| 1 | [DNS Exercise 2.2] DNS Worksheet |
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| 2 | |
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| 3 | Domain name to test: __________________________________ Query type: "A" |
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| 4 | |
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| 5 | 1. Start at any root server |
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| 6 | dig +norec @k.root-servers.net. _____________________ a |
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| 7 | |
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| 8 | 2. Referral: what NS records were returned in the "authority" section? |
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| 9 | |
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| 10 | Write them down. |
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| 11 | |
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| 12 | 3. Repeat your query for every NS record found in step 2. |
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| 13 | Was the response a referral or a final authoritative answer? |
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| 14 | |
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| 15 | Write the response down. |
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| 16 | |
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| 17 | a) Did every server respond? |
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| 18 | b) Were the responses the same? |
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| 19 | |
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| 20 | 4. If step 3 was a referral, repeat again for every NS record found. |
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| 21 | |
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| 22 | Write the responses down. |
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| 23 | |
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| 24 | a) Did every server respond? |
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| 25 | b) Were the responses the same? |
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| 26 | |
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| 27 | Continue for further referrals if necessary. |
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| 28 | |
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| 29 | 5. Checklist: |
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| 30 | |
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| 31 | a) Did all the nameservers give a response? |
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| 32 | b) Did they all give either a referral to a subdomain, or an AA (Authoritative |
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| 33 | Answer)? |
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| 34 | |
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| 35 | c) Were all the answers from each group of nameservers the same? |
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| 36 | d) Did each group consist of at least two nameservers on two different networks? |
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| 37 | e) For the final set of authoritative servers: did the list of NS records in the |
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| 38 | f) Authority Section match the list of nameservers in the referral from above? |
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| 39 | g) Were the TTL values reasonable? |
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