Cybercrimes: Denial of Service Attacks 6
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Questions and Answers

What is the primary aim of a Denial-of-Service attack?

  • To prevent legitimate users from accessing a system resource (correct)
  • To allow unauthorized access to a system resource
  • To permanently damage a computer system
  • To enhance the performance of a networked system
  • Which type of DoS attack primarily consumes available network bandwidth?

  • Application layer attacks
  • Volume-based attacks (correct)
  • Resource starvation attacks
  • Protocol attacks
  • What characterizes Protocol attacks in the context of DoS attacks?

  • They exploit vulnerabilities in specific protocols. (correct)
  • They overload network bandwidth.
  • They involve sending random data to web servers.
  • They are always unintentional.
  • What is an example of an unintentional DoS attack?

    <p>A sudden spike in traffic to a popular website</p> Signup and view all the answers

    Which of the following is a common type of application layer attack?

    <p>Crashing a web server due to unexpected data</p> Signup and view all the answers

    What is the primary goal of a UDP flood attack?

    <p>To overload the targeted server's ability to process requests</p> Signup and view all the answers

    Which attack involves sending oversized ICMP ECHO request packets?

    <p>Ping of Death Attack</p> Signup and view all the answers

    How does a Teardrop Attack function?

    <p>By sending fragmented packets of differing sizes to prevent reassembly</p> Signup and view all the answers

    What is a characteristic of an ICMP flood attack?

    <p>It consists of sending frequent ICMP echo requests to consume bandwidth</p> Signup and view all the answers

    In what scenario is a Smurf Attack most effective?

    <p>When a large number of ICMP packets are sent to a broadcast address</p> Signup and view all the answers

    Which DyOS attack can result in permanent damage to a service?

    <p>Permanent Denial-of-Service Attacks</p> Signup and view all the answers

    What is the result of a successful SYN attack?

    <p>The server's ability to process genuine TCP connections diminishes</p> Signup and view all the answers

    What type of attack exploits the differences in packet sizes during transmission?

    <p>Teardrop Attack</p> Signup and view all the answers

    What is the purpose of a TCP SYN flood attack?

    <p>To exploit the TCP three-way handshake and exhaust server resources.</p> Signup and view all the answers

    Which of the following describes a Smurf flood attack?

    <p>ICMP requests are sent to the broadcast address to overwhelm the victim's bandwidth.</p> Signup and view all the answers

    What mechanism is exploited in a Land attack?

    <p>A fake TCP SYN packet with matching source and destination IPs.</p> Signup and view all the answers

    What distinguishes a Permanent DoS (PDoS) attack from other DoS attacks?

    <p>It permanently damages hardware or software, requiring replacement.</p> Signup and view all the answers

    During a TCP SYN flood attack, what happens when the last message of the handshake is not received?

    <p>The server allocates memory for a pending connection and waits.</p> Signup and view all the answers

    In the context of DoS attacks, what is the role of a broadcast IP address during a Smurf attack?

    <p>It serves as a destination for ICMP requests sent by the attacker.</p> Signup and view all the answers

    Which of the following is a characteristic of a TCP SYN flood attack?

    <p>It exploits the TCP 3-way handshake by sending incomplete connection requests.</p> Signup and view all the answers

    Study Notes

    Cybercrimes and Threats: Denial of Service Attacks (DoS)

    • DoS attacks are malicious attempts to make a networked system unable to operate, but not permanently damage it.
    • A DoS attack aims to prevent authorized users from accessing a system resource.
    • The attacker floods the target computer with data packets to overload its resources.
    • DoS attacks are currently the most expensive computer crime for organizations.

    Classification of DoS Attacks

    • Volume-based attacks (bandwidth attacks): These attacks consume all available network bandwidth. An attacker sends excessive traffic to a target, overloading its resources. Examples include UDP floods, ICMP floods, and spoofed packet floods.

    • Application layer attacks or programming flaws: These attacks exploit vulnerabilities in applications or operating systems. They typically involve sending unexpected data to vulnerable components, aiming to crash the web server.

    • Protocol attacks or resource starvation: These attacks consume system resources like CPU, memory, and storage space. Often they exploit specific features or implementation bugs in network protocols. Examples include TCP SYN floods, fragmented packet attacks, Ping of Death, and Smurf attacks.

    Types or Levels of DoS Attacks

    • ICMP Flood (ping flood): A common DoS attack where an attacker sends many echo requests (pings) to overload a victim's resources.
    • SYN Flood: Exploits the TCP three-way handshake. Attackers send SYN requests but never complete the connection, tying up server resources.
    • UDP Flood: A large volume of UDP packets are sent to the victim, overwhelming its processing capacity.
    • Smurf Attack: An attacker exploits broadcast addresses to send ICMP echo requests to a victim, amplifying the attack's impact.
    • Ping of Death: A packet with an oversized size is sent, overloading the target system, potentially resulting in a crash.
    • Teardrop Attack: Sending fragmented packets with incorrect header information to overwhelm the target system.
    • Land Attack: Sending a TCP packet with the same source and destination IP and port causing a loopback on the target system.
    • Nuke Attack: Repeatedly sending fragmented or invalid packets causing slowdowns in the target.
    • Permanent DoS (PDoS): A type of DoS attack that damages a system so badly that hardware replacement is necessary.

    Distributed Denial-of-Service (DDoS) Attacks

    • DDoS attacks use multiple computers coordinated to overwhelm a target with traffic.
    • Attackers gain unauthorized access to many computers on the Internet to send a flood of data packets to the target computer.
    • This amplifies the attack's impact, making it much harder to defend against than a typical DoS attack.

    Differences Between DoS and DDoS Attacks

    • DoS attacks use a single computer to flood a server. DDoS attacks use multiple machines from across the Internet.
    • A DDoS attack usually involves a larger scale of resources and a greater amount of traffic compared to a DoS attack.
    • A distributed denial-of-service attack is more complicated and difficult to prevent than a denial-of-service attack.

    How to Protect from DoS and DDoS Attacks

    • More Bandwidth: Increase bandwidth capacity to handle spikes.
    • Infrastructure Redundancy: Employ multiple data centers or servers to distribute traffic.
    • Anti-DDoS Hardware/Software: Use specialized firewalls to block or filter malicious traffic specifically designed for DDoS attacks.
    • Network Security: Maintain strong security protocols to prevent unauthorized access such as strong passwords, regular changes and anti-phishing.
    • Monitor System Performance: Identify warning signs such as slowdowns early to respond proactively.
    • Maintain Spare Parts: Have spare computer systems in case one fails during an attack.

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    Related Documents

    Cybercrime and Threats_06 PDF

    Description

    Explore the world of Denial of Service (DoS) attacks, focusing on their types and impacts on networked systems. Learn how attackers exploit resources and the cost implications for organizations. This quiz will test your knowledge on the classification of DoS attacks and their procedures.

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