TD Exam 4 - Long review Flashcards
1
Q
What kind of store is instance store
A
Block storage
2
Q
What EC2 storage gives the best performance
A
Instance store
3
Q
Is instance store included in price
A
Yes
4
Q
When are instance store volumes attached
A
At launch
5
Q
Can an instance have more than one instance store
A
Yes
6
Q
Where are instance store voumes
A
On an EC2 host
7
Q
Are instance store volumes persistent
A
No
8
Q
Are instance store volumes resilient
A
No
9
Q
How can you have instance volume that is isolated from instance lifecycle
A
EBS
10
Q
If you need Resilience and your app has built-in replication
A
it depends, but instance store is an option
11
Q
What should you use if you need super-high performance for storage
A
Instance store
12
Q
What storage should be preferred if cost is an issue (for an instance)
A
Instance store
13
Q
What is cheap EBS
A
ST1 or SC1 (disk-based)
14
Q
What os good EBS for throughput, streaming
A
ST1
15
Q
Can you use ST1 or SC1 EBS for boot
A
No
16
Q
What are high-performance EBS up to 16k IOPS
A
GP2/3
17
Q
What is up to 64k IOPS EBS
A
IO1/2
18
Q
How can you get up to 260k IOPS from EBS
A
RAID0 (need optimized EBS and Iinstance)
19
Q
How can you gete more than 260k IOPS
A
Instance store
20
Q
What is Provisione dIOPS SSD
A
EBS, io1/2, consistent low latency and jitter
21
Q
What are ACID and BASE
A
DB transation models
22
Q
What is the focus of ACID
A
Consistency
23
Q
What is the focus of BASE
A
Availability
24
Q
What is RDS, ACID or BASE
A
ACID
25
What is DynamoDB by default, ACID or BASE
BASE
26
Can you have ACID DynamoDB
Yes, with dynamodb transactions
27
What is ACID usually
RelationalW
28
hat is BASE usually
NoSQL
29
What are the steps to have S3 websote hosting
Allow public access
Enable static website hosting
Update bucket policy to allow all principals to get object
30
Where do you enable CORS, on the bucket that has the requester html, or the one that has the requested html
Requested html bucket
31
What do Launch Configurations and Templates do
Define EC2 configuration in advance
32
Are Launch Configurations and Templates editable
No, but you have versions for Launch Templates
33
Are versions available for Launch Configurations
No
34
Can Launch templates be used elsewhere than ASG
Yes, from CLI and UI
35
Can Launch Configurations be used elsewhere than ASG
No
36
Whare are you responsible for renewing certificates in ACM
When you imported them
37
Does ACM automatically renew certificates
If it generated it, yes
38
Can ACM deploy certificates to anything
No, only to supported services (eg not EC2)
39
What kind of service in ACM
Regional service
40
Can ACM certificates leave the region theyr are generated or imported in
No
41
Can you use a certificate from another region for an ALB in another region
No, the certificate must be in the same region as the ALB
Except CloudFront, US-east-1
42
What region are global services (like CloudFront) from the perspective of ACM
US-EAST-1
43
How do ACM certs make it to edge locations
The distribution takes it from us-east-1 and sends it to the edge location
44
How many ENIs do EC2 have by deafult
One, it's primary
45
Can an instance have ENIs in different subnets
Yes, but they have to be in the same AZ
46
Can you have source/destination checks on ENIs
Yes
47
Can you detach and move ENIs
Yes, but only secondary ENIs
48
How many DNS names does an instance have
Can have one for its public IP
One for a public IP
49
What does the public IP DNS name of an instance resolve to
Private IP inside subnet
Public IP outside
50
What happens when you assign an elastic IP
It removes the other public IP
51
How can you do something sneaky with MAC-based licensing
Use secondary ENI MAC address and move it between instances
52
Does an instance lose its public IPv4 address when it stops and start
Yes, unless it has an elastic public IP
53
What does Requester pays do
Requester pays for cost of request and data download
54
What is AWS Application Migration Service
Automated lift and shift solution
55
What are the steps when using AWS Migration service
Install AWS Replication Agent
Replicate source servers to AWS
Perform acceptance tests on servers
Execute cutover instance
56
What is the IP for metadata
169.254.169.254
57
How can apps on instances get an instance's public IP
instance metadata
58
Is instance metadata encrypted or secured
No
59
Do ASGs need Scalng policies
No
60
What is manual scaling
Adjust manually min, max and desired
61
What is simple scaling
Set alarm and do action based on it
62
WHat is step scaling
Scale based on step adjustments
Eg set CPU amounts in steps, say how many CPUs to add
63
What is target tracking
Define ideal value
Then it adjusts
64
Can you scale based on an SQS queue length
Yes
65
What value does scaling adjust
Desired
66
What are ASG Lifecycle hooks
Allow you to defin custom actions on instances during ASG actions
67
What is AWS Health
It provides ongoing visibility into your resource performance and the availability of your aws services and accounts
68
What can you use to detect and react to AWS Health events
EventBridge
69
What does AWS Service health dashboard do
Shows public events that may affect several customers in particular regions
Not events related to specific EC2 instances on individual AWS accounts
70
What does AWS Personal health dashboard do
Visibility into your resource performance and the availability of your AWS services and accounts
71
For an ALB, how many listeners can you have on a given port
Only one
72
Can a listener on ALB support mutliple domains
Yes
73
What is ElastiCachr
In-memory database, high-performance
74
What are the 2 engines for ElastiCache
Redis
Memcached
75
What kind of workload is good for elasticache
Read heavy workloads with low latency requirements
76
What is 2 advantages of Elasticache
Reduces database workload
Can be used to store Session Data so servers are stateless
77
Does ElastiCache require code changes
yes
78
Should you use ElastiCache with DnamoDB
No
79
Which elasticache engine supports advanced data structures
Redis
80
Which elasticache engine supports Multi-AZ replication
Redis
81
Which elasticache engine supports backup and restore
Redis
82
Which elasticache engine is multithreaded
Memcached
83
Which elasticache engine supports transactions
Redis
84
What is AWS COnfig used for
To evaluate the configuration settings of your AWS resources
85
Can AWS Config send events to Amazon EventBridge
Yes
86
What is an OAI (Origin access identity)
An identity, not a role or a user
87
