AWS Fundamentals 2 Flashcards
What is route 53?
Route53 is a managed DNS
AWS common records are?
A url to ipv4 - AAAA url to ipv6 - CNAME url to url - Alias URL to aws resource
How is client side load balancing done?
ROUTE 53 through DNS
what are the routing policies?
simple-failover-geolocation-geoproximity-latency-wighted
What do we prefer for aws resources?
we prefer Alias over CNAME for AWS resources - performance reaseons
What is RDS?
Relational Database service
Is RDS managed?YN
Yes
How do we improce RDS reads?
via setting read replicas
What is RDS drawback?
you cannot ssh into db instances
How many read replicas can you create?
5
Where can RDS read replicas be created?
Within AZs - Cross AZs - Cross Regions
Is RDS replication ASYNC?YN
Yes
How application leverages read replicas?
By using DB connection strings
What kind of consistency does RDS has for Replication to MASTER?
Eventual Consistency
Where is SYNC replication performed?
STAND-BY instances
Are backups NOT automatic RDS?YN
No - They are automatic
RDS Max backup retention is?
35 DAYS
RDS defult retention is?
7 DAYS
How can we get unlimited retention?
BY manual SNAPSHOTS
How to enforce SSL for RDS?
POSTGRESS = rds.force_ssl=1 - MSSQL = GRANT USAGE ON *.* to MYSQL@% REQUIRE SSL;
Are RDS DBS deployed to subnets?YN
YES - They are mostly private
What does RDS use to manage security?
Security Groups
Can mysql & aurora NOT use IAM?YN
NO - Now they can
Size growth range of aurora is?
10GB to 64TB
Max size of aurora replicas?
15
Max size of Mysql replicas?
5
ElastiCache is?
In memory database
What lies underneath elasticache?
REDIS or MEMcached
REDIS cannot survive reboots?
FALSE - it can survive
What are cache strategies?
LAZY Loading - WRITE Through
VPC is Within?
REGION
Public subnets are used for?
LBS - FILES - PUBLIC AUTH LAYER
PRIVATE subnets are used for?
WEB APP Servers - Databases
What do VPC logs do?
MONITOR Logs IN/OUT VPC
VPCs are?
Account per region - 5 Regions = 5 VPCs = 5 ACCOUNTS
VPC cannot be peered to be on the same network?YN
FALSE - THEY can be peered to be on the same network
Route 53 is regional service?YN
FALSE - its GLOBAL
