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MyAWS Architect Professional > High Availability and Business Continuity 15% > Flashcards

High Availability and Business Continuity 15% Flashcards

1
Q

DR Scenario that uses S3, Import/Export, Storage GW

A

Back and Restore

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2
Q

DR scenario that has minimal version of infra. EC2, RDS, AMIs, CF, pre-allocated ENIs

A

Pilot Light

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3
Q

DR scenario that reduces recovery time by having some services already ready, horizontal scaling with elbs, manual dns or auto route 53 dns based on health check, and use of autoscaling to accommodate additional load

A

Warm Standby

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4
Q

DR scenario that is active/active between on prem and AWS. Route53 can send traffic to either or both, autoscaling to handle additional load

A

Mutlisite

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5
Q

Minimum time to recovery from Glacier

A

3 hours

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6
Q

Does DynamoDB over Cross-Region replication

A

Yes

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7
Q

This service has the ability to replicate snapshots or run read replicas in other regions

A

RDS

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8
Q

The data storage service allows you to take snapshots to S3 and replicate them to another region

A

Redshift

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9
Q

This database service uses Always on Availability Groups, and Mirroring for HA

A

SQL

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10
Q

DB service that uses async replication to other regions for ha

A

MySQL

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11
Q

DB services that uses DataGuard and RAC for HA

A

Oracle

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12
Q

Situations that can trigger multi-az automatic failover

A

Loss of connectivity to primary db, storage or host failure, patching, or manually with reboot of primary db

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13
Q

These multi-az dbs use amazon’s az failover tech

A

Oracle, PostgreSQL, MySQL, and MariaDB

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14
Q

This DB uses it’s own mirroring for failover within an az

A

SQL

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15
Q

This DB uses copies of the data in a db cluster across multiple AZ’s

A

Aurora

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16
Q

How many Read Replicas can you have per a single instance

A

5

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17
Q

Uses for Read Replicas

A

offloading read traffic, continual reads even during backed up or maintained, business reporting, getting io closer to customers, dr capabilities, data center migrations

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18
Q

MySQL 5.6 uses which engines? Which one is supported by AWS?

A

InnoDB or MYisam. InnoDB is only supported by AWS

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19
Q

Which versions of PostgreSQL is supported

A

9.3.5 or newer

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20
Q

Which versions of MariaDB is supported

A

All current versions

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21
Q

Which versions of MySQL and Oracle are supported

A

All current versions

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22
Q

T/F. When creating RR of your RDS database with out Multi-AZ enable you will not experience any outage.

A

False. Only when you have multi-az enable will you be able to take a RR without interruption. Can go offline for about a minute during snapshotting

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23
Q

Which databases support RR in a different region?

A

MySQL, PostgeSQL, MariaDB (RDS), and also Aurora

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24
Q

Which databases do not support RR’s in a different region?

A

SQL and Oracle

25
T/F. Read replicas can also be mutli-az enabled
False
26
Which DB services allows for RR's of RR's
MySQL. Can increase latency
27
T/F. If creating a replica of an encrypted database the target can be un-encrypted
False. The encryption must match
28
T/F. DB snapshots and backups can be taken from RR's
False. Only can be done on the primary db
29
What DB should you use if the application does not require ACID, joins or SQL support?
DynamoDB
30
Gateway cached volumes size and totals supported
Each volume can be 32TB with 32 volumes supported. Total size of 1PB
31
Gateway stored volumes size and total supported
Each volume can be 16TB with 32 volumes support. Total storage 512TB.
32
Storage amounts supported by Gateway VTL
1500 virtual tapes up to 1PB but can be archived to Glacier for unlimited storage
33
AWS service that can allow you to have unlimited storage and r/w files via NFS
File Gateway
34
Largest file size supported by S3 and File Gateway
5TB
35
Storage Gateway facts
Can be deployed on premise on VMWare or HyperV, or on an EC2 instance. Can be used with Direct Connect. Can be throttled
36
Storage Gateway hardware requirement
4 or 8 CPUs, 16GB RAM, 80 local disk
37
Storage requirements for Gateway Cached data storage
For 200GB volume you should use ~300GB so there is an upload buffer
38
Storage requirements for Gateway Stored data storage
1:1 ratio since the low latency storage is completely stored on premise and also replicated to AWS
39
What ports are used by Storage Gateway?
80 (only for activation), 443, 3260 (iSCSI), UDP 53
40
T/F EBS volumes for instances can be created from Storage Gateway snapshots?
True.
41
Storage gateway snapshot are stored where?
S3
42
How are Storage Gateway snapshots run?
Scheduled or ad-hoc
43
Access times to virtual tapes?
Start instantly
44
Access times to restore from virtual tape shelf
around 24 hours
45
How is the data encrypted for Storage Gateways
Encrypted in transit using SSL and at rest using AES256
46
Snowball capacities
Standard is 80TB and Edge has 100TB
47
T/F Snowball Edge can run Lambda function
True. Edge has onboard compute
48
Snowball can import and export to what service(s)
S3. Glacer can also be used but an export must be done first to write to the Snowball
49
T/F AWS Export can export previous versions of data
False. Only current versions supported
50
When should you consider using Snowball?
When you data transfer can take more than a week to complete
51
T/F Using Direct Connect is a cheaper option to move large amounts in a one-time transfer of data into AWS than Snowball
False
52
T/F Using Snowball you can import directly to EBS.
False. This can be done however using the Import/Export Service
53
Services that have automated backups
RDS, Elasticache (Redis Only), Redshift
54
T/F. When deleting an RDS instance all backups will be deleted including the manually initiated onces
False, only the automatic backups will be deleted. Manually backed up dbs will need to be deleted.
55
How to change the engine type on a database such as SQL Standard to Enterprise
This can be done by dong a restore to a new instance.
56
T/F. Elasticache Backups are available on Redis and Memcached
False. Backups are only available on Redis
57
Elasticache backups performance considerations
Performance degraded during backup and is done on the entire cluster so should only be done after hours
58
Redshift backup schedule and storage
Automated by default with a 1 day retention, stored in S3 and only changed data stored

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