tailieunhanh - CNNA3-Chapter 2: Part II

Password RecovePassword Recovery: To recover a switch password: Power up the switch with the Mode button pressed. Initialize flash. Load helper files Rename the current configuration file. Reboot the system. Reinstate the name of the configuration file and copy it into RAM. Change the password. Copy to start up configuration Reload the switch. | Chapter 2 Switch Concepts and Configuration Part II Switch Concepts and Configuration Configuring Switch Security Passwords Encryption Console Telnet / SSH Password Recovery MAC Address Flooding Spoofing Attacks CDP Attacks Telnet Attacks Security Tools Port Security Securing Console Access: Configuring Password Options Securing Virtual Terminal Access: There are 16 available default Telnet sessions as opposed to the 5 sessions set up for a router. Configuring Password Options Securing Privileged EXEC Access: Always use enable secret for password encryption. Configuring Password Options Encrypting Switch Passwords: You can encrypt all passwords assigned to a switch using the service password-encryption command. Configuring Password Options Password Recovery: To recover a switch password: Power up the switch with the Mode button pressed. Initialize flash. Load helper files Rename the current configuration file. Reboot the system. Reinstate the name of the configuration file and copy | Chapter 2 Switch Concepts and Configuration Part II Switch Concepts and Configuration Configuring Switch Security Passwords Encryption Console Telnet / SSH Password Recovery MAC Address Flooding Spoofing Attacks CDP Attacks Telnet Attacks Security Tools Port Security Securing Console Access: Configuring Password Options Securing Virtual Terminal Access: There are 16 available default Telnet sessions as opposed to the 5 sessions set up for a router. Configuring Password Options Securing Privileged EXEC Access: Always use enable secret for password encryption. Configuring Password Options Encrypting Switch Passwords: You can encrypt all passwords assigned to a switch using the service password-encryption command. Configuring Password Options Password Recovery: To recover a switch password: Power up the switch with the Mode button pressed. Initialize flash. Load helper files Rename the current configuration file. Reboot the system. Reinstate the name of the configuration file and copy it into RAM. Change the password. Copy to start up configuration Reload the switch. Configuring Password Options A detailed password recovery procedure will be provided on Blackboard and in the lab. Login Banner: Message-Of-The-Day (MOTD) Banner: Login Banners Telnet: Most common method. Virtual Terminal application. Send in clear text. Not secure. Secure Shell (SSH): Virtual Terminal application. Sends an encrypted data stream. Is secure. Configure Telnet and SSH Configuring Telnet: Telnet is the default transport for the vty lines. No need to specify it after the initial configuration of the switch has been performed. If you have switched the transport protocol on the vty lines to permit only SSH, you need to enable the Telnet protocol to permit Telnet access. Configure Telnet and SSH Configuring Secure Shell (SSH): SSH is a cryptographic security feature that is subject to export restrictions. To use this feature, a cryptographic image must be installed on your switch. Perform the .

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