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Password Authentication Protocol
An authentication protocol that allows Point-to-Point Protocol (PPP) peers
to authenticate one another. The remote router attempting to connect to the
local router is required to send an authentication request. Unlike Challenge
Handshake Authentication Protocol (CHAP), PAP passes the password and host name
or username in the clear (unencrypted). PAP does not itself prevent
unauthorized access, but merely identifies the remote end. The router or access
server then determines if that user is allowed access. PAP is supported only on
PPP lines. Compare with CHAP.
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