What is a disadvantage of DDNS?

  • DDNS is considered malignant and must be monitored by security software.
  • DDNS is unable to co-exist on a network subdomain that also uses DNS.
  • Using DDNS, a change in an existing IP address mapping can take over 24 hours and could result in a disruption of connectivity.
  • Using free DDNS services, threat actors can quickly and easily generate subdomains and change DNS records.
Explanation & Hint:

A disadvantage of Dynamic DNS (DDNS) is:

Using free DDNS services, threat actors can quickly and easily generate subdomains and change DNS records.

This can be exploited for malicious purposes, such as creating command and control channels for malware or setting up phishing sites. Since the DNS records can be updated dynamically, it becomes difficult for law enforcement and security professionals to track and mitigate the threat. Additionally, because many DDNS services are legitimate and widely used, blocking them outright can have negative impacts on legitimate users.

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