World of Computer Networking Your CCNA start - Domain Name System (DNS) Query Resolution Process

The video tutorial explains the step-by-step process of DNS query resolution. It covers how a DNS resolver handles requests, checks its cache, and interacts with root, TLD, and authoritative name servers to resolve domain names to IP addresses. The tutorial also discusses caching mechanisms, expiration times of DNS records, and different types of DNS records, such as A and quad A records.

What is the first step in the DNS resolution process?

• The host sends a DNS request to the DNS resolver.

• The DNS resolver checks its cache.

• The host queries the root name server.

• The DNS resolver queries the authoritative name server.

If a DNS resolver's cache is empty, what is its next step?

• It queries the authoritative name server.

• It sends a request to the root name server.

• It sends a request to the client.

• It queries the TLD name server.

What information does the root name server provide to the DNS resolver?

• The location of the authoritative name server.

• The IP address of the domain.

• The location of the TLD name server.

• The expiration time of the DNS record.

What does the authoritative name server provide to the DNS resolver?

• The IP address of the domain.

• The location of the root name server.

• The expiration time of the DNS record.

• The location of the TLD name server.

What is the purpose of caching DNS records?

• To reduce the load on the authoritative name server.

• To ensure the DNS resolver always queries the root server.

• To increase the time taken for DNS resolution.

• To prevent the DNS resolver from storing any data.

Which DNS record type points to an IPv4 address?

• MX record

• A record

• CNAME record

• Quad A record

What is typically hardcoded in every DNS resolver?

• Information about all authoritative name servers.

• Information about all TLD name servers.

• Information about all DNS clients.

• Information about all root name servers.