ACE Practice Question: A startup processes uploaded videos — each video…
This ACE practice question tests your understanding of a startup processes uploaded videos — each video…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 startup processes uploaded videos — each video upload triggers transcoding that takes 5–30 minutes. Users should get an immediate response after upload, not wait for transcoding. The transcoding system must handle burst uploads. Which architecture fits?
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.
Best answer
Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously
The user gets an instant acknowledgment. Cloud Pub/Sub buffers the jobs. Autoscaling workers consume messages and transcode — decoupled, scalable, and burst-tolerant.
Distractor review
Deploy the transcoding directly in the API server and scale the API server horizontally for bursts
Running transcoding in the API server blocks API threads, consumes excessive API server resources, and creates a poor user experience during burst uploads.
Distractor review
Use Cloud Spanner to store video metadata and transcode synchronously in a Cloud SQL stored procedure
Database stored procedures are not designed for video transcoding — this is the wrong architecture for media processing.
Distractor review
Upload the video and synchronously wait for transcoding to complete before responding
Synchronous processing requires the user to wait 5–30 minutes — a poor user experience and a connection timeout risk.
Common exam trap
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.
Technical deep dive
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.
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously — Decoupling the upload response from the long-running transcoding via an async message queue (Cloud Pub/Sub or Cloud Tasks) allows immediate user response. The transcoding workers consume jobs from the queue independently, handling bursts by autoscaling. This is the standard async processing pattern.
What should I do if I get this ACE 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 ACE NAT questions on configuration and troubleshooting.
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