← ANS-C01·Amazon Web Services

Question 207 of 1,705

Network Design →hardMultiple ChoiceObjective-mapped

ANS-C01 Network Design Practice Question

This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A company has a VPC with a CIDR block of 10.0.0.0/16. They have two subnets: Subnet A (10.0.1.0/24) and Subnet B (10.0.2.0/24). They launch an EC2 instance in Subnet A and assign it a primary private IP address of 10.0.1.50. They then attach a second elastic network interface (ENI) to the instance with a primary private IP of 10.0.2.100. The instance needs to send traffic from the second ENI. However, when the instance sends traffic from the second ENI, it fails. What is the MOST likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

A
The two ENIs are in different subnets, which is not allowed.
Why wrong: ENIs can be in different subnets.
B
The instance's operating system routing table does not have a route for the second ENI's subnet.
The OS routing table must have a route to send traffic from the second ENI through its own subnet.
C
The security group for the second ENI does not allow outbound traffic.
Why wrong: Security groups are stateful and allow outbound traffic by default.
D
The subnet route table does not have a route for the second ENI's IP address.
Why wrong: Subnet route tables handle traffic destined for other networks, not source-based routing.

Full breakdown with real-world context →

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

✓

The instance's operating system routing table does not have a route for the second ENI's subnet.

When an EC2 instance has multiple ENIs, the operating system's routing table must have explicit routes for each ENI's subnet to ensure traffic leaves via the correct interface. By default, the OS only adds a route for the primary ENI's subnet, so traffic from the second ENI (10.0.2.100) fails because the OS tries to send it out the primary ENI, which is in a different subnet. This is a common cause of asymmetric routing or connectivity failure.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

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

✗
The two ENIs are in different subnets, which is not allowed.
Why it's wrong here
ENIs can be in different subnets.
✓
The instance's operating system routing table does not have a route for the second ENI's subnet.
Why this is correct
The OS routing table must have a route to send traffic from the second ENI through its own subnet.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The security group for the second ENI does not allow outbound traffic.
Why it's wrong here
Security groups are stateful and allow outbound traffic by default.
✗
The subnet route table does not have a route for the second ENI's IP address.
Why it's wrong here
Subnet route tables handle traffic destined for other networks, not source-based routing.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the issue is with AWS networking components (security groups or route tables) rather than the instance's operating system routing, which is a common oversight in multi-ENI configurations.

Detailed technical explanation

How to think about this question

Under the hood, the OS uses the source IP address to determine which routing table entry to use; without a specific route for the second ENI's subnet, the kernel applies the default route (usually via the primary ENI), causing traffic to be sourced from the wrong IP or dropped by the VPC's source/destination check. In real-world scenarios, this is resolved by adding a custom route in the OS (e.g., 'ip route add 10.0.2.0/24 dev eth1') or by using policy-based routing to bind traffic to the correct interface.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

Visual reference

Quick reference

Asymmetric Encryption Algorithm Comparison

Algorithm	Key Exchange	Signatures	Equivalent Security Key	Notes
RSA-3072	Yes	Yes	128-bit	Widely deployed; slow for bulk data
ECDSA P-256	No	Yes	128-bit	Fast signatures; standard TLS certs
ECDH / ECDHE	Yes	No	128-bit	Perfect forward secrecy in TLS 1.3
DH / DHE	Yes	No	128-bit (3072-bit key)	Replaced by ECDHE in modern TLS
Ed25519	No	Yes	~128-bit	SSH keys, modern PKI

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Related ANS-C01 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Network Management and Operations practice questions

Practise ANS-C01 questions linked to Network Management and Operations.

Network Security, Compliance and Governance practice questions

Practise ANS-C01 questions linked to Network Security, Compliance and Governance.

Network Design practice questions

Practise ANS-C01 questions linked to Network Design.

Network Implementation practice questions

Practise ANS-C01 questions linked to Network Implementation.

ANS-C01 fundamentals practice questions

Practise ANS-C01 questions linked to ANS-C01 fundamentals.

ANS-C01 scenario practice questions

Practise ANS-C01 questions linked to ANS-C01 scenario.

ANS-C01 troubleshooting practice questions

Practise ANS-C01 questions linked to ANS-C01 troubleshooting.

Practice this exam

Start a free ANS-C01 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

ANS-C01 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The instance's operating system routing table does not have a route for the second ENI's subnet. — When an EC2 instance has multiple ENIs, the operating system's routing table must have explicit routes for each ENI's subnet to ensure traffic leaves via the correct interface. By default, the OS only adds a route for the primary ENI's subnet, so traffic from the second ENI (10.0.2.100) fails because the OS tries to send it out the primary ENI, which is in a different subnet. This is a common cause of asymmetric routing or connectivity failure.

What should I do if I get this ANS-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely", "primary". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

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.