Appendix D: Protocol Glossary
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NFS (Network File System)
A protocol that allows file sharing across a network. Users can view, store, and update files on a
remote computer. You can use NFS to mount all or a portion of a file system. Users can access
the portion mounted with the same privileges as the user's access to each file.
NIS (Network Information System)
System developed by Sun Microsystems for distributing system data such as user and host names
among computers on a network.
NMS (Network Management System)
NMS acts as a central server, requesting and receiving SNMP-type information from any computer
using SNMP.
NTP (Network Time Protocol)
A protocol used to synchronize time on networked computers and equipment.
PAP (Password Authentication Protocol)
A method of user authentication in which the username and password are transmitted over a
network and compared to a table of name-password pairs.
PPP (Point-to-Point Protocol)
A protocol for creating and running IP and other network protocols over a serial link.
RADIUS (Remote Authentication Dial-In User Service)
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.
SCP (Secure Copy Protocol)
A file transfer protocol that is similar to SFTP in that it uses SSH encryption and authentication, but
is slightly faster.
SFTP (SSH File Transfer Protocol)
Secure file transfer protocol over SSH Commands and data in transit are encrypted.
SMB/CIFS (Server Message Block/Common Internet File System)
: Microsoft's protocol for allowing all applications as well as Web browsers to share files across the
Internet. CIFS runs on TCP/IP and uses the SMB protocol in Microsoft Windows for accessing
files. With CIFS, users with different platforms and computers can share files without having to
install new software.
SNMP (Simple Network Management Protocol)
A protocol that system administrators use to monitor networks and connected devices and to
respond to queries from other network hosts.