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PAS-C01 Technology Practice Question

This PAS-C01 practice question tests your understanding of technology. 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.

An SAP system uses AWS Direct Connect to connect to on-premises systems. The SAP application servers are in a private subnet, and the HANA database is in a separate private subnet. Both subnets are in the same VPC. The application servers can connect to the HANA database, but the application servers cannot connect to an on-premises file server via the Direct Connect. The on-premises network team confirms that the file server is reachable from other on-premises resources. The VPC route tables have a route for the on-premises CIDR pointing to the Direct Connect virtual gateway. The security groups allow all outbound traffic. What is the MOST likely cause of the issue?

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.

A
The network ACL for the application subnet is blocking outbound traffic to the on-premises CIDR.
Why wrong: NACLs are stateless; if outbound is allowed, it should work.
B
The on-premises file server is not reachable because it requires VPN instead of Direct Connect.
Why wrong: Direct Connect is sufficient if properly configured.
C
The Direct Connect virtual interface is in a 'down' state.
Why wrong: If it were down, other on-premises resources would also be unreachable.
D
The route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway.
Missing route prevents traffic from reaching Direct Connect.

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 route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway.

The most likely cause is that the route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway. Since the application servers are in a different subnet, they need an explicit route in their subnet's route table to reach the on-premises network through Direct Connect. Without this route, traffic cannot be forwarded to the virtual gateway. Option A is unlikely because the security groups allow all outbound traffic, and NACLs might be blocking, but the question states security groups allow all outbound, and typically NACLs are configured permissive by default. Option C is not indicated as the on-premises team confirms the file server is reachable from other on-premises resources, implying Direct Connect is up. Option D (VPN) is not relevant; Direct Connect is already in use.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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 network ACL for the application subnet is blocking outbound traffic to the on-premises CIDR.
Why it's wrong here
NACLs are stateless; if outbound is allowed, it should work.
✗
The on-premises file server is not reachable because it requires VPN instead of Direct Connect.
Why it's wrong here
Direct Connect is sufficient if properly configured.
✗
The Direct Connect virtual interface is in a 'down' state.
Why it's wrong here
If it were down, other on-premises resources would also be unreachable.
✓
The route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway.
Why this is correct
Missing route prevents traffic from reaching Direct Connect.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Technology — This question tests Technology — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway. — The most likely cause is that the route table associated with the application subnet does not have a route to the on-premises CIDR via the virtual gateway. Since the application servers are in a different subnet, they need an explicit route in their subnet's route table to reach the on-premises network through Direct Connect. Without this route, traffic cannot be forwarded to the virtual gateway. Option A is unlikely because the security groups allow all outbound traffic, and NACLs might be blocking, but the question states security groups allow all outbound, and typically NACLs are configured permissive by default. Option C is not indicated as the on-premises team confirms the file server is reachable from other on-premises resources, implying Direct Connect is up. Option D (VPN) is not relevant; Direct Connect is already in use.

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely". 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?

CIDR notation defines the prefix length.

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