AWS - Sysops - ACG - High Availability (with Complete Solutions)

Cache Hit Ratios correct answers The more requests that CloudFront is able to serve from edge locations, the better it works. The ratio of requests served from edge locations (rather than the origin) is known as the cache hit ratio. The more requests from edge locations, the better the performance. CloudFront Key Terminology Web Distribution - RTMP - correct answers Web Distribution - Typically used for Websites. RTMP - Used for Media Streaming. What is Elasticity? correct answers Elasticity allows you to stretch out and retract back your infrastructure, based on your demand. Under this model you only pay for what you need. Elasticity is used during a short time period, such as hours or days. What is Scalabililty? correct answers Scalability is used to talk about building out the infrastructure to meet your demands long term. Scalability is used over longer time eriods, such as weeks, days, months and years. RDS Multi-AZ correct answers Multi AZ keeps a copy of your production database in a separate Availability Zone in case of a failure or disaster. AWS manage the failure from one AZ to another automatically. RDS Multi-AZ can be used for correct answers Disaster Recovery Only Multi-AZ deployments for the ____________utilize synchronous physical replication to keep data on the standby up-to- date with the primary. correct answers MySQL, Oracle, and PostgreSQL engines Multi-AZ deployments for the __________use synchronous logical replication to achieve the same result, employing SQL Server-native Mirroring technology. correct answers SQL Server engine Multi-AZ Failover Advantages correct answers High availability Backups are taken from secondary which avoids I/O suspension to the primary Restore's are taken from secondary which avoids I/O suspension to the primary You can force a failover from one AZ to another by ..... correct answers rebooting your instance. This can be done through the AWS Management console or by using RebootDBInstance API call RDS Multi-AZ Failover is or is not a scaling solution? correct answers Is not