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42 Cards in this Set
- Front
- Back
How does Dynamic DNS (DDNS) differ from standard DNS?
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DDNS allows real-time DNS updates
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What command will send DNS registration info to a DNS server?
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ipconfig /registerdns
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How is DNS information replicated in DDNS?
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through Active Directory
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How was DNS information replicated in standard DNS?
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through manual copies of the zone file
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What two name resolution technologies does DDNS cover?
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DNS and WINS
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When does DDNS update the record?
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when a client leases an IP address
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What is Scope Option 003?
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default gateway
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What is Scope Option 006?
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preferred DNS server
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What is the scope for default gateway?
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003
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What is the scope for preferred DNS server?
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006
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Where does non-dynamic DNS store data?
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in a text file located at %SystemRoot%\System32\DNS
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What are the 3 types of DNS zones?
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primary, secondary, and stub zone
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What is a primary DNS zone?
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a DNS zone which stores a copy of the zone that can be directly updated
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What is a secondary DNS zone?
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a copy of a primary DNS zone
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What are secondary DNS zones used for?
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load balancing, fault tolerance, and increasing capacity
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What is a DNS stub zone?
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a copy of a DNS zone containing only NS, SOA, and sometimes glue A records; it is not authoritative
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What limitation exists on a DNS server storing its data in AD?
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the DNS server must be a DC
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What is secure DNS?
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a DNS system where updates occur over a secure channel
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How does secure DNS work?
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when a DNS transfer is initiated, the DNS server verifies that the DNS server sending the update is on an approved list
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What is the purpose of secure DNS?
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to prevent poison entries
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How is secure DNS set up in an Active Directory domain?
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it is set up automatically
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What are 3 reasons to use a stub zone?
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keep delegated zone info current, improve name resolution, simplify administration
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What does a Start of Authority (SOA) record do?
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specifies the DNS server in charge of a zone
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What 4 items does an SOA record specify?
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primary server for the zone, zone administrator's email address, secondary zone expiration values, minimum default TTL values
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What is the Global Name Zone designed to do?
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replace WINS
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What is an A record?
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address record
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What 3 types of records are stored in a Forward Lookup Zone?
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LDAP, Global Catalog, and Name Server records
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How can repopulation be forced if a Forward Lookup Zone does not appear in AD?
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use net stop logon and net start logon
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What do Forward Lookup Zones do?
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store domain name-to-IP address mappings
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What do Reverse Lookup Zones do?
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store IP address-to-domain name mappings
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At what 3 times are Reverse Lookup Zones populated?
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when IP addresses are leased, when machines are restarted, when ipconfig /registerdns is executed
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What do root hints do?
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provide a link between DNS servers and top-level DNS servers
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What are 3 reasons to divide namespaces into more than 1 zone?
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delegate responsibility, break up large namespaces for management, extend namespace to add subdomains
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When creating subdomains, what needs to be done to make sure that all zone records stay current?
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delegation records need to be added to other DNS servers to point to the authoritative server
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How does round robin DNS work?
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when an IP address for a server in a round robin pool is given out, that address is moved to the bottom of the list
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What sort of servers most often utilize round robin DNS?
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web servers
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What is recursion?
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forwarding requests to other servers for fulfillment
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When is DNS recursion usually disabled?
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When the network is sensitive
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What is server scavenging?
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process of getting rid of stale DNS records
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What 2 containers are created when DNS is integrated with AD?
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forestDNSzone and domainDNSzone
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What do incremental zone transfers do?
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replicate only changes to DNS (rather than all records)
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Does DNS work on a push or pull basis?
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pull: when changes are made, the DNS server notifies other servers that changes are available
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