This MIB module defines objects describing users
authenticated locally by a Network Access Server (NAS).
        
    +--------+      +--------+        +---------+
    |        |      |        |        |         |
    | Client |<---->| Server |<------>| Network |
    |        |      |  (NAS) |        |         |
    +--------+      +--------+        +---------+
        
        
A client is a telnet or SSH user needing access to the NAS
box directly. Network user like PPP or dot1x will request
NAS box for authentication to access the network. 
        
NAS box authenticates user present in the local user 
database.
        
GLOSSARY
        
Network Access Server ( NAS )    
A single point of access to a remote resource and is
exclusively used with Authentication, Authorization
and Accounting. 
        
Point-to-Point Protocol (PPP)
A data link protocol commonly used in establishing a
direct connection between two networking nodes.