Six Sigma is a methodologyâ This view of Six Sigma recognizes the underlying and rigorous approach known as DMAIC (define, measure, analyze, improve and control).
E-mail protocols [edit]. The Internet Message Access Protocol is an Application Layer Internet protocol that allows an e-mail client to access e-mail on a remote mail server. The current version, IMAP version 4 revision 1 (IMAP4rev1), is defined by RFC 3501. An IMAP server typically listens on well-known port 143.
PPP, the standard protocol for communicating across point-to-point links, includes an optional authentication stepâthe point at which the AAA element is introduced. During this authentication phase, protocols such as the Challenge Handshake Authentication Protocol (CHAP) can be used to identify the client to the PEP.