SYN Flood is a DOS attack in which an attacker deliberately violates the three-way handshake and opens a large number of half-open TCP connections. The signature of attack for SYN Flood contains:Select one:a. The source and destination address having the same valueb. A large number of SYN packets appearing on a network without the corresponding reply packetsc. A large number of SYN packets appearing on a network with the corresponding reply packetsd. The source and destination port numbers having the same value
Question
SYN Flood is a DOS attack in which an attacker deliberately violates the three-way handshake and opens a large number of half-open TCP connections. The signature of attack for SYN Flood contains:Select one:a. The source and destination address having the same valueb. A large number of SYN packets appearing on a network without the corresponding reply packetsc. A large number of SYN packets appearing on a network with the corresponding reply packetsd. The source and destination port numbers having the same value
Solution
The correct answer is:
b. A large number of SYN packets appearing on a network without the corresponding reply packets
Explanation:
In a SYN flood attack, the attacker sends a large number of SYN (synchronize) packets to a target system from spoofed IP addresses. These packets are part of the normal three-way handshake process used to establish a connection in a TCP/IP network, which goes SYN > SYN-ACK > ACK.
However, in a SYN flood attack, the attacker never responds to the SYN-ACK (synchronize-acknowledge) packets sent by the target system, leaving a large number of half-open connections. This can consume enough resources to make the system unresponsive to legitimate traffic.
Therefore, a large number of SYN packets without the corresponding reply packets (SYN-ACKs) is a signature of a SYN flood attack.
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