Final answer:
To increase security on a corporate network switch, you should restrict access management and update the switch's firmware, using strong encryption protocols like SSH and ensuring all applied changes are logged for auditing.
Step-by-step explanation:
As the IT security administrator for a small corporate network, your task is to enhance the security of the switch located in the Networking Closet. To accomplish this, you should start by restricting access management to the switch. This involves setting up Access Control Lists (ACLs), implementing port security features that limit the number of valid MAC addresses per port, and enabling management protocols like SSH for secure access while disabling protocols such as Telnet which are not secure. Furthermore, it is essential to update the switch's firmware to the latest version, which ensures that any known vulnerabilities are patched and the switch is equipped with the latest security features. Remember to perform this update during a maintenance window, as the process may cause network interruption.
For access management, consider implementing strong password policies and change management protocols to prevent unauthorised access. Use two-factor authentication if possible. For firmware updates, always verify the source of the firmware and ensure that you have a backup of the current configuration before proceeding. Document the changes made and log any access to the switch for auditing purposes.