AWS Part 1 Flashcards
What is the latancy based routing (LBR) offered by Route 53?
You can now have instances in several AWS regions and have requests from your end-users automatically routed to the region with the lowest latency.
What is the bit length of an IPv6 address?
128
What are A, AAAA, MX, CNAME, TXT DNS records used for?
A - Stores IPv4 address
AAAA - Stores IPv6 address
MX - Mail exchange (mail server address)
CNAME stores an alias to another domain name (never an IP!, always a domain name. Example ftp.example.com -> example.com. It allows subservices to be mapped to the main IP address)
TXT - arbitrary string
What is a DNS label?
The string parts of a dns name between the dots.
example.com has 2 labels: example and com
What are some of the main features of Route 53?
- DNS failover (can route requests to different servers based on health checks)
- GEO DNS (route users to different servers based on their continent, country, state)
- Private DNS for VPC
- ELB integration
- Weighted Round Robin (specify weights to target servers)
- Create back up sites that receive traffic only when the primary site is not available.
- Route queries to CloudFront distributions
How does route 53 failover DNS health check work?
Lets you specify an IP address, domain and port and url path. It sends HTTP requests to check its health.
Target servers may be AWS hosted servers as well as your own servers outside of AWS.
What is zone apex?
It is the domain name without “www” or other prefixes.
What are the service categories provided by AWS?
Compute
Storage and Content delivery
Database
Networking
Administration and Security
Deployment and Management
Analytics
Application Services
Mobile Services
What “compute” services are provided by AWS?
EC2
Auto Scaling
Elastic Load Balancing
What “storage and content” delivery services are provided by AWS?
S3
AWS Storage Gateway
Amazon Glacier
Amazon CloudFront
Amazon EBS
AWS Export/Import
What “database” services are provided by AWS?
Amazon RDS
Amazon DynamoDB
Amazon ElastiCache
Amazon RedShift
Amazon SimpleDB
What “networking” services are provided by AWS?
Amazon VPC
Amazon Route 53
AWS Direct Connect
What does autoscaling service provide?
Auto Scaling is designed to launch or terminate EC2 instances automatically based on user-defined policies, schedules, and health checks
What events may trigger scaling out?
- manually choose to increase number of instances
- CloudWatch events
- Schedule-based policy
Which cache implementations does ElastiCache support?
Memcached and Redis.
