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05 - Denial of Service

 1. A Denial-of-Service (DoS) attack is an attack meant to shut down a machine or network, making it inaccessible to its intended users.

  FALSE

  TRUE

 2. An attack like this occurs when multiple systems flood the bandwidth of a targeted system, usually one or more _________.

  individuals (humans)

  client machines

  web servers

  website html pages

 3. Panix, the third-oldest ISP in the world, was the target of what is thought to be the first DoS attack. This was in the year 1996.

  FALSE

  TRUE

 4. In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from _________.

  a human and not a computer.

  only two sources, each in the same location.

  many different sources.

  a single source.

 5. The above scenario effectively makes it impossible to stop the attack simply by ______________________.

  asking for permission.

  blocking a single source.

  visiting people's homes.

  blocking the ISPs packet switching network.

 6. Criminal perpetrators of DoS attacks often target sites or services hosted on high-profile web servers such as banks or credit card payment gateways.

  FALSE

  TRUE

 7. Revenge, blackmail and activism is never likely to be the reason behind any of these attacks.

  FALSE

  TRUE

 8. A _________________ attack typically involves more than around 3?5 nodes on different networks; fewer nodes may qualify as a DoS attack but is not a DDoS attack.

  distributed denial of service

  disintegrated systems

  disinfected serial

  denegrated service

 9. The simplest DoS attack relies primarily on ________, flooding the target with an overwhelming flux of packets, depleting the target's system resources.

  sql injections

   brute force

  vulnerabilities in government security

  careful physical intervention on the client side

 10. A SYN flood occurs when a host sends a flood of__________________ often with a forged sender address.

  TCP/IP procotols

  physical letters in the post

  MAC addresses

   TCP/SYN packets,