DNS

Question 1

What four events trigger a zone transfer?

Answer 1

• The initial transfer occurs when a secondary zone is created.
• The zone refresh interval expires.
• The DNS Server service is started at the secondary server.
• The master server notifies the secondary server that changes have been made to a zone.

Question 2

What are the three types of zone transfers?

Answer 2

• Full transfer (AXFR)
• Incremental transfer (IXFR)
• DNS Notify

Question 3

What are the 3 zone transfer settings?

Answer 3

• To any server: Allows a data transfer to any server that asks for a zone transfer (least secure).
• Only to servers listed on the Name Servers tab: Restricts zone transfers to secondary DNS servers as defined with NS resource records.
• Only to the following servers: Restricts zone transfers to those servers specified in the accompanied list.

Question 4

What does a transfer from master mean for a secondary zone?

Answer 4

• Transfer from Master: Determines whether the local secondary zone serial number has expired and then pulls a zone transfer from the master server.

Question 5

What does reload from master mean in a secondary zone?

Answer 5

• Reload from Master: Performs a zone transfer regardless of the serial number in the secondary zone’s SOA resource records.

Question 6

What 6 tasks can dnscmd allow you to do?

Answer 6

• Create, delete, and view zones and records
• Reset server and zone properties
• Perform zone maintenance operations, such as updating the zone, reloading the zone, refreshing the zone, writing the zone back to a file or to Active Directory, and pausing or resuming the zone
• Clear the cache
• Stop and start the DNS service
• View statistics

Question 7

What command is used to view zones on a dns server?

Answer 7

dnscmd server1.contoso.com /enumzones

Question 8

What is a Zone delegation?

Answer 8

A DNS child zone hosted on another server for performance

Question 9

What is a stub zone?

Answer 9

Hosts name server, resource and A records for the authoritative name servers without going to the root domain servers