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Internet, web and networks I · Lesson 04 / 10

DNS: finding by name

Names are easier to remember than addresses. What helps find the destination?

Learning paths12 min

Let's discover together

  1. 1

    DNS organizes information about domain names. To connect to a service, programs may query A (IPv4) or AAAA (IPv6) records for addresses. DNS has other record types; it is not merely a list of pages.

  2. 2

    A resolver looks up the needed information and may reuse a cached answer while valid. Names can map to several addresses, and different names can share an address. The relation need not be one-to-one.

  3. 3

    Receiving an address through DNS does not deliver HTML, log you in or prove the service works. Appropriate communication and a response are still needed.

  4. 4

    For a resolution failure, first check spelling and context. Do not change DNS, firewall or router just to complete this lesson. The local project uses 127.0.0.1: this loopback address avoids external DNS dependence.

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Official links and next step

✦
YOUR MISSION

Understand name resolution without confusing it with loading a page.

Now it's your turn

Discovery workshop

Observe before concluding

In a fictional trial, DNS found an address, but a connection was not established.
Build your answers and check when you are ready.
A moment to understand

Does knowing the address guarantee the resource exists?

I need a hint

Return to the evidence: what was observed and what is still unknown?

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Take it with you

Draw name → resolution → address → communication. Mark where the trial stopped and write one useful additional observation.

At your own pace

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