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## Passwords and Security

Passwords and security are of utmost importance for the security of your router. This chapter provides the information you need to configure your E-series router to be secure for all levels of users.

This chapter contains the following sections:

- Overview
- Platform Considerations
- Setting Basic Password Parameters
- Setting and Erasing Passwords
- Vty Line Authentication and Authorization
- Virtual Terminal Access Lists
- Secure System Administration with SSH
- Restricting User Access
- Denial of Service (DoS) Protection

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