Cisco CCENT Tutorials

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Setting Strong Encrypted Passwords On Cisco Devices - Part 1 of 3 There are a number of different Cisco IOS features that use passwords. By default, Cisco IOS stores all password values (except those specified as secret) in the configuration as cleartext. This is a security issue as anyone can do an over-the-shoulder attack when passwords are not encrypted. By enabling the service password-encryption global configuration command, Cisco IOS obfuscates all cleartext passwords (Type 0) with a Vigenère cipher (Type 7). While Type 7 passwords are easily decrypted, this feature greatly reduces the effectiveness of the over-the-shoulder attack. Certain passwords allow you the option to designate them as secret passwords. The best known example of this is the enable secret password. Cisco IOS stores secret passwords in the form of an MD5 hash. (Type 5). While MD5 can technically be cracked, its not something that can be done easily (if at all). Type 5 passwords are very secure. You can quickly tell whether a password is stored in cleartext (Type 0), MD5 hash (Type 5), or Vigenère cipher (Type 7) by looking at the number that precedes the password when viewing the configuration.

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Visit www.thebryantadvantage.com and http for hundreds of other tutorials and videos! In this CCNA 5-minute practice exam, you'll be tested on your Frame Relay knowledge. Full answers and explanations are then shown on real Cisco routers. Enjoy! Chris Bryant CCIE #12933 "The Computer Certification Bulldog" chris@thebryantadvantage.com

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How to create a VLAN on a Cisco Switch @ www.3citraining.com