Why passwd for CHAP must be the same while for PAP its not mandatory ?

Hi,
want to ask a question in WAN about PAP/CHAP.
why passwd for CHAP must be the same between routers  while for PAP its not mandatory ?
regards

By default, much of this type of checking is performed for you. Read the available checks in {font:Courier}/usr/share/doc/pam-0.99.6.2/txts/README.pam_cracklib{font} and then decide if these are sufficient.
Note that some checks are not enabled by default, You can tune them by editing the {font:Courier}/etc/pam.d/system-auth{font} file:
# /bin/fgrep /etc/pam.d/system-auth
password    requisite     pam_cracklib.so try_first_pass retry=3and tinkering with the command line arguments there.

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