正解:D
Scrypt is safer than MD5, so answer A is wrong and answer D is correct
R1(config)#username user secret ? 0 Specifies an UNENCRYPTED secret will follow 5 Specifies a MD5 HASHED secret will follow 8 Specifies a PBKDF2 HASHED secret will follow 9 Specifies a SCRYPT HASHED secret will follow <0-9> Encryption types not explicitly specified LINE The UNENCRYPTED (cleartext) user secret LINE The UNENCRYPTED (cleartext) user secret
+ The enable password command should no longer be used. Use enable secret instead. username joeblow password mypass command should no longer be used. Use username joeblow secret mypass instead. + Type 4 Passwords should never be used! + Use Type 6, Type 8 and Type 9 wherever possible. + Type 0, Type 5 and Type 7 should be migrated to other stronger methods. Reference: https://community.cisco.com/t5/networking-documents/understanding-the-differences-between-the-cisco-password-secret/ta-p/3163238