Unit 4 Flashcards
What is the purpose of DNS?
Translate domain names into IP addresses
What three components make up DNS?
- Resolvers
- Resource Records
- Name Servers
What is any host or client on the internet needing to look up domain information
(can be software as well).
a Resolver
What entry in the DNS database contains information regarding the domain names?
Resource Records
Resource records are contained in files called ______
Zones
What are the name server roles?
(3)
- Primary name server (Master Name Server when sharing zone files)
- Secondary name server
- Caching-only name server
What zone in the DNS name space resolves a host name to an IP address?
Forward Lookup Zone
What zone in the DNS name space resolves IP addresses to host names?
Reverse Lookup Zone
A DNS query is also known as a _______
Lookup
What are the three types of DNS queries?
- Recursive Query
- Iterative Query
- Non-Recursive Query
What type of query occurs when a DNS client provides a host name and the DNS resolver “must” provide an answer?
Recursive Query
In a Recursive query which DNS server does the resolver start the query processes from?
Local DNS Server
What type of DNS query occurs when a DNS client provides a host name and the DNS
resolver returns the “best” answer it can?
Iterative Query
What type of DNS query occurs when a response is immediately returned to the client
because the record is stored in a local cache?
Non-Recursive Query
How many root domain name servers are there worldwide?
13
