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05 - DNS Tutorial Overview.
Promoting the secondary DNS to primary DNS server
Despite the fact that a secondary nameserver automatically copies its information from the primary, the DNS does not differentiate between primary and secondary nameservers. More-or-less, they are used equally whenever a domain name lookup is performed. These Secondary servers are equally necessary as the primary DNS servers. Mitigation of the load over the primary DNS server is handled by the Secondary servers as well.

Changing zone types from (secondary) to (primary)
Changing a zone from secondary to primary can affect other zone activities, including the management of dynamic updates and zone transfers and the use of DNS notify lists to notify other servers about changes in the zone. You can perform this procedure by using the DNS snap-in or by using the Dnscmd command-line tool.

Promoting the primary DNS to secondary DNS server
The terms 'primary' and 'secondary' may not mean what common usage suggests... depending on the DNS client side, DNS resolution requests may be sent (first) to the DNS server that most recently responded, or it may be sent to both or all configured DNS servers [some clients may allow more than 2 to be specified...] and the first reply received is considered the 'winner' The secondary DNS server is referred as the Slave server.

Changing zone types from (primary) to (secondary)
Before you use these options, you must first convert the zone to the appropriate type, if necessary. The DNS Server service provides for three types of zones: Primary zone, Secondary zone, Stub zone. If the DNS server is also an Active Directory Domain Services (AD DS) domain controller, primary zones and stub zones can be stored in AD DS


DNS Quiz Questions.

  1. Which network ports must be open between external and internal DNS servers for external name resolution to function properly?

    53/tcp and 135/tcp
    53/udp and 139/tcp
    53/tcp and 53/udp
    53/udp and 135/tcp


  2. You want to ensure that DNS zone content is always accurate. You employ dynamic DNS, and you are concerned that many clients may not be deregistering accurately. What should you do to address this concern?

    Verify content of the zones weekly.
    Configure DNS scavenging.
    Periodically re-import zones from an export that contains server records only.
    Configure DHCP to remove DNS entries when leases expire.


  3. You configured a DNS zone on the primary server and now would like to set up a transfer to a secondary server. However, during secondary zone initiation on another server attempts to load the zone consistently fail. What should you do to correct the problem?

    Allow zone transfers to servers listed in the Name Servers tab (Zone Transfer tab in zone properties) and add the secondary server to the NS of the zone.
    Allow zone transfers to selected servers (Zone Transfer tab in server properties).
    Uncheck the "Secure cache against pollution" option.


  4. Your DNS zones are configure as AD-integrated. You must ensure that regular users are not allowed to write to zones. What should you do?

    Configure all servers as secondary.
    Secure zones against pollution.
    Do nothing, as Authenticated Users already have read-only access.
    Remove Authenticated Users from the Zone Security tab.


  5. You want to ensure that DNS zone content is secured and that no user can write to DNS zones. How should you configure your zones?

  01 - Installing and setting up the first DNS server 2008 R2 - Creating forward lookup zones and zone type (standard primary) - Creating the first host (A) record for the first DNS server


  02 - Creating reverse lookup zones and zone type (standard primary) - Creating the first pointer (PTR) record for the first DNS server - Testing the first DNS server by running a (simple query)


  03 - Installing and setting up the second DNS server 2008 R2 - Connecting to the primary DNS from the DNS manager - Creating forward lookup zones and zone type (standard secondary)


  04 - Creating reverse lookup zones and zone type (standard secondary) - Transferring the DNS records from primary to secondary zones - Verifying the DNS client configuration on Windows 7


  05 - Promoting the secondary DNS to primary DNS server - Changing zone types from (secondary) to (primary) - Promoting the primary DNS to secondary DNS server - Changing zone types from (primary) to (secondary)

05 - DNS Diagram Tutorial







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