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GCDL Practice Question: A company's SRE team sets an SLO of 99.5% monthly…
This GCDL practice question tests your understanding of a company's sre team sets an slo of 99.5% monthly…. 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 company's SRE team sets an SLO of 99.5% monthly availability for a non-critical internal tool. A business stakeholder argues the target should be 99.99%. The SRE team pushes back. Which SRE argument best supports keeping the 99.5% target?
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
Distractor review
The team should set 99.5% now and plan to increase it to 99.99% next quarter when the tool becomes more popular
While SLOs can be revisited, this doesn't address the stakeholder's argument. The SRE's response should articulate why 99.5% is appropriate now based on the tool's business criticality, not promise future escalation.
B
Distractor review
Higher SLOs are always more expensive to achieve and the company cannot afford cloud infrastructure that provides 99.99% availability
Google Cloud infrastructure itself is highly available — 99.99% is achievable but requires architectural effort (multi-zone, failover, redundancy). The argument is about whether the effort is proportionate to the value, not cloud infrastructure cost.
C
Best answer
For a non-critical internal tool, 99.99% reliability requires disproportionate engineering investment (redundancy, 24/7 on-call, chaos testing) compared to its business value; 99.5% matches the actual reliability need while preserving engineering capacity for higher-value work
This is the SRE argument. Reliability is not free — achieving 99.99% requires architectural complexity, 24/7 on-call readiness, and ongoing reliability engineering. For an internal tool, this investment would consume engineering time that could build features users value more. The SLO should match what the business actually needs, not maximize reliability for its own sake.
D
Distractor review
Google Cloud cannot provide 99.99% availability for any service, so the SLO must be kept lower
Google Cloud's managed services do achieve 99.99%+ availability. The argument against 99.99% for this tool is about engineering investment proportionality, not platform capability limits.
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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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 traditional retailer currently maintains its own data centers, purchasing servers every 3–5 years and paying for facilities, power, and staff regardless of demand. When it migrates its workloads to the public cloud, which change in cost model does it experience?
Question 2
An e-commerce company plans its infrastructure for peak shopping events (e.g., Black Friday) which drive 50× normal traffic. On-premises, they must maintain 50× capacity year-round. In the cloud, they provision 50× capacity only during peak periods. Which cloud characteristic enables this cost optimization?
Question 3
Which term describes the process by which organizations integrate digital technology into all areas of their business, fundamentally changing how they operate and deliver value to customers?
Question 4
When a company moves from maintaining its own data center to using Google Cloud, which operational responsibility does Google assume that the company previously managed?
Question 5
A hospital runs a patient records system that must remain on-premises due to strict regulatory data residency requirements. However, they also want to use cloud-based AI for diagnostic imaging analysis. Which cloud deployment model best describes their architecture?
Question 6
What is virtualization in the context of cloud computing, and why is it fundamental to how cloud providers deliver services?
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FAQ
Questions learners often ask
What does this GCDL question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: For a non-critical internal tool, 99.99% reliability requires disproportionate engineering investment (redundancy, 24/7 on-call, chaos testing) compared to its business value; 99.5% matches the actual reliability need while preserving engineering capacity for higher-value work — In SRE, higher availability requires more engineering investment in redundancy, fault tolerance, and operational readiness — which takes time away from feature development. For a non-critical internal tool, 99.99% (4.3 minutes/month downtime allowance) may be overkill: the cost to achieve and maintain it (24/7 on-call, full redundancy, chaos testing) is disproportionate to the business value. The SLO should match the actual reliability needs, leaving error budget for maintenance and innovation.
What should I do if I get this GCDL 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 GCDL NAT questions on configuration and troubleshooting.
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