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Questions and Answers
What is one of the most common and simplest attacks on a system?
What is one of the most common and simplest attacks on a system?
Which of the following is not a valid way to define a computer's workload?
Which of the following is not a valid way to define a computer's workload?
What do you call a DoS launched from several machines simultaneously?
What do you call a DoS launched from several machines simultaneously?
Leaving a connection half open is referred to as what?
Leaving a connection half open is referred to as what?
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What is the basic mechanism behind a DoS attack?
What is the basic mechanism behind a DoS attack?
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What is the most significant weakness in a DoS attack from the attacker's viewpoint?
What is the most significant weakness in a DoS attack from the attacker's viewpoint?
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What is the most common class of DoS attacks?
What is the most common class of DoS attacks?
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What are three methods for protecting against SYN flood attacks?
What are three methods for protecting against SYN flood attacks?
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Which attack mentioned in this chapter causes a network to perform a DoS on one of its own servers?
Which attack mentioned in this chapter causes a network to perform a DoS on one of its own servers?
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A defense that depends on a hash encryption being sent back to the requesting client is called what?
A defense that depends on a hash encryption being sent back to the requesting client is called what?
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What type of defense depends on sending the client an incorrect SYNACK?
What type of defense depends on sending the client an incorrect SYNACK?
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What type of defense depends on changing the server so that unfinished handshaking times out sooner?
What type of defense depends on changing the server so that unfinished handshaking times out sooner?
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What type of attack is dependent on sending packets too large for the server to handle?
What type of attack is dependent on sending packets too large for the server to handle?
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What type of attack uses Internet routers to perform a DoS on the target?
What type of attack uses Internet routers to perform a DoS on the target?
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Which of the following is an example of a DDoS attack?
Which of the following is an example of a DDoS attack?
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How can securing internal routers help protect against DoS attacks?
How can securing internal routers help protect against DoS attacks?
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What can you do to your internal network routers to help defend against DoS attacks?
What can you do to your internal network routers to help defend against DoS attacks?
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Which of the following was rated by many experts to be the fastest growing virus on the Internet?
Which of the following was rated by many experts to be the fastest growing virus on the Internet?
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What can you do with your firewall to defend against DoS attacks?
What can you do with your firewall to defend against DoS attacks?
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Why will protecting against Trojan horse attacks reduce DoS attacks?
Why will protecting against Trojan horse attacks reduce DoS attacks?
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Study Notes
Denial of Service (DoS) Attacks
- Denial of Service (DoS) attacks are one of the most prevalent and straightforward methods to disrupt a system.
- DoS attacks exploit the fact that computers can only manage a finite load, making them vulnerable to overwhelming traffic.
- A DoS attack launched from multiple machines is termed a Distributed Denial of Service (DDoS) attack.
- Leaving a connection half open is categorized as a SYN flood attack.
Definitions and Characteristics
- Basic mechanism behind a DoS attack hinges on the finite capacity of computers to handle requests.
- A significant challenge for attackers is that DoS attacks must be sustained for effectiveness.
- The most common class of DoS attacks is DDoS attacks, which utilize multiple source points.
Protection and Defense Mechanisms
- Effective defenses against SYN flood attacks include SYN cookies, RST cookies, and stack tweaking.
- The use of SYN cookies enables secure SYN-ACK communications to mitigate potential attacks.
- RST cookies rely on sending incorrect SYN-ACK responses to thwart connection attempts.
- Stack tweaking involves adjusting server settings to timeout unfinished handshakes more rapidly.
Types of Attacks
- Ping of death attacks rely on sending oversized packets that the target server cannot manage.
- Smurf attacks exploit Internet routers to launch DoS attacks on a target by amplifying the traffic.
Notable Threats
- MyDoom virus is categorized as one of the fastest-growing viruses linked to DDoS attacks.
- Professionals rate the Smurf virus highly due to its impact and spread on the Internet.
Network Security Measures
- Securing internal routers can help limit the propagation of DoS attacks across network segments.
- Disallowing incoming traffic from untrusted sources can fortify internal networks against external threats.
- Firewalls can be configured to block incoming ICMP packets, providing a defensive layer against potential DoS attacks.
Relationship Between Trojan Horses and DoS Attacks
- Protecting against Trojan horse attacks is crucial as they are often used to facilitate DoS attacks by commandeering unsuspecting machines to execute them.
Studying That Suits You
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Description
Test your knowledge with these flashcards from CSCE 201 Chapter 4. This quiz covers key concepts related to system attacks and computer workloads. Perfect for students preparing for examinations or wanting to reinforce their understanding of the material.
