what is a route53 hosted zone?

A DNS database for a domain, e.g. animals4life.io

• It’s what the DNS system references for a domain.
• In other words, hosted zone is the Authoritative nameserver of a domain.

how many nameservers does a public hosted zone have?

4 Route53 nameservers

what is the accessibility of a r53 public zone?

A R53 Public Zone can be accessed from:

• the public internet
• AWS VPCs.

for a public hosted zone, what is the dns query process of the aws vpc?

• VPC Instances are configured with the VPC +2 Address (R53 Resolver).
• Any resources in the VPC can query public DNS and R53 Public Hosted Zones record.

what is the accessibility of a r53 private hosted zone?

A R53 Private Hosted Zone can only be accessed by the VPCs (which with it is associated).

• These VPCs can be from the same account or different accounts.
• The public internet cannot access R53 Private Hosted Zones.

what is r53 split-view dns?

Using the same domain name (example.com) for

• internal uses (accounting.example.com)
• external uses, such as your public website (www.example.com)

Or even using the same sub-domain for both public (external) and internal usage.

what is `cname` record?

A CNAME record:

• maps DNS queries for the name of the current record, such as acme.example.com
• to:
  • another domain (example.com or example.net)
  • or subdomain (acme.example.com or zenith.example.org).

what is `alias` record?

Amazon Route 53 alias record is a Route 53–specific extension to DNS functionality.

what does r53 `alias` record do?

R53 alias record:

• route traffic to selected AWS resources, such as

  • CloudFront distributions
  • Amazon S3 buckets.

• route traffic from one record in a hosted zone to another record.

why use r53 `alias` record?

• Unlike a CNAME record, we can create an R53 alias record at the top node of a DNS namespace, also known as the zone apex.

  e.g. DNS name example.com:

  • We can’t create a CNAME record for example.com
  • But we can create a R53 alias record for example.com that routes traffic to www.example.com.

• We can use a R53 alias record to route traffic to many AWS resources.

  Many AWS resources don’t have a static IP address. They only have a DNS name, e.g. lb1-1234.us-east-1.elb.amazonaws.com

  With R53 alias record, we can route directly traffic to these DNS name, without allocating an additional Elastic IP address.

what is r53 `simple routing`?

Routing traffic to a single resource, for example, to a web server for your website.

what is the drawback of r53 `simple routing`?

Simple Routing doesn’t support health check.

what is `failover routing`?

Routing traffic

• to a resource when the resource is healthy
• or to a different resource when the first resource is unhealthy

can r53 `simple routing` return multi values?

Yes.

what is the different between `simple routing` and `multi value routing`?

• With Simple Routing, a hosted zone can have a record that have multi values.
• With Multi Value Routing, a hosted zone can have multiple records with the same name

what is weighted routing?

Associating multiple resources with

• a single domain name (example.com)
• or subdomain name (acme.example.com) and

and choose how much traffic is routed to each resource.

what is latency-based routing?

Routing traffic to the AWS Region that provides the lowest latency.

what is geolocation routing?

Routing traffic based on the geographic location of users:

• to localize content
• to restrict distribution of content
• …

what is geoproximity routing?

Routing traffic based on the geographic location of users and our resources.

A ‘bias’ can be applied to expand/shrink the size of the geographic region.

compare `latency-based routing` - `geolocation routing` - `geoproximity routing`?