Route 53

Question 1

What is DNS?

Answer 1

Convert human friendly domain names to ip addresses

Question 2

Which does Route 53 support - IPV4 or IPV6?

Answer 2

Supports both IPV4 and IPV6

Question 3

What is the Top level domain?

Answer 3

The last word in the domain name

Question 4

Who controls top level? Who controls below top level?

Answer 4

ICANA, domain registrar

Question 5

What is TTL?

Answer 5

Length of time DNS record is cached e.g. a domain name can switch pointing to a diff ip

Question 6

What is a SOA?

Answer 6

Start of Authority contains all the different types of DNS records, start of DNS

Question 7

What is an A record?

Answer 7

Basic DNS record, mapping of domain name to ip

Question 8

What is a CNAME?

Answer 8

Record mapping one domain name to another

Question 9

What is an Alias Record?

Answer 9

AWS specific, works like CNAME, mapping resources in aws hosted zones to AWS resources.

Question 10

What records can be used with naked domain names? (zone apex record) and what can’t?

Answer 10

CNAME cannot be used with naked domain name

A records and Alias records can

Question 11

Between a CNAME and Alias record which should you choose?

Answer 11

Choose Alias Record

Question 12

What is a NS Record?

Answer 12

A Name Server record directs traffic from top level domains to the SOA where all the DNS records are

Question 13

What is simple routing policy? How are ip’s returned? Can you have a healthcheck? ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 13

Only have one record maps to multiple ip addresses. IP’s are returned in a random order
No healthcheck can be done
A single record set

Question 14

What is weighted routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 14

Splits traffic based on weights assigned. (e.g. different regions)
Yes can configure healthcheck
Create mutliple record sets each with different weights and healthchecks

Question 15

What is a health check in Route53?

Answer 15

Can be set for individual record sets. Record set will be removed until it passes the health check. SNS compatible

Question 16

What is failover routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 16

It is an active/passive setup using health checks, where 1 record set is the primary pointing to ip (e.g. region), and another record is a secondary pointing to a diff ip (e.g. diff region). Fails over to the secondary if the primary record fails the healthcheck

Question 17

What is geolocation routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 17

Traffic is sent based on location of users for e.g. localization, directing to different region.
You can use healthchecks.
You create a record set for each region.

Question 18

What is geoproximatiy routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 18

Available only with route 53 Traffic Flow, direct traffic based on user/resource location and bias (shrinks/expands geo regions).
N/A
N/A

Question 19

What is latency routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 19

Direct traffic based on lowest network latency for end user (fastest response time) e.g. direct to fastest region
Create 1 Recordset per each region.
Health checks can be used

Question 20

What is multivalue answer routing policy? How are ip’s returned? Can you have a healthcheck? How many record sets do you create?

Answer 20

Route 53 returns multiple values (multiple ips). Can check health of each resource and returning healthy only ips.
Like simple routing but with healthchecks.
Yes Healthchecks are used
You create 1 recordset for each healthcheck. 1 record set points to ip address in 1 particular region