A solutions architect is configuring network security for a VPC. The architect needs to explicitly deny traffic from a specific malicious IP address from reaching any resources in a public subnet. Which AWS feature should the architect use?

Answer options:

Security Group

Network Access Control List (NACL)

Route Table

AWS WAF

How to approach this question

Remember that Security Groups are stateful and allow-only. NACLs are stateless and support explicit deny rules.

Full Answer

B.Network Access Control List (NACL)✓ Correct

A network access control list (NACL) is an optional layer of security for your VPC that acts as a firewall for controlling traffic in and out of one or more subnets. Unlike security groups, NACLs support explicit deny rules, making them the correct choice for blocking a specific IP address.

Common mistakes

Choosing Security Groups, forgetting that they cannot explicitly deny traffic.

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