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DNS: Domain Name System Fundamentals

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Questions and Answers

Which function does DNS primarily serve in network communication?

Encrypting data transmitted over the internet
Converting domain names to IP addresses (correct)
Managing network routing protocols
Controlling access to network resources

If a DNS server fails to resolve a domain name, what is the typical next step in the resolution process?

The client immediately displays an error message.
The domain registrar is automatically contacted.
The client searches its local cache indefinitely.
The query is forwarded to a root DNS server. (correct)

What is the primary purpose of a DNS resolver?

To perform iterative or recursive queries to find the IP address for a domain name (correct)
To prevent unauthorized access to domain name records
To translate IP addresses back into domain names
To maintain a database of all domain names

Which type of DNS record is used to map a domain name to an IPv6 address?

AAAA record (B) Signup and view all the answers

What is the function of a DNS cache?

To temporarily store DNS records to speed up future lookups (A) Signup and view all the answers

Which of the following best describes 'DNS propagation'?

The time it takes for DNS changes to update across the internet (C) Signup and view all the answers

What is the purpose of a 'Time To Live' (TTL) value in a DNS record?

To indicate how long a DNS record should be cached (D) Signup and view all the answers

Which DNS record type is responsible for defining the mail servers that accept email messages for a domain?

MX record (D) Signup and view all the answers

What security concern is addressed by DNSSEC (DNS Security Extensions)?

Validating the authenticity and integrity of DNS data (B) Signup and view all the answers

How does a CNAME (Canonical Name) record function within DNS?

It acts as an alias, pointing one domain name to another. (C) Signup and view all the answers

Flashcards

What does DNS stand for?

Domain Name System. It translates domain names to IP addresses, enabling users to access websites using names instead of numbers.

Study Notes

DNS stands for Domain Name System.

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