Route53

Question 1

Does Route53 require region selection?

Answer 1

No

Question 2

What is an A record?

Answer 2

Is the fundamental type of DNS record (A stands for Address). Translates a domain name to an its IP address.

Question 3

What is a CNAME record?

Answer 3

Canonical Name. It’s a record that can be used to resolve one domain name to another.

Question 4

What is an Alias record?

Answer 4

Alias records are an Amazon Route 53-specific extension to DNS. You can create alias records to route traffic to selected AWS resources.

Alias record typically have a type of A or AAAA, but they work like a CNAME record. Using an alias record, you can map your record name (example.com) to the DNS name for an AWS resource(elb1234.elb.amazonaws.com). Resolvers see the A or AAAA record and the IP address of the AWS resource.

Question 5

How do you find the IP address for an ELB?

Answer 5

ELB’s do not have pre-defined IPv4 addresses, you resolve to them using a DNS name.

Question 6

Which one will be preferred “always”? A CNAME or an Alias record?

Answer 6

Always choose an Alias record over a CNAME

Question 7

How can you map a naked domain name (zone apex) to an ELB?

Answer 7

Using an Alias Record, which allows to resolve a naked domain name (a zone apex record) to an ELB DNS address.

Question 8

Are there charge differences between CNAMES and Alias record?

Answer 8

Yes. CNAMEs are charged, Alias records are free.

Question 9

What is the first step of using Route53?

Answer 9

Create a Hosted Zone

Question 10

What are the available routing policies in Route53?

Answer 10

Simple Weighted Latency Failover Geolocation

Question 11

How does the Weighted routing policy work?

Answer 11

Weighted Routing Policies let you split your traffic between regions based on different weights (traffic percentages) assigned (ex: 30% to US-EAST-1, 70% to US-WEST-1)

Question 12

How does the Latency routing policy work?

Answer 12

Latency based routing allows you to route your traffic based on the lowest network latency for your end user (i.e. which region will give them the fastest response time)

Question 13

How does the Failover routing policy work?

Answer 13

Failover routing policy are used when you want to create an active/passive set up (Route53 will monitor the health of the primary site using a health check)

Question 14

How does the Geolocation routing policy work?

Answer 14

Geolocation routing lets you choose where your traffic will be sent based on the geographic location of your users.

Question 15

Does Route53 supports MX records?

Answer 15

Yes (A, CNAME, MX, NS, SOA,…, AAAA, NAPTR, PTR, SPF, SRV and TXT)

Question 16

Why is Route53 named so?

Answer 16

The DNS port is 53

Question 17

Does Route53 support zone apex records? (naked domain names)

Answer 17

Yes

Question 18

Is there a limit in the number of domain names that you can manage using Route53?

Answer 18

There is a soft limit of 50 domain names, however this limit can be raised by contacting AWS support.

Question 19

How long can it take to register a domain?

Answer 19

up to 3 days

Question 20

How does a simple routing policy work?

Answer 20

one record with multiple IP’s. R53 will randomly return values

Question 21

Can you resolve an ELB by IP address?

Answer 21

No, it will always be a DNS name

Question 22

What happens if a record fails a health check?

Answer 22

record will be removed until it passes