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AWS Solutions 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
Q

T/F. Read replicas can also be mutli-az enabled

26
Q

Which DB services allows for RR’s of RR’s

A

MySQL. Can increase latency

27
Q

T/F. If creating a replica of an encrypted database the target can be un-encrypted

A

False. The encryption must match

28
Q

T/F. DB snapshots and backups can be taken from RR’s

A

False. Only can be done on the primary db

29
Q

What DB should you use if the application does not require ACID, joins or SQL support?

30
Q

Gateway cached volumes size and totals supported

A

Each volume can be 32TB with 32 volumes supported. Total size of 1PB

31
Q

Gateway stored volumes size and total supported

A

Each volume can be 16TB with 32 volumes support. Total storage 512TB.

32
Q

Storage amounts supported by Gateway VTL

A

1500 virtual tapes up to 1PB but can be archived to Glacier for unlimited storage

33
Q

AWS service that can allow you to have unlimited storage and r/w files via NFS

A

File Gateway

34
Q

Largest file size supported by S3 and File Gateway

35
Q

Storage Gateway facts

A

Can be deployed on premise on VMWare or HyperV, or on an EC2 instance. Can be used with Direct Connect. Can be throttled

36
Q

Storage Gateway hardware requirement

A

4 or 8 CPUs, 16GB RAM, 80 local disk

37
Q

Storage requirements for Gateway Cached data storage

A

For 200GB volume you should use ~300GB so there is an upload buffer

38
Q

Storage requirements for Gateway Stored data storage

A

1:1 ratio since the low latency storage is completely stored on premise and also replicated to AWS

39
Q

What ports are used by Storage Gateway?

A

80 (only for activation), 443, 3260 (iSCSI), UDP 53

40
Q

T/F EBS volumes for instances can be created from Storage Gateway snapshots?

41
Q

Storage gateway snapshot are stored where?

42
Q

How are Storage Gateway snapshots run?

A

Scheduled or ad-hoc

43
Q

Access times to virtual tapes?

A

Start instantly

44
Q

Access times to restore from virtual tape shelf

A

around 24 hours

45
Q

How is the data encrypted for Storage Gateways

A

Encrypted in transit using SSL and at rest using AES256

46
Q

Snowball capacities

A

Standard is 80TB and Edge has 100TB

47
Q

T/F Snowball Edge can run Lambda function

A

True. Edge has onboard compute

48
Q

Snowball can import and export to what service(s)

A

S3. Glacer can also be used but an export must be done first to write to the Snowball

49
Q

T/F AWS Export can export previous versions of data

A

False. Only current versions supported

50
Q

When should you consider using Snowball?

A

When you data transfer can take more than a week to complete

51
Q

T/F Using Direct Connect is a cheaper option to move large amounts in a one-time transfer of data into AWS than Snowball

52
Q

T/F Using Snowball you can import directly to EBS.

A

False. This can be done however using the Import/Export Service

53
Q

Services that have automated backups

A

RDS, Elasticache (Redis Only), Redshift

54
Q

T/F. When deleting an RDS instance all backups will be deleted including the manually initiated onces

A

False, only the automatic backups will be deleted. Manually backed up dbs will need to be deleted.

55
Q

How to change the engine type on a database such as SQL Standard to Enterprise

A

This can be done by dong a restore to a new instance.

56
Q

T/F. Elasticache Backups are available on Redis and Memcached

A

False. Backups are only available on Redis

57
Q

Elasticache backups performance considerations

A

Performance degraded during backup and is done on the entire cluster so should only be done after hours

58
Q

Redshift backup schedule and storage

A

Automated by default with a 1 day retention, stored in S3 and only changed data stored

AWS Solutions Architect Professional (5 decks)

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