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GCDL Practice Question: An architect is evaluating trade-offs between…
This GCDL practice question tests your understanding of an architect is evaluating trade-offs between…. 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.
An architect is evaluating trade-offs between using Google Cloud's global network backbone for application traffic versus routing traffic over the public internet. She notes that Google's global network is one of the largest private networks in the world. What is the primary performance advantage of routing application traffic over Google's private backbone?
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
Using Google's backbone eliminates the need for application-level TLS encryption because the network is inherently secure
Even on Google's private backbone, application-level TLS encryption is recommended and used. Physical network ownership doesn't eliminate the need for encrypted application protocols.
B
Distractor review
Google's private backbone uses faster optical fiber than public internet service providers
Both Google's backbone and ISPs use optical fiber. The speed of light is constant. The advantage is not fiber speed but routing quality: fewer hops, no internet congestion, more direct paths.
C
Best answer
Traffic on Google's private backbone avoids public internet congestion and variable routing, providing consistently lower latency and higher throughput for traffic between regions and to users near Google PoPs
This correctly identifies the advantage. Public internet traffic traverses multiple autonomous systems with variable congestion. Google's backbone provides a direct, high-quality path between regions. Applications using Cloud CDN or global load balancers benefit from traffic entering Google's network early and staying on the backbone.
D
Distractor review
Google's private backbone is free for customers while public internet egress incurs data transfer charges
This is the opposite of the truth. Google charges for egress from its network. Traffic that stays within Google's backbone (between regions) still incurs inter-region data transfer costs.
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.
Related practice questions
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More questions from this exam
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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: Traffic on Google's private backbone avoids public internet congestion and variable routing, providing consistently lower latency and higher throughput for traffic between regions and to users near Google PoPs — Google's global private backbone connects all Google Cloud regions and major internet exchange points. Traffic entering Google's network at the closest point of presence (PoP) to the user travels entirely over Google's private fiber — avoiding the variable congestion, unpredictable routing, and packet loss that characterize the public internet. This provides consistently lower latency and higher throughput for intercontinental traffic.
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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This GCDL practice question is part of Courseiva's free Google Cloud 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 GCDL exam.