DNS

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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