What are the cracking modes supported by John the Ripper?

What will be an ideal response?

John the Ripper supports several modes for cracking passwords:* The wordlist mode is the simplest mode supported by John the Ripper and compares passwords against a list of words in a text file.* The single-crack mode is faster than the wordlist mode, and it uses logon or GEOCS information for cracking passwords. It limits the cracking process to the accounts related to the logon information. If more than one user has the same password, it repeats the comparison of guessed passwords.* The incremental mode is the most powerful mode used by John the Ripper. It attempts all possible combinations of letters, numbers, and special characters as passwords. This mode is used for conducting brute-force attacks.* The external mode is the user-defined mode. An external mode may be defined by using the section [List.External: Mode] in the john.ini file. Here, mode is the name of the external mode. You can use an external mode to specify customized functions for trying passwords. You should add these functions to the [List: External: Mode] section.