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

DNS

NIS

NIS+

FNS

LDAP

NAMESPACE

Hierarchical

Flat

Hierarchical

Hierarchical

Hierarchical

DATA STORAGE

Files/ resource records

2 column maps

Multi-columned tables

Maps

Directories [varied]

SERVER NAMES

Master/slave

Master/slave

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

N/A

Master/replica

SECURITY

SSL

None (root or nothing)

DES Authentication

None (root or nothing)

SSL

TRANSPORT

TCP/IP

LAN

LAN

LAN

TCP/IP

SCALE

Global

LAN

LAN

Global (w/ DNS)/LAN

Global