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ANS-C01 Network Security, Compliance and Governance Practice Question

Network Topology
$ aws ec2 describe-network-aclsnetwork-acl-id acl-12345678query 'NetworkAcls[0].Entries'Refer to the exhibit."RuleNumber": 100,"Protocol": "6","RuleAction": "allow","Egress": false,"CidrBlock": "10.0.0.0/16","PortRange": {"From": 22,"To": 22},"RuleNumber": 200,"CidrBlock": "0.0.0.0/0","From": 443,"To": 443"RuleNumber": 300,"Protocol": "-1","RuleAction": "deny","CidrBlock": "0.0.0.0/0""Egress": true,"From": 1024,"To": 65535

Refer to the exhibit. A network engineer reviews the NACL entries for a subnet. What is the effect of this NACL on inbound traffic?

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

✓

Only SSH from the internal network and HTTPS from any IP are allowed.

Inbound rules: Rule 100 allows SSH from 10.0.0.0/16 (internal network). Rule 200 allows HTTPS from 0.0.0.0/0 (any IP). Rule 300 (implicit deny) denies all other inbound traffic. Therefore, only SSH from the internal network and HTTPS from any IP are allowed. Option B is incorrect because not all inbound traffic is allowed; SSH from external networks is denied. Option C is incorrect because HTTPS is allowed from anywhere. Option D is incorrect because the NACL does not deny all traffic; it allows specific traffic.

Answer analysis

Option-by-option breakdown

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

  • ✓

    Only SSH from the internal network and HTTPS from any IP are allowed.

    Why this is correct

    Inbound rules allow SSH from 10.0.0.0/16 and HTTPS from 0.0.0.0/0.

  • ✗

    All inbound traffic is allowed.

    Why it's wrong here

    There is a deny rule for all other traffic.

  • ✗

    Only HTTPS traffic is allowed from any IP.

    Why it's wrong here

    SSH from internal network is also allowed.

  • ✗

    All inbound traffic is denied.

    Why it's wrong here

    SSH and HTTPS are allowed.

Visual reference

192.168.1.0 /24 256 addresses (254 usable) 192.168.1.0 /25 Subnet A 128 addr (126 usable) 192.168.1.128 /25 Subnet B 128 addr (126 usable) Borrowing 1 bit from host portion creates 2 subnets (/25)

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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.