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Which of the following protocols and services if left unchecked can be exploited for use in an amplification DDOS attack? (Select 3 correct answers)
RTP
DNS
ICMP
NTP
FTP
Telnet
ICMP Amplification is typically performed in a Smurf Attack, in which a victim's IP address is spoofed and the packet is sent to the broadcast address on the network, this causes all the responding machines to send a large amount of traffic towards the victim. DNS Amplification is performed when an attacker spoofs a victim's IP address on a DNS query, typically requesting a large amount of zone information to increase the amount of amplification caused by the returning responses from the DNS servers. NTP amplification is performed by issuing the 'monlist' command to elicit a response from the server.
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