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What countermeasure should Stephen implement to secure the organization's IoT network?

  1. Disable UPnP port on routers

  2. Keep the default passwords

  3. Ignore security guidelines

  4. Enable remote access without restrictions

The correct answer is: Disable UPnP port on routers

Disabling UPnP (Universal Plug and Play) port on routers is a highly effective countermeasure for securing an organization's IoT network. UPnP can automatically discover devices and services on a network, which simplifies connectivity but also poses security risks. Attackers can exploit UPnP vulnerabilities to gain unauthorized access to devices or sensitive information. By disabling UPnP, Stephen would significantly reduce the risk of such vulnerabilities being exploited. This action helps to control which devices can connect to the network, thus enhancing overall security. It is essential to keep the network as restricted as possible, especially in environments where IoT devices, which may have varying levels of built-in security, are present. The other options present poor security practices. Keeping default passwords leaves devices vulnerable to easy access by malicious actors, ignoring security guidelines removes critical protection protocols, and enabling remote access without restrictions vastly increases the attack surface, making systems much more susceptible to breaches.