DNS

Question 1

What is DNS?

Answer 1

Converts human-friendly domain names into an internet IP address

Question 2

Why Route 53?

Answer 2

The DNS service in Amazon is called route 53, it’s a play on route 66, and 53 is the port for DNS.
It is a global service

Question 3

route policies on AWS?

Answer 3

simple routing
weighted routing
latency based routing
failover routing
geolocation routing
multivalue answer routing

Question 4

What is simple DNS routing policy ?

Answer 4

1 record with multiple ip addresses, so a query returns one of the multiple ip addresses at random.

Question 5

What is weighted DNS routing policy ?

Answer 5

We can specify a weighting for DNS resolution, you would consider doing this if you have DNS servers in the USA and Europe, but 90% of your business comes from the USA. IN which case you want the majority of your traffic to go the USA IP.

Question 6

What is Latency based DNS routing?

Answer 6

This allows you to route your traffic to the based on the lowest network latency for your end user.

Question 7

What is failover DNS routing ?

Answer 7

This is used when you want an active/passive setup. AWS monitors your active via a health check.

Question 8

What is geolocation DNS routing ?

Answer 8

This is used when you want your traffic sent to a certain site based on the geographic location of the end user.

Question 9

What is multivalue answer routing ?

Answer 9

This is used when you have multiple resources assigned to a DNS value. AWS 53 gives a different answer to anyone that queries the DNS name. However, you can leverage health checks to ensure that only healthy hosts are viable targets for the query.