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42 Cards in this Set

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