Domain Name System (DNS) Flashcards
Helps network clients find a website using human readable hostnames instead of numeric IP addresses. With this, its easier for people to remember Dion Training.com than 64.666.679 or any long IP address.
Domain Name System (DNS)
A domain name that is under a top-level provider like .com or .net
Fully Qualified Domain Name
Determines what the domain name is for a given IP address
Reverse DNS Lookup
Uses DNS to find the given IP address for a given domain name
Forward Lookup
Allows cloud instances on the same network address each other using internal DNS names instead of using IP addresses
Internal DNS
Records created around the domain names from a central authority and used on the public Internet
External DNS
Both internal and external DNS has (blank) , which tells the DNS resolver how long to cache a query before requesting a new one
Time to Live of TTL
Makes a local copy of every DNS entry it resolves as you connect to websites
DNS Resolver/DNS Cache
When the DNS Resolver doesn’t know what the domain’s IP is, but it will ask the DNS server and that server will hunt it down until it finds it
Recursive Lookup
Each DNS server responds directly to the client with an address for another DNS server that may have the correct IP address. This type of lookup involves one server not knowing the correct IP address, so it recommends asking the next server for the correct IP address.
Iterative Lookup
Type of DNS server that stores all the DNS records for a given domain
Name Server
Sends DNS records data from the primary name server to a secondary name server. This uses the TCP protocol
Zone Transfer
translates human readable domain names (for example, www.amazon.com) to machine readable IP addresses (for example, 192.0.2.44).
Domain Name System (DNS)
