Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
A distributed simulation launches 40 EC2 instances that exchange small packets frequently and are sensitive to cross-instance latency. The workload stays in one Availability Zone and can use the same instance family across nodes. Which two choices improve network performance the most? Select two.
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Launch all instances in a cluster placement group.
A cluster placement group places instances physically close together within one Availability Zone, which reduces inter-node latency and jitter. This is the standard AWS pattern for tightly coupled distributed workloads such as simulations, MPI-style jobs, and HPC clusters.
B
Distractor review
Place the instances across several Availability Zones for higher aggregate resilience.
Spreading instances across multiple Availability Zones increases network distance and adds more variability to packet delivery. That improves fault isolation, but it works against the low-latency requirement in this scenario.
C
Best answer
Choose an instance family with high network bandwidth and enhanced networking support.
Instance families with stronger network bandwidth and enhanced networking can move packets more efficiently and with lower latency. This matters for workloads that exchange frequent small messages, because the per-packet overhead and network throughput both affect end-to-end runtime.
D
Distractor review
Use a spread placement group to pack the instances tightly together.
Spread placement groups intentionally distribute instances across distinct underlying hardware to reduce correlated failure risk. They are useful for resilience, but they do not optimize east-west latency between the instances.
E
Distractor review
Put the workload behind CloudFront so internal node communication is faster.
CloudFront accelerates content delivery from edge locations to external clients. It does not improve east-west traffic between EC2 instances inside the same workload.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A team needs to distribute TCP traffic (not HTTP) across multiple services. The services must see the original client source IP for auditing. Which AWS load balancer is the best fit?
Question 2
A team wants to run containerized services with AWS-managed orchestration and autoscaling. They do NOT require Kubernetes compatibility. Which AWS service choice is most appropriate to meet these goals?
Question 3
A solutions architect is designing an S3 bucket for a IoT ingestion API. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure? The design must avoid adding custom operational scripts.
Question 4
A solutions architect is designing an S3 bucket for a claims portal. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?
Question 5
A team wants to delegate IAM management to developers, but must ensure developers can never grant themselves permissions beyond a specific limit. Which AWS mechanism best matches this requirement?
Question 6
A solutions architect is designing an S3 bucket for a healthcare document service. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?
FAQ
Questions learners often ask
What does this SAA-C03 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: Launch all instances in a cluster placement group. — For a tightly coupled simulation in a single Availability Zone, a cluster placement group is the best layout choice because it keeps instances physically close together and minimizes network latency. Pairing that placement strategy with an instance family that provides high network bandwidth and enhanced networking improves how quickly the nodes exchange messages. Together, those two choices directly address the workload's sensitivity to cross-instance communication delay. Why others are wrong: Spreading across Availability Zones improves resilience, not low-latency node-to-node traffic. Spread placement groups separate instances to reduce blast radius, which is the opposite of what a latency-sensitive cluster needs. CloudFront optimizes delivery to end users, but it does nothing for internal EC2 traffic.
What should I do if I get this SAA-C03 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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