information in a packet
What is a strength of stateful firewalls in comparison to stateless firewalls?
They are able to determine the connection state of packets
Which type of firewall works by inspecting individual packets in isolation?
Stateless firewall
What is a common weakness of stateless firewalls in packet filtering?
They can potentially be spoofed by the sender
Which type of firewall is good for stopping SYN attacks?
Stateful firewall
What is a strength of stateless firewalls in comparison to stateful firewalls?
They can give warnings of a possible attack before it happens
What layer do stateful firewalls operate on?
Transport Layer
What type of firewall is able to view more of the network packet to determine whether to allow or block traffic?
Stateful firewall
What is the significance of building redundancy into the physical systems of the Internet?
It increases the Internet's fault tolerance and helps it scale.
How does the Internet achieve reliability in case of failures?
By building many redundant connections into its physical systems.
What is the role of firewalls in network security?
They provide an essential layer of security and prevent attackers from accessing the internal network in malicious ways.
What is the main function of a firewall?
To prevent unauthorized access and ensure security.
What is the significance of fault tolerance in computer systems?
It allows the system to work around problems and continue functioning even if parts fail.
How does redundancy in computer systems contribute to preserving operations and data?
It ensures that data can be preserved even if part of the system fails.
What is the main difference between stateless and stateful firewalls?
Stateless firewalls inspect individual packets in isolation, while stateful firewalls determine the connection state of packets.
What are the weaknesses of stateless (packet filtering) firewalls?
Address information in a packet can potentially be spoofed by the sender, and data within an allowed packet may contain unwanted data that can be used by attackers to exploit known bugs in the system.
What is an advantage of stateless (packet filtering) firewalls?
They are simple and easy to implement, and they can give warnings of a possible attack before it happens (e.g. by detecting port scans).
What layer do stateful firewalls operate on?
Stateful firewalls operate on the Transport layer.
What is the function of an application gateway firewall?
The application level gateway is a proxy for applications, exchanging data between two parties.
What are the weaknesses of stateful (dynamic) firewalls?
They may require substantial modification of the programs that normally provide transport functions.
What is an advantage of stateful (dynamic) firewalls?
Stateful packet inspectors typically have the same features as static packet filters, but they're able to view more of the network packet to determine whether to allow or block traffic.
What are the three types of firewalls mentioned in the text?
The three types of firewalls mentioned are stateless (packet filtering) firewall, stateful (dynamic) firewall, and application gateway firewall.
What are the potential weaknesses of stateless firewalls when it comes to packet filtering?
Address information in a packet can potentially be spoofed by the sender, and data within an allowed packet may contain unwanted data that can be used by attackers to exploit known bugs in the system.
What are the potential strengths of stateful firewalls in comparison to stateless firewalls?
Stateful firewalls are much more flexible than stateless firewalls, as they can determine the connection state of packets and view more of the network packet to determine whether to allow or block traffic.
This quiz covers the concept of redundancy in computer systems and the Internet. It explains the importance of redundancy in preserving data, maintaining availability, and protecting the CIA triad. Additionally, it discusses how the Internet is designed to be reliable through redundant connections.
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