DNS
Queries
Iteration
Client must query multiple servers for address
Recursive
Dns Server makes queries on Cilents behalf
Records
Service location (SRV)
srv aware apps search for servers
AD is a SRV aware app
Pointer (PTR)
only used in Reverse lookup zones
Mail Exchanger (MX)
when specifying 2 or more, lower number is a higher priority
used by email apps to locate mail server
Alias (CNME)
usefull if server is changed
point to same host with 2 names
Host (A)
Forward or Reverse
Can update dynamicly with XP, 2000 or server 2003
Most common
Zones
Cashing only servers
Good to minimise NW traffic over a WAN
no zone, only cash previously resoved queries
Active Directory Intergrated Zone
All Domain Servers can host a Primary Zone
Fault Tolerent
Multiple Primary read/write (primary) copies of Zone Data
Standard Zone
Reverse Lookup Zones
IP to FQDN mapping
Stub Zone
only records pointing to Authoritative servers
Secondary Zone
master can be Primary or secondary
Read only
Authorative
Primary Zone
Authoriative
Only one read/write copy of data
