免费试练题：AWS Certified Cloud Practitioner CLF-C02 - IAM与AutoScaling详解

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在最新的 AWS Certified Cloud Practitioner CLF-C02 考试准备材料中，有一套实践测试题可供参考。该测试包含多选题，旨在帮助考生熟悉 AWS 服务及其功能，特别是那些免费提供的服务，这对于理解和通过考试至关重要。题目涉及的知识点包括 AWS Identity and Access Management (IAM) 和 AWS Auto Scaling。第一个问题考察的是哪些 AWS 服务是始终免费使用的，正确答案有两个： 1. AWS Identity and Access Management (IAM): IAM 是 AWS 账户的一项安全特性，它允许用户管理和控制对 AWS 服务和资源的访问，确保安全。IAM 不收取额外费用，作为账户基础的一部分提供。 2. AWS Auto Scaling: 这是一项自动调整计算资源规模的服务，以保持应用性能稳定并降低成本。虽然 AWS Auto Scaling 是在 AWS 计费结构中根据实际使用计算资源计费，但在设置和使用基础的自动化扩展时，它是免费提供的。其他选项如 Amazon DynamoDB、Amazon Elastic Compute Cloud (Amazon EC2) 和 Amazon Simple Storage Service (Amazon S3) 的费用则取决于具体使用情况。Amazon DynamoDB 和 Amazon EC2 提供按需或预留实例服务，而 Amazon S3 存储费用根据存储和传输数据量计算。了解这些免费和收费模式对于备考 AWS Certified Cloud Practitioner CLF-C02 的考生来说至关重要，因为它们反映了实际工作中的成本效益分析和资源管理决策。通过深入学习和练习这类题目，考生能够增强对 AWS 服务的理解，并为通过 C02 考试做好充分准备。

问题

13：

正确

Access

Key

and

Secret

Access

Key

are

tied

which

of the

following

AWS

Identity

and

Access

Management

(AWS

IAM)

entities?

IAM

Policy

IAM

Role

IAM

User

Group

IAM

User

（正确）

注解

Correct

option:

IAM

User

Access

keys

are

long-term

credentials

for

IAM

user

the

AWS

account

root

user.

You

can use

access

keys

sign

programmatic

requests

the

AWS

CLI

AWS

API

(directly

using

the

AWS

SDK).

Access

keys

consist

two

parts:

access

key

(for

example,

AKIAIOSFODNN7EXAMPLE)

and

secret

access

key

(for

example,

wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY).

user

name

and

password,

you

must

use

both

the

access

key

and

secret

access

key

together

authenticate

your

requests.

Access

Keys

are

secret,

just

password.

You

should

never share

them.

Incorrect

options:

IAM

Role

IAM

role

similar

IAM

user,

that

it is an

AWS

identity

with

permission

policies

that

determine

what

the identity

can

and

cannot

AWS.

However,

instead

being

uniquely

associated

with

one person,

role

intended

assumable

anyone

who

needs

it.

IAM

User

Group

IAM

User

Group

is a

collection

IAM

users.

Groups

let

you specify

permissions

for

multiple

users,

which

can

make

easier

manage

the

permissions

for

those

users.

IAM

Policy

You

manage

access

AWS

creating

policies

and

attaching

them

IAM

identities

(users,

groups

users,

roles)

AWS

resources.

policy is an

object

AWS

that,

when

associated

with

an identity

resource,

defines

their

permissions.

Access

keys

are

not

tied

the

IAM

role,

IAM

group,

AWS

policy.

all

three

options

are

incorrect.

Reference:

https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html

问题

14：

正确

Which

Amazon

Elastic

Compute

Cloud

(Amazon

EC2)

pricing

model

is the

most

cost-

effective

and

flexible

with

requirement

for

long

term

resource

commitment

upfront

payment

but still

guarantees

that

instance

would

not

interrupted?

Spot Instance

On-demand

Instance

（正确）

Reserved

Instance

(RI)

Dedicated

Host

注解

Correct

option:

On-demand

Instance

On-Demand

Instance

is an

instance

that

you use

on-demand.

You

have

full

control

over

its

lifecycle

—

you

decide

when

launch,

stop,

hibernate,

start,

reboot,

terminate

it.

There

is no

long-term

commitment

required

when

you

purchase

On-Demand

Instances.

There

is no

upfront

payment

and

you pay

only

for

the

seconds

that

your

On-Demand

Instances

are

running.

The

price per

second

for

running

On-

Demand

Instance

fixed.

On-demand

instances

cannot

interrupted.

EC2

Pricing

Options

Overview:

via

https://aws.amazon.com/ec2/pricing/

Incorrect

options:

Reserved

Instance

(RI)

Reserved

Instance

(RI)

provides

you

with significant

savings

your

Amazon

EC2

costs

compared

On-Demand

Instance

pricing.

Reserved

Instances

(RI)

are

not

physical

instances,

but

rather

billing

discount

applied

the

use

On-

Demand

Instances

your

account.

You

can

purchase

Reserved

Instance

(RI) for

one-

year

three-year

commitment,

with

the

three-year

commitment

offering

bigger

discount.

You

will

charged

for

the entire

duration, irrespective

your

usage.

this

option

is not

correct

for

the

given

use-case.

Spot

Instance

Spot Instance

is an

unused

EC2

instance

that

available

for

less

than

the

On-Demand

price.

Because

Spot

Instances

enable

you

request

unused

EC2

instances

steep

discounts,

you can lower

your

Amazon

EC2

costs

significantly.

Spot

Instances

are

well-suited

for

data

analysis,

batch

jobs,

background

processing,

and

optional

tasks.

These

can

terminated

short

notice,

these

are

not

suitable

for

critical

workloads

that

need

run

specific

point

in time.

this

option

is not

correct

for

the

given

use-case.

Dedicated

Host

Amazon

EC2

Dedicated

Host

allows

you

use

your

eligible

software

licenses

from

vendors

such

Microsoft

and Oracle

Amazon

EC2

that

you

get the

flexibility

and

cost-effectiveness

using

your licenses,

but

with

the

resiliency, simplicity,

and

elasticity

AWS.

Amazon

EC2

Dedicated

Host

is a

physical server

fully

dedicated

for

your

use,

you can

help

address

corporate

compliance

requirement.

Dedicated

Host

is not

cost-efficient

compared

On-Demand

instance.

this

option

is not

correct.

Reference:

https://aws.amazon.com/ec2/pricing/

问题

15：

不正确

What

is the

primary

benefit

deploying

Amazon RDS

Multi-AZ

database

with

one

standby?

Amazon

RDS

Multi-AZ

protects

the

database

from

regional

（错误）

failure

Amazon

RDS

Multi-AZ

improves

database

performance

for

read-heavy

workloads

Amazon

RDS

Multi-AZ

reduces

database

usage

costs

Amazon

RDS

Multi-AZ

enhances

database

availability

（正确）

注解

Correct

option:

Amazon

RDS

Multi-AZ

enhances

database

availability

Amazon RDS

Multi-AZ

deployments

provide

enhanced

availability

and

durability

forAmazon

Relational

Database

Service

(Amazon

RDS)

instances,

making

them

natural

fit

for

production

database

workloads.

When

you provision

Amazon RDS

Multi-AZ

Instance

with

one standby,

Amazon RDS

automatically

creates

primary

Instance

and

synchronously

replicates

the

data

standby

instance

in a

different

Availability

Zone

(AZ).

case

of an

infrastructure

failure,

Amazon RDS

performs

automatic

failover

the

standby

that

you can

resume

database

operations

soon

the

failover

complete.

How Amazon RDS

Multi-AZ

Works:

via

https://aws.amazon.com/rds/features/multi-az/

Exam

Alert:

Please

review

the

differences

between

Multi-AZ,

Multi-Region

and

Read

Replica

deployments

for

RDS:

via

https://aws.amazon.com/rds/features/multi-az/

Incorrect

options:

Amazon

RDS

Multi-AZ

improves database

performance

for

read-heavy

workloads

Amazon RDS

Multi-AZ

with

one

standby

does

not

allow

read

operations

from

the

standby.

Read

Replicas

allow

you

create

read-only

copies

that

are

synchronized

with

your

master

database.

Read

Replicas

are

used

for

improved

read

performance.

Therefore,

this

option

incorrect.

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