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+--- Thread: CCNA: QID:AND48 (/thread-2354.html)
CCNA: QID:AND48 - johnny7soto - 06-27-2024
This drag and drop question asks about the order of a DNS query. The answer currently show as 'right' has steps 2 and 3 backwards. How could the DNS request something from the domain DNS server before it knows it's address? It doesn't receive that until it's requested it from the root DNS server. The correct answer is as follows:
Step 1 => An endpoint submits a request for the IP address of a domain name
Step 2 => The DNS submits a request to a root DNS server
Step 3 => The DNS submits a request to the domain DNS server
Step 4 => The DNS receives a reply from the domain DNS server
Step 5 => The DNS responds to the endpoint
There are actually other steps that are skipped depending on how detailed you want to get, but the correct order of the provided event is above. And example of a skipped step is that a DNS server first checks it's cache for unexpired entries to possible provide an answer to the endpoint immediately.
Here are two links that backup this answer.
https://totaluptime.com/kb/how-does-a-dns-query-work/
https://www.cloudns.net/wiki/article/254/
RE: CCNA: QID:AND48 - help_desk - 06-28-2024
The question has been updated, Thank you!