What does DNS do?
Acts as an internet lookup phone book, converts human-friendly domain names into an IP address.
What are the two types of IP addresses
IPv4 and IPv6
What is IPv4
32-bit field
What is IPv6 and why is it now needed
its 128-bit field and has mannnny more addresses available. 340undicillion addresses. (34e10+37)
What is TLD
top level domain name, such as .com, .edu, .co.uk ets
What part of .co.uk is the second-level domain name
.co (1st is most right)
What is a Domain Registrar?
authority that can assign domainname, registered under InterNIC, a service on ICANN
what is WhoIS
the central database where domain names are generated
What is an SOA record
stores info about:
name of server
the administrator of the zone (contact details)
Other info as well
what is NS record
Name Server Record
What are NS records used for?
TLD server to direct traffic to the content DNS server with contains the authoritative DNS.
What is A record
fundamental DNS record (A stands for address) translates name of domain to IP address
Do ELBs have an IPv4 or IPv6 address?
neihter, just a DNS name
TTL?
Time To Live - How long cached addresses for DNS requests can live for (in seconds) before it makes another request.
What is a CName
A Canonical Name. Can be used to resolve one domain name to another.
What is an Alias record? (AWS only)
similar to CName. Maps resources set in you hosted zone to ELBs, CloudFrost distros, or S3 buckets. AND can be used for automatically maps to naked doimain name and elastic IP addresses.
Given the choice between Alias record or CNAME, what do you ususally choose?
Alias Record
Simple Routing Policy
Default. Single resource that performs a diven function for your domain. rout53 forwards request to the service (like a server for eg)
Weighted Routing Policy
Routes requests to multiple resources based on percentage of requests. Good for A/B testing.
Latency Routing Policy
Routes traffic based on lowest network latency for your end user (fast response time!)
When creating Health Checks on a failover policy, what target domain name should be avoided by the health check
the domain name for the health check cannot be the same as the primary/secondary domain for which you are trying to associate. Maybe use an EBS domain name instead.
When creating Health Checks on a failover policy, what target domain name should be avoided by the health check
the domain name for the health check cannot be the same as the primary/secondary domain for which you are trying to associate. Maybe use an EBS domain name instead.
Geolocation Routing Policy
Route based on location of the users location (ie for regional language based sites)
In Selecting a Geolocation Routing Policy, what is “Default”
Everywhere else
use case for simple routing
singe web server
use case for weighted policy
A/B testing,
use case for latency
Giving users highest performance
failover use case.
production and DR site and DR site only comes in when production is down
geolocation use case
maybe show currency differently within websites
What is the limit for the number of domain names you can manage through route53, if any?
50, but a soft limit and can be raised
What is Amazon Route53 Traffic Flow
easy-to-use and costseffective global trafic managment service that routse users to multiple endoipnts based on latency, geography, ande endpoint health.
What is billed in a policy record
The creation. Each policy record you create you are billed for.
How can you use the same policy to manage routing for more than one DNS name without getting additional bills
you can add a CNAME record for each additional DNS name and point it to the DNS with the managed policy
What record are you looking for when finding the administrator of the zone that supplied infor about a domain (ie who owns the domain(
SOA record
