Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AWS SAA > EC2 > Flashcards

EC2 Flashcards

1
Q

What is a role?

A

An entity designed to be assumed. It provides temporary access using temp credentials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What do roles enable in an account?

A

They enable cross account access

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Are roles regional?

A

No they are global

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why would you want to use roles in EC2?

A

Avoids hard coding credentials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Can you attach/detach roles on a running EC2 instance?

A

Yes you can

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are Security Groups?

A

Virtual Firewalls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

By default what settings does a Security Group have?

A

Everything inbound by default is blocked. All outbound traffic is allowed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are bootstrap scripts?

A

Scripts that run on instance first startup

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What permissions do bootstrap scripts have?

A

Has root access

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why use bootstrap scripts?

A

Enables automation of installing applications in EC2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How many instances can be in a Security Group?

A

Unlimited

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How many Security Groups can an instance attach?

A

5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is EC2 metadata?

A

Data about ec2 instance such as ip addresses, hostname, SG’s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the url for EC2 metadata?

A

169.254.169.254/latest/meta-data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is EC2 user-data?

A

The bootstrap scripts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Can you access metadata via userdata?

A

Yes

17
Q

What are the 3 types of network adapters for ec2?

A
  1. ENI - elastic network interface
  2. EN - enhanced networking
  3. EFA - elastic fabric adapter
18
Q

What are use cases for ENI?

A

everyday networking, dual homed instances, interact with VPC or different networks

19
Q

What are use cases for EN?

A

High performance I/O, high bandwidth, lower latency, single root virtualization. 10-100Gbps

20
Q

What are the 2 types of EN? Which should you always choose?

A
  1. ENA - elastic network adapter
  2. VFI - virtual function
    always choose ENA
21
Q

What are use cases for EFA?

A

HPC, machine learning, OS bypass

22
Q

What are the 3 types of placement groups?

A
  1. Clustered
  2. Partitioned
  3. Spread
23
Q

What is Clustered Placement group?

A

Instances are grouped together into the same AZ

24
Q

Why use Clustered placement group?

A

Low latency, network throughput, HPC

25
Q

What is Partitioned Placement group?

A

Multiple Instances are partitioned where partitions are on different racks/hardware

26
Q

What is Spread Placement group?

A

Individual Instances are placed on their own distinct hardware

27
Q

Why use a Spread Placement group?

A

Keep small # critical instances separate from another

28
Q

Why use a Partitioned Placement group?

A

Isolate impact of power/network failures. For distributed systems like HDFS, Cassandra

29
Q

What Placement group can span multiple Az’s and what can’t?

A

Clustered cannot span multiple AZ’s

Partitioned and Spread can span

30
Q

Can you merge placement groups?

A

No you can’t merge

31
Q

Can you remove/add existing instances into a placement group? The instance has to be in what state?

A

Yes, but the instance must be stopped

32
Q

When should you use EC2 dedicated hosting?

A

When you need dedicated physical hardware due to compliance or licensing

33
Q

When should you not use spot instances?

A
  1. Critical workloads
  2. Databases
  3. Persistent workloads
34
Q

What are some use cases for spot instances?

A
  1. CI/CD
  2. containerized workloads
  3. high performance computing
  4. Big data analytics
35
Q

How much can you save with spot instances?

A

up to 90% savings

36
Q

How do spot instances work?

A

You set a max spot price, and spot instances will be provisioned if it is below this price

37
Q

What is a Spot Block?

A

Stops spot instances from being terminated if the price goes above your max spot price. Can be set for 1-6 hours.

38
Q

What is a spot request? What are the 2 types?

A

Defines the spot price max, # instances you want, launch template, valid time range, request type.

  1. Onetime spot request
  2. Persistent Spot request (keeps provisioning instances until request is met if open/price)
39
Q

What do you need to do to terminate instances in a persistent spot request?

A

You need to cancel the spot request first to prevent it from reprovisioning instances, then terminate instances

AWS SAA (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions