Route 53

Question 1

How we got Route 53 name?

Answer 1

DNS port is 53; Due to which we got the name Route 53

Question 2

What is Route 53?

Answer 2

Route 53 is DNS service for AWS.

Question 3

What is DNS?

Answer 3

DNS is used to convert human readable domain names into IP addresses.

Question 4

What is IPv4?

Answer 4

32 bit network address

Question 5

What is IPv6?

Answer 5

128 bit network address

Question 6

What is top level domain?

Answer 6

Last word in domain name is top level domain.

Question 7

What is second level domain?

Answer 7

second word from last in domain name is second level domain.

Question 8

What is top level domain for “.com”?

Answer 8

.COM is top level domain

Question 9

What is top & second level domain for “.co.uk”?

Answer 9

.UK is top level domain

.CO is second level domain

Question 10

Top level domain names are controlled by which authority?

Answer 10

IANA - Internet Assigned Number Authority

Question 11

What enforces uniqueness of domain names?

Answer 11

ICANN

Question 12

In which database all DNS must be register?

Answer 12

WhoIS database

Question 13

Popular domain register?

Answer 13

Amazon, go-daddy etc.

Question 14

What is SOA?

Answer 14

Start of Authority record.

Question 15

What SOA stores?

Answer 15

Every DNS hold SOA records which stores data regarding:
Name of server that supply data
admin for zone
current version file
TTL value

Question 16

What is NS record?

Answer 16

Name Server Record is used by top level domain servers to direct traffic to the content DNS server which holds SOA record.

Question 17

How DNS is resolved?

Answer 17

(Web browser) acloudguru.com -> (Top level domain ).com -> ( domain register ) NS record -> SOA -> IP

Question 18

What is A Record?

Answer 18

Its contain IP details for DNS.

Question 19

What is TTL?

Answer 19

The time length that DNS is cached on server or at client machine.

Question 20

What is CNAME?

Answer 20

Canonical Name is used to resolve one domain name to another. Google.com to m.google.com

Question 21

What is Alias records?

Answer 21

“Map resources to Elastic Load balancer, CloudFront or S3.

alias record is similar to CNAME. One DNS to another DNS.

Question 22

Do we get IPv4 for elastic load balancer?

Answer 22

No

Question 23

DNS Types?

Answer 23

SOA Record, 
NS Record,
A Record,
CNAMES,
MX Records,
PTR Records.

Question 24

DNS registration time?

Answer 24

Max 3 days

Question 25

What is Simple Routing?

Answer 25

In simple routing we can map multiple IP address to a domain. & Simple routing will redirect us to any of the IP address in random.

Question 26

What is Weighted Routing?

Answer 26

In Weighted routing we can map multiple IP address to a domain. & Weighted routing will split the traffic based on the different weights assigned to each IP address.

Question 27

What is Latency Based Routing?

Answer 27

In Latency Based routing we can map multiple IP address to a domain. & Latency routing will redirect us to lowest latency IP address.

Question 28

What is Failover Routing?

Answer 28

In Failover routing we can map multiple IP address to a domain as primary & secondary. & failover routing will redirect to primary or secondary IP address based on Web server health/availability.

Question 29

What is Geolocation Routing?

Answer 29

In Geolocation routing we can map multiple IP address to a domain. & Geolocation routing will redirect us to nearest IP address.

Question 30

What is Geoproximity Routing?

Answer 30

In Geoproximity routing we can map multiple IP address to a domain. & Geoproximity routing will redirect us to any of the IP address based on routing flow.

Question 31

What is Multivalued Routing?

Answer 31

In Multivalued routing we can map multiple IP address to a domain. & Multivaluerouting will redirect us to any of the IP address in random with health check associated.

Question 32

Do we have health check involved in Simple routing?

Answer 32

No

Question 33

Which routing is suitable for DR scenario?

Answer 33

Failover routing

Question 34

Which routing is suitable for Country based scenario?

Answer 34

Geolocation Routing

Question 35

when we stop server & start do we get different IP for server?

Answer 35

Yes

Question 36

How to prevent IP address change for web server?

Answer 36

Dedicated IP or using elastic load balancer

Question 37

You have an enterprise solution where CTO asked you to redirect all of Asia traffic to India; which routing will help with this scenario?

Answer 37

Geolocation Routing & geoproximity routing.

Question 38

If UK users are seeing different sites than that of US customers what routing might be in use?

Answer 38

Geolocation Routing & geoproximity routing.

Question 39

You created subdomain for popular websites, you need subdomain point to ELB using route 53; which DNS record set can be used?

Answer 39

CNAME & Alias

Question 40

Your company has 8 web servers & network traffic should be served based on resilience which routing can be used?

Answer 40

Multivalued routing

Question 41

Is there is limit for no of domain names that you can manage in AWS?

Answer 41

Yes limit is 20 but it can be extended by AWS.

Question 42

Which routing will redirect to different server if health check is not good?

Answer 42

Failover routing & latency based routing