AWS SAA Exam Questions Complete Solutions New Update (100% Verified Pass)

AWS SAA Exam Questions Complete Solutions New Update (100% Verified Pass) Auto Scaling - Answers -AWS Auto Scaling lets you build scaling plans that automate how groups of different resources respond to changes in demand. - better fault tolerance + better availability - default will terminate AZ with most instances or oldest launch configuration - default value is 300 seconds S3 Cross Region Replication - Answers -- allows you to copy or replicate data in 2 regions - allows for low latency, disaster recovery, compliance - versioning must be enables - only new uploads in original bucket replicated ELB Cross Zone Load Balacing - Answers -- guarantees even distribution across AZs rather than just within a single AZ. - reduces the need to maintain equivalent numbers of instances in each enabled Availability Zone, and improves your application's ability to handle the loss of one or more instances. CORS (Cross-origin resource sharing) - Answers -- mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin to interact in different domain - XML doc with rules with origins TCP vs UDP - Answers -- transmission control protocol: 3 way handshake for acknowledgment - user datagram protocol: continuous communication without acknowledging connection ELB - Answers -- distributes incoming application traffic across multiple targets - Application, Network, Classic LB's - regional service ( new ELB for each region) Application Load Balancer - Answers -- HTTP(s) + Layer 7 OSi - path/host based routing, bi-directional streaming, containerized applications - flexible application and TLS termination Network Load Balancer - Answers -- suited for TCP traffic where performance is required and they balance load on layer 4 (millions request/s with low lat) - extreme performance + static IP ADDRESS Cloudwatch Metrics - Answers -- collects logs, metrics, events (Performance), alarms, dashboards - EC2 ( CPU, network, disk, health hyperviser) - ever 5 min (defaults), can be 1 min with detailed monitor - for CUSTOM metrics, need to install Cloudwatch agent on EC2 instance Metrics not collected by EC2 Cloudwatch - Answers -- memory utilization - disc swap/ disc space utilization - page utilization - log collection Transit Gateway - Answers -- interconnectivity between VPC's & on prem network. - method for consolidating + centrally managing routing between VPC's with hub and spoke network architecture Amazon SQS - Answers -- decouple work across systems (intermediary step) - standard (delivered at least once = more than once) + FIFO (300 transactions per second). - 1 min - 14 days, default retention 4 days. Once retention reached will be automatically deleted - cannot set priority to individual items in queues SQS Polling (long vs short) - Answers -- how you query SQS for messages/work (default short) - Long = only return from queue if message is there - Short = return immediate with either message or empty - determined by ReceiveMessageWaitTimeSeconds - every time you poll the queue = incur charge SNS ( simple notification service) - Answers -- push based message service to create custom messages to subscribers who wish to be informed about certain topic - send alarms or alerts - topics ( fan out message to large # subscribers endpoints for parallel processing) such as queus, lambdas, endpoints Neptune - Answers -- graph db service for highly connected datasets - highly available with read-replicas, continuous backup to S3 DynamoDB Streams - Answers -- flow of info about changes to items in DB table (captures modifications to data items in the table) - integrated with Lambda to create triggers DynamoDB Global Tables - Answers -- multi region replication solution for fast local performance of globally distributed apps. (replicate table across choice of regions). RDS Read Replicas - Answers -- (performance) - Ec2 connects to RDS backend (DNS) = perfect copy of master. Secondary can be queried for same data as master, promote read replicas to be own production if needed - small amount of replication lag (not updated as quickly) - asynchronous replication - highly scalable AWS Global Accelerator - Answers -- directs traffic to optimal endpoint worldwide ( 2 static IP's), improved user pipeline (user to application) - reduce # of hops to get to resources (edge location) - use cases (gaming, IoT, Voice over IP), fast regional failover Aurora Serverless - Answers -Simple, on demand, autoscaling config (instance automatically scaled up or down and starts on or off based on your application usage). - usecase for infrequent, intermittent, unpredictable workloads, and cheaper = only pay for invocation Aurora - Answers -- MySQL/ PostfreSQL RDBMS 1/10 cost - auto failover to replicas - cluster of instances (handler = endpoint) - 2 copies in 3 AZ for 6 total copies - self-healing - replication = 15 copies - reader endpoints = for read operations (queries) DynamoDB Accelerator (DAX) - Answers -- fully managed, in memory cache that can reduce response times from ms to microseconds for request volume - scale on demand to 10-node cluster - improves write performance - will fail over to replicas in another AZ Cold vs Hot Storage - Answers -- Hot storage refers to the storage that keeps frequently accessed data (hot data). - Warm storage refers to the storage that keeps less frequently accessed data (warm data). - Cold storage refers to the storage that keeps rarely accessed data (cold data).