DNS Caching and DNS Servers in Chrome

Where is the first location checked for a requested DNS record?

Browser cache

What is the process inside the operating system that handles DNS queries?

DNS client

Where does a stub resolver send a DNS query if it doesn't have the record in its cache?

ISP DNS recursive resolver

What do DNS records provide information about for a domain?

IP address association and request handling Signup and view all the answers

What is the purpose of DNS syntax in DNS records?

Commands for DNS server Signup and view all the answers

Where do authoritative DNS servers store DNS records?

"Zone files" Signup and view all the answers

What is the purpose of DNS caching?

To improve performance and reliability for data requests Signup and view all the answers

Where does DNS caching occur?

In a variety of locations closer to the requesting client Signup and view all the answers

What is the purpose of setting a time-to-live (TTL) for DNS records?

To control how long data is stored in caches Signup and view all the answers

Why do modern web browsers cache DNS records?

To reduce processing steps and speed up DNS resolution Signup and view all the answers

Which scenario describes DNS caching?

Storing data closer to clients for faster resolution Signup and view all the answers

How does DNS caching help in reducing load times?

By resolving DNS queries earlier Signup and view all the answers

What type of query requires a DNS server to respond to the client with either the requested resource record or an error message?

Recursive query Signup and view all the answers

Which query type allows a DNS server to return the best answer it can, or if there's no match, a referral to an authoritative server for a lower level of the domain namespace?

Iterative query Signup and view all the answers

What is the purpose of caching resolvers in the DNS process?

To temporarily store DNS records for faster future lookups Signup and view all the answers

In which scenario would a DNS name server return a non-recursive query?

When the DNS client requests it and cached data is present Signup and view all the answers

Why might using a combination of recursive and iterative queries optimize the DNS resolution process?

To improve lookup times by leveraging different query types Signup and view all the answers

If a queried DNS server does not have a match for the query name, what will it do in an iterative query scenario?

Refer to another authoritative server for a lower level domain namespace Signup and view all the answers