PAS-C01 Design of SAP Workloads on AWS Practice Question
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. 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 Basis administrator is configuring a high availability setup for SAP HANA on AWS using HANA System Replication (HSR) with automatic failover. The architecture includes a primary HANA node in us-east-1a and a secondary in us-east-1b. The administrator uses a Network Load Balancer (NLB) with a floating IP for the HANA virtual IP address. After a failover test, the secondary node becomes primary, but client applications cannot connect to the database. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The NLB target group is not configured to include the secondary node's IP address.
With NLB and floating IP, the target group must be configured with the secondary's IP address as a target. If the target group only contains the primary's IP, failover breaks. Option A (security group) would affect all connections, not just after failover. Option B (subnet) is possible but NLB can target cross-subnet. Option D (DNS) is not used because the virtual IP is handled by NLB. Option C is the most specific and common misconfiguration.
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 security group for the NLB does not allow inbound traffic on port 3<0xEB><0x9C><0x9D><0xEB><0x9E><0x80>13.
Why it's wrong here
Security groups do not apply to NLB; they apply to targets.
✗
The SAP HANA client is using a DNS name that does not resolve to the NLB endpoint.
Why it's wrong here
Clients should use the NLB DNS name or IP, not HANA hostname.
✓
The NLB target group is not configured to include the secondary node's IP address.
Why this is correct
Without the secondary as a target, NLB cannot route to it after failover.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
The secondary HANA node is in a different subnet and not routable from the NLB.
Why it's wrong here
NLB can target cross-subnet if the subnet is in the same VPC.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The NLB target group is not configured to include the secondary node's IP address. — With NLB and floating IP, the target group must be configured with the secondary's IP address as a target. If the target group only contains the primary's IP, failover breaks. Option A (security group) would affect all connections, not just after failover. Option B (subnet) is possible but NLB can target cross-subnet. Option D (DNS) is not used because the virtual IP is handled by NLB. Option C is the most specific and common misconfiguration.
What should I do if I get this PAS-C01 question wrong?
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.
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?
CIDR notation defines the prefix length.
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