AWS Fundamentals 2

Question 1

What is route 53?

Answer 1

Route53 is a managed DNS

Question 2

AWS common records are?

Answer 2

A url to ipv4 - AAAA url to ipv6 - CNAME url to url - Alias URL to aws resource

Question 3

How is client side load balancing done?

Answer 3

ROUTE 53 through DNS

Question 4

what are the routing policies?

Answer 4

simple-failover-geolocation-geoproximity-latency-wighted

Question 5

What do we prefer for aws resources?

Answer 5

we prefer Alias over CNAME for AWS resources - performance reaseons

Question 6

What is RDS?

Answer 6

Relational Database service

Question 7

Is RDS managed?YN

Answer 7

Yes

Question 8

How do we improce RDS reads?

Answer 8

via setting read replicas

Question 9

What is RDS drawback?

Answer 9

you cannot ssh into db instances

Question 10

How many read replicas can you create?

Answer 10

5

Question 11

Where can RDS read replicas be created?

Answer 11

Within AZs - Cross AZs - Cross Regions

Question 12

Is RDS replication ASYNC?YN

Answer 12

Yes

Question 13

How application leverages read replicas?

Answer 13

By using DB connection strings

Question 14

What kind of consistency does RDS has for Replication to MASTER?

Answer 14

Eventual Consistency

Question 15

Where is SYNC replication performed?

Answer 15

STAND-BY instances

Question 16

Are backups NOT automatic RDS?YN

Answer 16

No - They are automatic

Question 17

RDS Max backup retention is?

Answer 17

35 DAYS

Question 18

RDS defult retention is?

Answer 18

7 DAYS

Question 19

How can we get unlimited retention?

Answer 19

BY manual SNAPSHOTS

Question 20

How to enforce SSL for RDS?

Answer 20

POSTGRESS = rds.force_ssl=1 - MSSQL = GRANT USAGE ON *.* to MYSQL@% REQUIRE SSL;

Question 21

Are RDS DBS deployed to subnets?YN

Answer 21

YES - They are mostly private

Question 22

What does RDS use to manage security?

Answer 22

Security Groups

Question 23

Can mysql & aurora NOT use IAM?YN

Answer 23

NO - Now they can

Question 24

Size growth range of aurora is?

Answer 24

10GB to 64TB

Question 25

Max size of aurora replicas?

Answer 25

15

Question 26

Max size of Mysql replicas?

Answer 26

5

Question 27

ElastiCache is?

Answer 27

In memory database

Question 28

What lies underneath elasticache?

Answer 28

REDIS or MEMcached

Question 29

REDIS cannot survive reboots?

Answer 29

FALSE - it can survive

Question 30

What are cache strategies?

Answer 30

LAZY Loading - WRITE Through

Question 31

VPC is Within?

Answer 31

REGION

Question 32

Public subnets are used for?

Answer 32

LBS - FILES - PUBLIC AUTH LAYER

Question 33

PRIVATE subnets are used for?

Answer 33

WEB APP Servers - Databases

Question 34

What do VPC logs do?

Answer 34

MONITOR Logs IN/OUT VPC

Question 35

VPCs are?

Answer 35

Account per region - 5 Regions = 5 VPCs = 5 ACCOUNTS

Question 36

VPC cannot be peered to be on the same network?YN

Answer 36

FALSE - THEY can be peered to be on the same network

Question 37

Route 53 is regional service?YN

Answer 37

FALSE - its GLOBAL