A VPN can help defend against DoS attacks by masking the IP address of a user or device and encrypting their traffic, making it more difficult for attackers to identify and target them. However, while a VPN can help protect against some forms of DoS attacks, it is important to understand that a VPN alone cannot provide complete protection. To properly defend against DoS attacks, organizations should employ dedicated security solutions and best practices for network security and educate staff members on cyber security basics.