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Question 870 of 1,733

Technology →hardMultiple ChoiceObjective-mapped

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.

A company runs its SAP S/4HANA system on AWS using a multi-node HANA scale-out configuration. After a recent OS update, the application layer cannot connect to the HANA database. The HANA database processes are running, but the SAP application servers report 'communication failure' errors. Initial checks show that the security group rules allow traffic on the required ports. 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 DNS resolution is misconfigured after the OS update, causing hostname lookup failures.
Why wrong: DNS could be a factor, but typically /etc/hosts is used in SAP environments.
B
The NTP synchronization is off, causing time drift and authentication errors.
Why wrong: Time drift would cause authentication issues, but not directly communication failure.
C
The OS update has reset the iptables firewall rules, blocking internal HANA ports.
OS updates can clear iptables rules, blocking required ports even if security groups allow traffic.
D
The SAP system is not correctly licensed for the new OS version.
Why wrong: Licensing issues do not cause communication failures between application and database.

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 OS update has reset the iptables firewall rules, blocking internal HANA ports.

Option C is correct because OS updates on Linux systems often reset or flush iptables firewall rules to their default state, which typically blocks all inbound traffic on non-essential ports. In a multi-node HANA scale-out configuration, internal HANA communication relies on specific TCP ports (e.g., 3xx01–3xx10 for internal network traffic). When iptables rules are reset, these ports become blocked, preventing the SAP application layer from connecting to the HANA database even though the database processes are running and security group rules at the AWS level are correctly configured.

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 DNS resolution is misconfigured after the OS update, causing hostname lookup failures.
Why it's wrong here
DNS could be a factor, but typically /etc/hosts is used in SAP environments.
✗
The NTP synchronization is off, causing time drift and authentication errors.
Why it's wrong here
Time drift would cause authentication issues, but not directly communication failure.
✓
The OS update has reset the iptables firewall rules, blocking internal HANA ports.
Why this is correct
OS updates can clear iptables rules, blocking required ports even if security groups allow traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The SAP system is not correctly licensed for the new OS version.
Why it's wrong here
Licensing issues do not cause communication failures between application and database.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often focus on AWS-level security groups or DNS issues, overlooking the fact that OS-level firewalls (iptables) are reset during updates and can block internal HANA ports even when security groups are correctly configured.

Detailed technical explanation

How to think about this question

In a multi-node HANA scale-out, internal communication uses the 'internal network' (e.g., 10.0.0.0/8) with specific ports like 3xx01 for name server, 3xx02 for preprocessor, and 3xx03–3xx10 for index server replication. The iptables firewall on each HANA node must allow these ports; a common default rule set after an OS update is to set the INPUT policy to DROP and only allow SSH (port 22). The 'iptables -L -n -v' command can be used to verify the current rules, and restoring them from a backup or reapplying the HANA-specific firewall rules resolves the issue.

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 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.

Quick reference

OSI Model Reference

Layer	Name	PDU	Key Protocols / Devices
7	Application	Data	HTTP, HTTPS, DNS, SMTP, FTP, SSH
6	Presentation	Data	TLS / SSL, JPEG, ASCII encoding
5	Session	Data	NetBIOS, RPC, SIP
4	Transport	Segment / Datagram	TCP, UDP
3	Network	Packet	IP, ICMP, OSPF — Routers
2	Data Link	Frame	Ethernet, Wi-Fi, PPP — Switches, Bridges
1	Physical	Bits	Cables, NICs, Hubs, Repeaters

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.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

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

What is the correct answer to this question?

The correct answer is: The OS update has reset the iptables firewall rules, blocking internal HANA ports. — Option C is correct because OS updates on Linux systems often reset or flush iptables firewall rules to their default state, which typically blocks all inbound traffic on non-essential ports. In a multi-node HANA scale-out configuration, internal HANA communication relies on specific TCP ports (e.g., 3xx01–3xx10 for internal network traffic). When iptables rules are reset, these ports become blocked, preventing the SAP application layer from connecting to the HANA database even though the database processes are running and security group rules at the AWS level are correctly configured.

What should I do if I get this PAS-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". 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.

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This PAS-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 PAS-C01 exam.