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Network Security, Compliance and Governance →mediumMultiple ChoiceObjective-mapped

ANS-C01 Network Security, Compliance and Governance Practice Question

Network Topology
$ aws ec2 describe-network-aclsregion us-east-1Refer to the exhibit.```"NetworkAcls": ["Associations": ["NetworkAclId": "acl-12345","SubnetId": "subnet-abc"],"Entries": ["CidrBlock": "0.0.0.0/0","Egress": false,"Protocol": "6","RuleAction": "allow","RuleNumber": 100},"Protocol": "-1","RuleAction": "deny","RuleNumber": 32767"Egress": true,"NetworkAclId": "acl-12345"

Refer to the exhibit. A network engineer examines the network ACL for a subnet. Which statement best describes the effect of this network ACL?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Inbound TCP traffic is allowed, but all outbound traffic is denied

The inbound rule explicitly allows TCP traffic (protocol 6) from any source (0.0.0.0/0). However, the outbound rules consist only of a default deny rule, which blocks all outbound traffic. Therefore, inbound TCP traffic is allowed, but all outbound traffic is denied. Option A is incorrect because outbound traffic is denied, not allowed. Option C is incorrect because only inbound TCP is allowed, not all inbound traffic. Option D is incorrect because outbound traffic is denied.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Both inbound and outbound TCP traffic are allowed

    Why it's wrong here

    Outbound TCP is denied.

  • ✓

    Inbound TCP traffic is allowed, but all outbound traffic is denied

    Why this is correct

    Inbound TCP rule allows TCP; outbound default deny blocks all.

  • ✗

    All inbound traffic is allowed

    Why it's wrong here

    Only TCP inbound is allowed; other protocols are denied.

  • ✗

    All outbound traffic is allowed

    Why it's wrong here

    Outbound is denied by default rule.

Visual reference

Source Router + ACL permit 10.0.0.0/8 deny any Server 10.0.0.5 ✓ 192.168.1.1 ✗ dropped ACLs evaluate top-down; first match wins — implicit deny all at end

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.