Route 53 Flashcards
What is the name for AWS’s DNS server?
Route 53?
Why is it called route 53?
It is on port 53
What does Route 53 do?
It sends users to different IP addresses based on human friendly domain names
What is a top level domain?
last word in domain name. Example, .com, .edu, etc
What is a second level domain name?
second word in domain name. Example, .co.uk (uk is second level domain name)
Who is the Internet Assigned Numbers Authority? (IANA)
They host a DB of all available top level domains
What is a domain registrar?
Authority that can assign domain names directly under one or more top level domains. Example, GoDaddy, Amazon
What is contained in a Start of Authority Record (SOA)
Name of server that supplied data for zone, admin for zone, default number of seconds for TTL
Name Server (NS) Records
used by top level domain servers to direct traffic to content DNS server which contains authoritative DNS records
A Record
fundamental type of DNS record. These translate name of domain into an IP address. (A stands for address)
TTL (Time to Live)
length that a DNS record is cached on either resolving server or users own local PC
CName
used to resolve one domain name to another. Stands for Canonical name
True or False: CNAMEs must be for A record or alias
True
Alias Record
map resource record sets in your hosted zone to ELBs, Cloudfront distributions or S3 buckets that are configured as websites
Simple Routing Policy
Only one record but can have multiple IP addresses. Route 53 will return IP addresses in random order if you specify multiple values. No health checks
Weighted Routing Policy
Split traffic based on different weights assigned. Ex 10% of traffic to US East 1 and 90% of traffic to US West 1
Latency Routing Policy
Route traffic based on lowest network latency for your end user.
Failover Routing Policy
Used is you want a primary site and a DR site if the primary site fails a health check
Geolocation Routing Policy
Route traffic based on geographic location of your users (location from which DNS queries originate). Good if you want to update the language or currency on a site based on the country the user is in
Geoproximity Routing (Traffic Flow Only)
Route traffic to resource based on geographic location of your users and your resources and you can optionally choose to route more or less to a given resource by specifying a bias. Traffic policies allow you to put in a latitude and longitude and assign it a bias
Multivalue Answer Policy
Same as simple routing policy except you can assign health checks
How do you resolve to a ELB?
Using a DNS name. Specifically, you should create a CNAME record
Is there a limit to the number of domain names in an AWS account and if so what is it?
Default limit is 50 domain names but this can be increased by AWS support