System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP)
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Naming Services: A Quick Comparison

DNS

NIS

NIS+

LDAP

NAMESPACE

Hierarchical

Flat

Hierarchical

Hierarchical

DATA STORAGE

Files/ resource records

2 column maps

Multi-columned tables

Directories [varied]

SERVER NAMES

Master/slave

Master/slave

Root master/non-root master primary/secondary cache/stub

Master/replica

SECURITY

None

None (root or nothing)

Secure RPC (AUTH_DH)

Authentication

SSL, varied

TRANSPORT

TCP/IP

RPC

RPC

TCP/IP

SCALE

Global

LAN

LAN

Global

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