Explain a Domain Lookup
Look up the exact name in the supplied directory and distinguish a missing record from a known address.
About 18 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
A domain name is a readable name used in network requests. DNS supplies information used to locate the relevant service, often an address. It does not verify the truth of a page or replace authorization. Our paper directory is a simplified local lookup table, not a real DNS service.
Look up the exact name in the supplied directory and distinguish a missing record from a known address. A resolved address does not prove a service is trustworthy.
Use this supplied case: Name fox. Directory: fox→10.0.0.2; owl→10.0.0.3; bee→10.0.0.4; others absent. Lookup result? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Look up the exact name in the supplied directory and distinguish a missing record from a known address.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Name fox. Directory: fox→10.0.0.2; owl→10.0.0.3; bee→10.0.0.4; others absent. Lookup result? The supported answer is 10.0.0.2. The described evidence matches 10.0.0.2. Look up the exact name in the supplied directory and distinguish a missing record from a known address. A resolved address does not prove a service is trustworthy. A domain name is a readable name used in network requests.
Check your reasoning
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Helpful tips
- Look up the exact name in the supplied directory and distinguish a missing record from a known address.
- A resolved address does not prove a service is trustworthy.
See the answer and explanation
10.0.0.3
The supplied case states: Name owl. Directory: fox→10.0.0.2; owl→10.0.0.3; bee→10.0.0.4; others absent. Lookup result? Under the stated distinction, this identifies 10.0.0.3. A domain name is a readable name used in network requests. DNS supplies information used to locate the relevant service, often an address. It does not verify the truth of a page or replace authorization. Our paper directory is a simplified local lookup table, not a real DNS service. Look up the exact name in the supplied directory and distinguish a missing record from a known address.
Take it further
New directory: seal→10.0.0.8; others absent. Expected: seal lookup finds the stated address; otter has no supplied record. Neither result authenticates content.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
Your choices are temporary. Feedback appears after you check all the answers.
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Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.