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CLF-C01 Exam - Question 29


Which AWS service or feature acts as a firewall for Amazon EC2 instances?

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Correct Answer: D

A security group acts as a virtual firewall for Amazon EC2 instances, controlling both incoming and outgoing traffic at the instance level. It provides a set of rules that specify what traffic is permitted to reach the EC2 instance and what traffic is allowed to leave from it. Security groups are essential for the security and management of network traffic in AWS environments.

Discussion

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JYKL88Option: D
Nov 15, 2022

Security group - at instance level NACL - subnet level

vichu0308
Sep 19, 2022

NACL are virtual firewall for subnets whereas Security groups are virtual firewall for ec2 instances. So its D

onejasonOption: D
Sep 6, 2022

A security group is a virtual firewall that controls inbound and outbound traffic for an Amazon EC2 instance.

parkuOption: D
Nov 24, 2022

https://www.knowledgehut.com/tutorials/aws/nacl-vs-security-groups

Flex1Option: D
Sep 2, 2022

Option D - Security Group is correct per AWS Doc : https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-security-groups.html

Pranava_GCPOption: D
Aug 9, 2023

D. Security group "A security group acts as a virtual firewall for your EC2 instances to control incoming and outgoing traffic. Inbound rules control the incoming traffic to your instance, and outbound rules control the outgoing traffic from your instance. When you launch an instance, you can specify one or more security groups. " https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-security-groups.html

blopaOption: D
Aug 29, 2023

Security group at EC2 level

PearlR
Mar 8, 2024

Security groups acts as firewall for ec2 instances .. for both inbound and outband traffic

Dipa_2910Option: D
Feb 1, 2025

Security Group as it is the firewall for Aamzon instances whereas AMAZON NACL works at the VPC Level and AWS WAF (Web Application firewall ) works at the application level

radsreed
Sep 2, 2022

I think Network ACL, It acts as Virtual firewall that controls in bound and outbound traffic at subnet level.

Flex1
Sep 2, 2022

The question is asking for the service that acts as firewall for Amazon EC2 instances, not at the Subnet level. It's clearly Security group.

Julio_POption: D
Sep 7, 2022

D is correct in that case

sumanshu
Sep 13, 2022

Vote for D

KanteneOption: D
Oct 26, 2022

Vote for D A security group is a virtual firewall that controls inbound and outbound traffic for an Amazon EC2 instance.

amd112bOption: D
Nov 2, 2022

Security Group

Saif93Option: D
Jan 18, 2023

D is the answer.

Abzstar
Feb 18, 2023

correct answer is D

elidiojoseOption: D
Mar 9, 2023

D. Security Group.

subhaMish
May 19, 2023

D - Security group

GorioDeCavite
Jun 5, 2023

i think its D

Warsame21
Jun 15, 2023

D. Security group.

ESAJRROption: D
Jun 16, 2023

D. Security group.

STOPITALREADYOption: D
Jul 4, 2023

D. Security group.

man5484Option: D
Jul 9, 2023

A security group acts as a virtual firewall for an Amazon EC2 instance. It controls inbound and outbound traffic at the instance level and provides a set of rules (security group rules) that determine what traffic is allowed to reach the EC2 instance and what traffic is allowed to leave from it.

osho_garg
Jul 20, 2023

D. Security Group

techandraOption: D
Nov 10, 2023

Security group

RangilaThakurOption: D
Jan 7, 2024

SG for EC2

sonaljainOption: D
Dec 26, 2024

Security group

HebaXXOption: D
Mar 22, 2025

Security Groups are virtual firewalls