This CKAD practice question tests your understanding of application design and build. 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 pod named 'app' has a container that logs to stdout. You want to add a sidecar container that streams these logs to a centralized logging service. Which pattern does this represent?
Ambassador pattern
Why wrong: Ambassador proxies network traffic, not logs.
Adapter pattern
Why wrong: Adapter normalizes output across containers, but a log shipper is typically a sidecar.
Sidecar pattern
A sidecar container runs alongside the main container to provide additional functionality like log shipping.
Init container pattern
Why wrong: Init containers run to completion before the main container starts.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Sidecar pattern
A sidecar container that enhances the primary container (e.g., log shipper) is a classic sidecar pattern.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Ambassador pattern
Why it's wrong here
Ambassador proxies network traffic, not logs.
Adapter pattern
Why it's wrong here
Adapter normalizes output across containers, but a log shipper is typically a sidecar.
Sidecar pattern
Why this is correct
A sidecar container runs alongside the main container to provide additional functionality like log shipping.
Related concept
Static NAT maps one inside address to one outside address.
Init container pattern
Why it's wrong here
Init containers run to completion before the main container starts.
Common exam traps
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.
Trap categories for this question
Command / output trap
Adapter normalizes output across containers, but a log shipper is typically a sidecar.
Detailed technical explanation
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.
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
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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 CKAD NAT questions on configuration and troubleshooting.
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FAQ
Application Design and Build — This question tests Application Design and Build — Static NAT maps one inside address to one outside address..
The correct answer is: Sidecar pattern — A sidecar container that enhances the primary container (e.g., log shipper) is a classic sidecar pattern.
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 CKAD NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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