AWS Route 53

Question 1

What is Route 53?

Answer 1

Route 53 is a Domain Name Service (DNS) that allows domain registration, management of record sets, complex traffic flows, health checks, and resolving VPC traffic outside of AWS.

Question 2

What is a Hosted Zone in Route 53?

Answer 2

A Hosted Zone is a container for record sets, scoped to route traffic for a specific domain or subdomains.

Question 3

What are the types of Hosted Zones?

Answer 3

Public Hosted Zone: Handles inbound traffic from the internet. Private Hosted Zone: Handles traffic within an Amazon VPC.

Question 4

What are the action types for modifying record sets in Route 53?

Answer 4

CREATE: Creates a new record set. DELETE: Deletes an existing record set. UPSERT: Creates or updates a record set.

Question 5

What is an A Record in Route 53?

Answer 5

Maps a domain name to an IPv4 address. Example: example.com -> 192.0.2.1

Question 6

What is a CNAME Record in Route 53?

Answer 6

Maps a domain name to another domain name (alias). Example: www.example.com -> example.com

Question 7

What is an MX Record in Route 53?

Answer 7

Specifies the mail servers responsible for receiving email for a domain. Example: example.com -> mail.example.com

Question 8

What is an ALIAS Record in Route 53?

Answer 8

A Route 53-specific type similar to CNAME, used at the root domain level to point to AWS resources. Example: example.com -> ALIAS to d123cf.cloudfront.net

Question 9

What are the key characteristics of Traffic Flow in Route 53?

Answer 9

A visual editor for creating routing configurations. Supports versioning. Costs $50 per policy per month. Routing rules include Weighted, Failover, Geolocation, Latency, Multivalue Answer, and Geoproximity.

Question 10

What is a Simple Routing Policy in Route 53?

Answer 10

The default policy; one record with multiple IP addresses. Route 53 returns all IP addresses to the DNS resolver in random order.

Question 11

What is a Weighted Routing Policy in Route 53?

Answer 11

Distributes traffic across multiple resources based on assigned weights.

Question 12

What is a Failover Routing Policy in Route 53?

Answer 12

Creates an active/passive setup with a primary site and a secondary recovery site. Traffic is routed to the primary endpoint under normal conditions and redirected to the secondary endpoint if the primary is unhealthy.

Question 13

What is a Geolocation Routing Policy in Route 53?

Answer 13

Routes traffic based on the geographic location of the DNS request.

Question 14

What is a Latency Routing Policy in Route 53?

Answer 14

Routes traffic to the resource that provides the lowest latency, directing traffic to the AWS region with the lowest latency for the user.

Question 15

What is a Multivalue Answer Routing Policy in Route 53?

Answer 15

Returns multiple IP addresses to improve redundancy and load distribution. Up to eight values are returned, with health checks performed.

Question 16

What is a Geoproximity Routing Policy in Route 53?

Answer 16

Routes traffic based on the geographic location of both resources and users, with the ability to adjust traffic flow using bias settings. Available only with Traffic Flow.

Question 17

What are Health Checks in Route 53?

Answer 17

Health checks monitor the health of endpoints every 30 seconds (reduced to 10 seconds if needed) and can monitor other health checks. Up to 50 health checks can be created.

Question 18

What is Route 53 Resolver?

Answer 18

A DNS server that resolves DNS queries between your on-premise network and a VPC, supporting bidirectional traffic resolution.

Question 19

What is DNSSEC and how does it relate to Route 53?

Answer 19

Domain Name System Security Extensions (DNSSEC) secures data exchanges in DNS networks. It allows DNS resolvers to validate that responses are authentic and have not been tampered with. KSK signing is used to sign other keys in the DNSSEC process.

Question 20

What is a Zonal Shift in Route 53?

Answer 20

A Zonal Shift moves a load balancer resource from an impaired availability zone (AZ) to a healthy one. Supported only on ALB and NLB with cross-zone load balancing turned off, and not supported when using ALB as a Global Accelerator endpoint.

Question 21

What are Route 53 Profiles?

Answer 21

Route 53 Profiles allow the application and management of DNS-related configurations across many VPCs and different AWS accounts.

Question 22

What resources can be associated with a Route 53 Profile?

Answer 22

Private Hosted Zone, Route 53 Resolver rules, DNS Firewall rule groups.