Network Configurations Lesson 002: DNS Part 1

What does DNS stand for?

Domain Name System.

Domain Name System

Foundational protocol that enables users to access websites using human-readable names instead of complex IP addresses.

What entity handles DNS?

ISP.

Who manages business DNS servers?

Often the business itself.

What does DNS allow?

The use of domain names instead of memorizing the dotted decimal notation of an IP address for each website visited.

What is the reason that DNS exists?

To convert domain names into IP addresses or IP addresses into domain names on behalf of the user.

What is the hierarchical system of DNS?

Root level, Top-level domain, Second-level domain, subdomains, and host level.

Root Level

The highest level of the DNS hierarchy and everything else falls underneath it.

What does TLDs stand for?

Top-level domains.

Top-Level Domains

Include common domains and all the country-specific domains.

Where do top-level domains fall in the DNS hierarchical system?

Between the root level and second-level domains.

What are examples of top-levels domains?

.com, .net, and .org.

What are examples of country-specific domains?

.uk or .fr.

Where do second-level domains fall in the DNS hierarchical system?

Between the top-level domains and the subdomains.

Second-Level Domains

Are usually purchased by a company or organization to create a human-readable name.

Where do subdomains fall in the DNS hierarchical system?

Between the second-level domains and the host level.

Subdomains

Additional subdivisions under the second-level domain.

Where does host level fall in the DNS hierarchical system?

Involves a specific device or server within the domain.

Host Level Domains

Are background domains that run in the background and can specify which server is being connected to.

What does FQDN stand for?

Fully Qualified Domain Name.

Fully Qualified Domain Name

Used to specify the exact address of a resource within the DNS hierarchical to ensure that the precise identification of web servers, email servers, and other services can occur.

What is needed to define a domain name as a FQDN?

A complete, precise address of a specific device or service within the DNS hierarchical.

What is usually included in a FQDN?

The root level domain, the top level domain, the second-level domain, and the subdomain.

Where are FQDNs most commonly used?

In web servers, email servers, and other network services.

Why would a FQDN be needed?

To provide clear, unique identification on the Internet or within a private network.