Section 7: Route 53

Question 1

You have purchased “mycoolcompany.com” on the AWS registrar and would like for it to point to lb1-1234.us-east-2.elb.amazonaws.com . What sort of Route 53 record is NOT POSSIBLE to set up for this?
A) CNAME
B) Alias

Answer 1

A) CNAME

The DNS protocol does not allow you to create a CNAME record for the top node of a DNS namespace (mycoolcompany.com), also known as the zone apex

Question 2

You have deployed a new Elastic Beanstalk environment and would like to direct 5% of your production traffic to this new environment, in order to monitor for CloudWatch metrics and ensuring no bugs exist. What type of Route 53 records allows you to do so?

A) Simple
B) Weighted
C) Latency
D) Failover

Answer 2

B) Weighted

Weighted allows you to redirect a part of the traffic based on a weight (hence a percentage). It’s common to use to send a part of a traffic to a new application you’re deploying

Question 3

After updating a Route 53 record to point "myapp.mydomain.com" from an old Load Balancer to a new load balancer, it looks like the users are still not redirected to your new load balancer. You are wondering why...
A) it's because of the alias record
B) it's because of the CNAME record
C) it's because of the TTL
D) it's because of the health checks

Answer 3

C) it’s because of the TTL

DNS records have a TTL (Time to Live) in order for clients to know for how long to caches these values and not overload the DNS with DNS requests. TTL should be set to strike a balance between how long the value should be cached vs how much pressure should go on the DNS.

Question 4

You want your users to get the best possible user experience and that means minimizing the response time from your servers to your users. Which routing policy will help?
A) Multi Value
B) Weighted
C) Latency
D) Geo Location

Answer 4

C) Latency

Latency will evaluate the latency results and help your users get a DNS response that will minimize their latency (e.g. response time)

Question 5

You have a legal requirement that people in any country but France should not be able to access your website. Which Route 53 record helps you in achieving this?
A) Latency
B) Simple
C) Geolocation
D) Multi Value

Answer 5

C) Geolocation

Question 6

You have purchased a domain on Godaddy and would like to use it with Route 53. What do you need to change to make this work?
A) Request for a domain transfer
B) Create a private hosted zone and update the 3rd party registrar NS records
C) Create a public hosted zone and update the Route 53 NS records
D) Create a public hosted zone and update the 3rd party registar NS records

Answer 6

D) Create a public hosted zone and update the 3rd party registar NS records

Private hosted zones are meant to be used for internal network queries and are not publicly accessible. Public Hosted Zones are meant to be used for people requesting your website through the public internet. Finally, NS records must be updated on the 3rd party registrar.