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Appendix D: Protocol Glossary
NTP(NetworkTimeProtocol)
A protocol used to synchronize time on networked computers and equipment.
PAP(PasswordAuthenticationProtocol)
A method of user authentication in which the user name and password are transmitted over
a network and compared to a table of name-password pairs.
PPP(Point-to-PointProtocol)
A protocol for creating and running IP and other network protocols
over a serial link.
RADIUS(RemoteAuthenticationDial-InUserService)
An authentication and accounting protocol. Enables remote access servers to communicate
with a central server to authenticate dial-in users and their access permissions. A company
stores user profiles in a central database that all remote servers can share.
SNMP(SimpleNetworkManagementProtocol)
A protocol that system administrators use to monitor networks and connected devices and
to respond to queries from other network hosts.
SMTP(SimpleMailTransferProtocol)
TCP/IP protocol for sending email between servers.
SSL(SecureSocketsLayer)
A protocol that provides authentication and encryption services between a web server and a
web browser.
SSH(SecureShell)
A secure transport protocol based on public-key cryptography.
TACACS+(TerminalAccessControllerAccessControlSystem)
A method of authentication used in UNIX networks. It allows a remote access server to
communicate with an authentication server to determine whether the user has access to the
network.
Telnet
A terminal protocol that provides an easy-to-use method of creating terminal connections to
a network host.