How To Secure Cisco Catalyst Switches?
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1. Change Default Passwords: Begin by ensuring that all services and protocols are configured with passwords different from their factory defaults.
2. Restrict Access: Prohibit access to the switch from outside sources, such as an individual’s workstation or laptop.
3. Separate Networks: Use VLANs (Virtual LANs) to keep traffic of various types separate.
4. Enable Port Security: Allow only authorized MAC addresses to gain access to the switch ports.
5. Use Strong Encryption: Configure strong encryption on all access and control links, including remote access links.
6. Monitor Activity: Monitor switch activity for suspicious traffic and activities.
7. Upgrade Firmware: Regularly update the firmware of your switches to ensure that you have the latest security features.
8. Audit and Test Security Policies: Regularly review security policies and configurations and test them to ensure that they are secure.
9. Implement Access Control Lists: Utilize access control lists to limit the communication between network segments and to prevent unauthorized access.
10. Disable Unnecessary Services: Disable any unnecessary services on the switch, such as Telnet, SNMP, and HTTP.