Chp 6: EC2 Solutions Architect Associate Level Flashcards
1
Q
What is an elastic IP?
A
IP changes every time you stop and start instance
2
Q
What is a placement group?
A
controls where EC2s are placed
3
Q
EC2 Placement strategy
A
- cluster
- spread
- partition
4
Q
Pros of EC2 placement group cluster
A
low latency with great network
5
Q
Con of EC2 placement group cluster
A
if the rack fails, then all instances will fail at the same time
6
Q
Pro of spread placement group
A
- span across AZ (same)
- reduced risk in simultaneous failures
- instance on diff physical hardware
7
Q
Cons of EC2 spread placement group
A
7 instance per AZ per placement group
8
Q
Pro of partition placement group
A
- can span multiple AZ in the same region
- instances do not share the same rack
9
Q
what is an elastic network interface (ENI)
A
- a component in a VPC that represents a virtual network card
- bound to a specific az
10
Q
what happens with ec2 hibernate
A
- ec2 in memory ram is preserved
- cannot hibernate for more than 60 days
11
Q
purpose of ec2 capacity reservations
A
- ensure you can have ec2 capacity when you need it
- 1 or 3 year reservations
