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    PracticeAWS Solutions Architect Associate (SAA-C03)AWS SAA-C03 Practice Exam 4Question 14
    Medium1 markMultiple Choice
    Domain 1.2: Secure WorkloadsSecurityVPCNACLSecurity Groups

    AWS SAA-C03 · Question 14 · Domain 1.2: Secure Workloads

    A company is deploying a new application on Amazon EC2 instances. The security team requires that all network traffic to and from the instances be strictly controlled. Specifically, they want to block traffic from a known malicious IP address at the subnet level, and only allow HTTP/HTTPS traffic to the instances. <br/><br/>Which TWO actions should the solutions architect take? (Select TWO.)

    Answer options:

    A.

    Create a Network ACL and add a deny rule for the malicious IP address.

    B.

    Configure a Security Group to deny traffic from the malicious IP address.

    C.

    Configure a Security Group to allow inbound HTTP and HTTPS traffic and attach it to the EC2 instances.

    D.

    Create an AWS WAF rule to block the malicious IP address and attach it to the EC2 instances.

    E.

    Modify the VPC Route Table to route traffic from the malicious IP to a blackhole.

    How to approach this question

    Remember that NACLs are stateless and support DENY rules, while Security Groups are stateful and only support ALLOW rules.

    Full Answer

    Network ACLs (NACLs) act as a firewall for associated subnets, controlling both inbound and outbound traffic at the subnet level. They support explicit DENY rules. Security Groups act as a firewall for associated Amazon EC2 instances, controlling both inbound and outbound traffic at the instance level. They only support ALLOW rules.

    Common mistakes

    Trying to use a Security Group to explicitly deny an IP address.
    Question 13All questionsQuestion 15

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