A program sends a flood of UDP packets from a spoofed host to a server on the subnet sweeping through all the known UDP ports looking for closed ports. This will cause the server to reply with an ICMP port unreachable message. Which attack is this?

Last Updated: Dec 21, 2022
IT Exam Items Repository › Category: CCNA 3 v7 › A program sends a flood of UDP packets from a spoofed host to a server on the subnet sweeping through all the known UDP ports looking for closed ports. This will cause the server to reply with an ICMP port unreachable message. Which attack is this?

A program sends a flood of UDP packets from a spoofed host to a server on the subnet sweeping through all the known UDP ports looking for closed ports. This will cause the server to reply with an ICMP port unreachable message. Which attack is this?

  • TCP reset attack
  • UDP flood attack
  • TCP SYN Flood attack
  • DoS attack
  • TCP session hijacking

Explanation: A UDP flood attack sends a flood of UDP packets to the target’s closed ports causing the target to reply with ICMP port unreachable messages. Because there are many closed ports on the server, this creates a lot of traffic on the segment, which uses up most of the bandwidth. The result is very similar to a DoS attack.

Related exam: 3.7.6 Check Your Understanding - TCP and UDP Vulnerabilities
Related exam: 16.3.6 Check Your Understanding - TCP and UDP Vulnerabilities

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