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AWS SSA > Study > Flashcards

Study Flashcards

1
Q

Characteristics of Public IP

A
  • Public IP means the machine can be identified on the internet (WWW)
  • Must be unique across the whole web (not two machines can have the same public IP).
  • Can be geo-located easily
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2
Q

Characteristics of Private IP

A
  • Private IP means the machine can only be identified on a private network only
  • The IP must be unique across the private network
  • BUT two different private networks (two companies) can have the same IPs.
  • Machines connect to WWW using a NAT + internet gateway (a proxy)
  • Only a specified range of IPs can be used as private IP
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3
Q

What are the 3 placement groups?

A

cluster, spread, partition

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4
Q

Cluster

A

Same rack/Same az

Benefits: great network (10gpbs), low latency

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5
Q

Spread

A

Span across different AZ. But limited to 7 instances per AZ, per placement group

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6
Q

Partition

A

spreads instances across many different partitions (which rely on different sets of racks) within an AZ. Scales to 100s of EC2 instances per group (Hadoop, Cassandra, Kafka)

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7
Q

elastic network interface (ENI)

A

Logical component in a VPC that represents a
virtual network card
*bound to specific az

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8
Q

EC2 Hibernate

A

The in-memory (RAM) state is preserved.

the RAM state is written to a file in the root EBS volume. The root EBS volume must be encrypted

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9
Q

EC2 Nitro

A

Underlying Platform for the next generation of EC2 instances
Benefits: Allows for better performance:
• Better networking options (enhanced networking, HPC, IPv6)
• Higher Speed EBS (Nitro is necessary for 64,000 EBS IOPS – max 32,000 on non-Nitro)

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10
Q

spot block instances

A

By using Spot Block Instances, you reserve a set of Spot EC2 instances for a specified duration (1-6 hours) without interruption.

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11
Q

Spot Fleet is a set of Spot Instances and optionally

A

On-demand Instances. It allows you to automatically request Spot Instances with the lowest price.

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12
Q

what’s an EBS Volume?

A

-An EBS (Elastic Block Store) Volume is a network drive you can attach to your instances while they run
• It allows your instances to persist data, even after their termination
• They can only be mounted to one instance at a time (at the CCP level)
• They are bound to a specific availability zone

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13
Q

AMI are built for specify regions? true or false

A

true

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14
Q

EC2 Instance Store

A

A high-performance hardware disk.

EC2 Instance Store lose their storage if they’re stopped

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15
Q

EBS Volumes gp2 / gp3 (SSD)

A

General purpose SSD volume that is cost effective and low-latency for a wide variety of workloads

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16
Q

EBS Volumes Provisioned IOPS (PIOPS) SSD

A

Critical business applications with sustained IOPS performance
Or applications that need more than 16,000 IOPS
Great for databases workloads (sensitive to storage perf and consistency)

17
Q

EBS Volumes Hard Disk Drives (HDD)

A

125 MiB to 16TiB
• Throughput Optimized HDD (st1)
• Big Data, Data Warehouses, Log Processing • Max throughput 500 MiB/s – max IOPS 500
• Cold HDD (sc1):
• For data that is infrequently accessed
• Scenarios where lowest cost is important
• Max throughput 250 MiB/s – max IOPS 250

18
Q

how to encrypt an unencrypted EBS volume?

A
  • Create an EBS snapshot of the volume
  • Encrypt the EBS snapshot ( using copy )
  • Create new ebs volume from the snapshot ( the volume will also be encrypted )
  • Now you can attach the encrypted volume to the original instance
19
Q

EFS – Elastic File System

A
  • Managed NFS (network file system) that can be mounted on many EC2
  • EFS works with EC2 instances in multi-AZ
  • Highly available, scalable, expensive (3x gp2), pay per use
20
Q

EFS Performance mode

A
  • General purpose (default): latency-sensitive use cases (web server, CMS, etc…)
  • Max I/O – higher latency, throughput, highly parallel (big data, media processing)
21
Q

EFS Throughput mode

A
  • Bursting (1TB = 50MiB/s + burst of up to 100MiB/s)

* Provisioned: set your throughput regardless of storage size, ex: 1 GiB/s for 1 TB storage

22
Q

EFS Storage Tiers (lifecycle management feature – move file after N days)

A
  • Standard: for frequently accessed files

* Infrequent access (EFS-IA): cost to retrieve files, lower price to store

AWS SSA (1 decks)

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