Route 53

Question 1

What is the name for AWS’s DNS server?

Answer 1

Route 53?

Question 2

Why is it called route 53?

Answer 2

It is on port 53

Question 3

What does Route 53 do?

Answer 3

It sends users to different IP addresses based on human friendly domain names

Question 4

What is a top level domain?

Answer 4

last word in domain name. Example, .com, .edu, etc

Question 5

What is a second level domain name?

Answer 5

second word in domain name. Example, .co.uk (uk is second level domain name)

Question 6

Who is the Internet Assigned Numbers Authority? (IANA)

Answer 6

They host a DB of all available top level domains

Question 7

What is a domain registrar?

Answer 7

Authority that can assign domain names directly under one or more top level domains. Example, GoDaddy, Amazon

Question 8

What is contained in a Start of Authority Record (SOA)

Answer 8

Name of server that supplied data for zone, admin for zone, default number of seconds for TTL

Question 9

Name Server (NS) Records

Answer 9

used by top level domain servers to direct traffic to content DNS server which contains authoritative DNS records

Question 10

A Record

Answer 10

fundamental type of DNS record. These translate name of domain into an IP address. (A stands for address)

Question 11

TTL (Time to Live)

Answer 11

length that a DNS record is cached on either resolving server or users own local PC

Question 12

CName

Answer 12

used to resolve one domain name to another. Stands for Canonical name

Question 13

True or False: CNAMEs must be for A record or alias

Answer 13

True

Question 14

Alias Record

Answer 14

map resource record sets in your hosted zone to ELBs, Cloudfront distributions or S3 buckets that are configured as websites

Question 15

Simple Routing Policy

Answer 15

Only one record but can have multiple IP addresses. Route 53 will return IP addresses in random order if you specify multiple values. No health checks

Question 16

Weighted Routing Policy

Answer 16

Split traffic based on different weights assigned. Ex 10% of traffic to US East 1 and 90% of traffic to US West 1

Question 17

Latency Routing Policy

Answer 17

Route traffic based on lowest network latency for your end user.

Question 18

Failover Routing Policy

Answer 18

Used is you want a primary site and a DR site if the primary site fails a health check

Question 19

Geolocation Routing Policy

Answer 19

Route traffic based on geographic location of your users (location from which DNS queries originate). Good if you want to update the language or currency on a site based on the country the user is in

Question 20

Geoproximity Routing (Traffic Flow Only)

Answer 20

Route traffic to resource based on geographic location of your users and your resources and you can optionally choose to route more or less to a given resource by specifying a bias. Traffic policies allow you to put in a latitude and longitude and assign it a bias

Question 21

Multivalue Answer Policy

Answer 21

Same as simple routing policy except you can assign health checks

Question 22

How do you resolve to a ELB?

Answer 22

Using a DNS name. Specifically, you should create a CNAME record

Question 23

Is there a limit to the number of domain names in an AWS account and if so what is it?

Answer 23

Default limit is 50 domain names but this can be increased by AWS support