Assume that no resource records are cached across the dns...

Name: assume that no resource records are cached across the dns servers if a server has no clue about where to find the address for a hostname what does it do question 10 options none of the menti 57384
Uploaded: 2023-05-29T05:01:57-08:00
Duration: 11 min 59 s
Channel: Akash M
Description: assume that no resource records are cached across the dns servers if a server has no clue about where to find the address for a hostname what does it do question 10 options none of the menti 57384

Assume that no resource records are cached across the DNS servers, if a server has no clue about where to find the address for a hostname, what does it do? Question 10 options: None of the mentioned The server asks its adjacent server The server asks the root server The request is not processed Hide hint for Question 10 Think about the respective querying sequence in both DNS recursive and iterative querying scenarios.

Transcript

00:01 In the recursive case, the process of the client obtaining the ip address of the hostname www .cnn, we'll see that what are the steps involved in this.

00:16 So in the recursive case, as said in the question, the process of the client obtaining the ip address of the hostname, that is www .cnn.

00:50 So we'll see what are the steps involved for this recursive case.

01:00 So first step, we'll see all the steps one by one.

01:04 So first is the client's request.

01:08 So the client's request initiates, that is the client initiates a request to its configured dns server.

01:30 They initiate a request to its configured dns resolver.

01:45 Now here, this resolver is usually provided by the isp or network administration.

01:52 To resolve the hostname, that is www .cnn.

01:56 Next is the root dns server.

02:05 Root dns server.

02:11 Now the dns resolver not having the ip address contacts a root dns server.

02:18 So a dns resolver, dns resolver, who is not having the ip address, that is not having the ip address to the main hostname, to hostname that is www .cnn, they will be, they will contact a root dns server.

03:03 Now here, the root dns server is responsible for providing information about the top level domain servers.

03:15 They provide information about the top level domain servers.

03:34 They are also called as tld servers.

03:41 So our next point is going to include the tld dns servers.

03:46 So the next point is tld dns server.

03:55 Here, the root dns server, that is this root dns server, responds to the resolver with the ip address of the tds, tld dns server.

04:07 So here what is done is that the root dns server will respond to the resolver with the ip address of, with ip address of this tld dns server.

04:48 Now this tld dns server is responsible for the dot com.

04:56 So the resolver then queries the tld dns server for further information.

05:03 Now let us look at the next step, that is authoritative dns server.

05:14 Authoritative dns server.

05:19 Here, the tld dns server responds to the resolver with the ip address of the authoritative dns server for the cnn .domain, dot com domain.

05:35 Okay.

05:35 So the tld dns server here will respond to the resolver, respond to the resolver with the ip address, in this case the ip address of the authoritative dns server.

05:54 So the ip address of authoritative dns server.

06:06 So what does this do? this authoritative dns server is responsible for, is responsible for the cnn .com domain...

Question

Please give Ace some feedback