Route 53 Flashcards
What is an alias record used for on Route 53?
While ordinary Amazon Route 53 records are standard DNS records, alias records provide a Route 53–specific extension to DNS functionality. Instead of an IP address or a domain name, an alias record contains a pointer to a CloudFront distribution, an Elastic Beanstalk environment, an ELB Classic, Application, or Network Load Balancer, an Amazon S3 bucket that is configured as a static website, or another Route 53 record in the same hosted zone.
What is a CNAME?
A CNAME, or canonical name, is used to resolve one domain name to another. For example a mobile site for www.domain.com can be given the CNAME of mobile.domain.com.
How are Elastic Load Balancers resolved (IP address or domain name)?
An ELB is always resolved using DNS, you will never be given an IP address for an ELB.
What is the difference between a CNAME and an Alias?
A CNAME (or canonical name) resolves one DNS entry to another, for example foo.domain.com to bar.domain.com. An alias record can only point to a CloudFront distribution, an Elastic Beanstalk environment, an ELB load balancer, an Amazon S3 bucket that is configured as a static website, or another record in the same Route 53 hosted zone in which you’re creating the alias record.
what is the function of a simple simple Route 53 routing policy?
This is the default routing policy when you create a new record set. It is most commonly used when you have a single resource that performs a specific function for your domain - for example a web server serving a website.
What is weighted routing used for?
This is used to send traffic to different endpoints based on a weight given to each (from 1-255) - for example, if you have 2 sites and weight site one at 75 and site two at 25 then 75%of your traffic will go to site one
What is latency based routing used for?
Latency based routing selects the route for traffic to a site based on current network latency and sends traffic to the endpoint with the least current latency.
What is failover routing used for?
Failover routing sends traffic to either a primary site or secondary site based on the status of a health check. The health check will be on the primary site, if this fails traffic will be sent to the secondary site.
What does geolocation based routing do?
It allows you to route requests based on where the route 53 query comes from geographically.
