The correct steps are to verify DNS or /etc/hosts resolution, check the SAP profile parameters for enqueue replication, and confirm the ERS service is running and reachable. After an OS patch, hostname mappings can change or be lost, so the secondary application server must resolve the ERS hostname correctly; otherwise, the enqueue replication connection fails even if the ERS process is alive. This scenario tests your understanding of SAP’s dependency on network name resolution and profile configuration in a multi-ABAP setup on AWS. On the PAS-C01 exam, a common trap is to jump to kernel or instance-level fixes, but the real issue is often a simple DNS miss or a missing enqueue/ replication parameter in the instance profile. Remember the mnemonic “DNS, Profile, Service” — always check these three before touching infrastructure.
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 SAP S/4HANA on AWS using a multi-ABAP application server setup with a central services instance (ASCS) and enqueue replication. After a recent OS patching, the secondary application server fails to start, with errors indicating it cannot connect to the enqueue replication server (ERS). The ERS process is running on the ASCS instance. The network team confirms that security groups and NACLs are properly configured. Which THREE steps should be taken to resolve this issue? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the SAP instance profile for the enqueue replication parameters (e.g., rdisp/enq_repl_server).
Option A is correct because the hostname resolution for the ERS instance may have changed after patching. Option C is correct because the SAP profile must contain the correct enqueue replication parameters. Option E is correct because the ERS service must be running and reachable. Option B is wrong because kernel compatibility is not typically affected by OS patching. Option D is wrong because changing the instance type is not a troubleshooting step for connectivity.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Change the secondary application server instance type to a larger size.
Why it's wrong here
Instance type change does not fix connectivity.
✓
Check the SAP instance profile for the enqueue replication parameters (e.g., rdisp/enq_repl_server).
Why this is correct
Profile parameters define ERS connection details.
Related concept
Static NAT maps one inside address to one outside address.
✓
Confirm that the ERS process (enre) is running on the ASCS instance and is listening on the correct port.
Why this is correct
The ERS service must be active.
Related concept
Static NAT maps one inside address to one outside address.
✓
Verify that the DNS or /etc/hosts file on the secondary application server resolves the ERS hostname correctly.
Why this is correct
Hostname resolution is critical for SAP communication.
Related concept
Static NAT maps one inside address to one outside address.
✗
Update the SAP kernel on the secondary application server to the latest version.
Why it's wrong here
Kernel update is unrelated to connectivity after patching.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Check the SAP instance profile for the enqueue replication parameters (e.g., rdisp/enq_repl_server). — Option A is correct because the hostname resolution for the ERS instance may have changed after patching. Option C is correct because the SAP profile must contain the correct enqueue replication parameters. Option E is correct because the ERS service must be running and reachable. Option B is wrong because kernel compatibility is not typically affected by OS patching. Option D is wrong because changing the instance type is not a troubleshooting step for connectivity.
What should I do if I get this PAS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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