What is an Absolute Domain Name?
An absolute domain name (ADN) is a fully qualified domain name (FQDN) that specifies the exact location of a resource on the internet. It consists of a series of labels separated by dots, with the rightmost label representing the top-level domain (TLD). For example, in the domain name “www.example.com”, “www” is a subdomain, “example” is the second-level domain (SLD), and “com” is the TLD. The ADN provides a unique global address that can be used to access websites or other network resources.
Basic Concepts in DNS
The Domain Name System (DNS) is a vital component of the internet that translates human-readable domain names into IP addresses that machines can understand. Here are some basic concepts to help understand how DNS works:
1. DNS Server: DNS servers are responsible for maintaining a database of domain names and their corresponding IP addresses. They handle queries from clients and provide the necessary DNS information.
2. Domain Name Registrar: Registrars are organizations authorized to register domain names on behalf of individuals or companies. They interact with the domain name registries and manage the registration process.
3. Domain Name Registry: Registries are authoritative databases that store information about domain names. They manage the allocation and registration of domain names within specific TLDs.
4. Resolving DNS: When a user enters a domain name in their browser, it initiates a DNS resolution process. During resolution, the DNS server translates the domain name into an IP address by querying other DNS servers in a hierarchical manner.
5. Root Zone: The root zone is at the top of the DNS hierarchy and contains information about the authoritative servers for all top-level domains. It helps in resolving queries for domains at the root or TLD level.
6. Name Resolution: Once the IP address is retrieved, the name resolution process allows the user’s device to establish a connection to the desired resource on the internet, such as a website or an email server.
Understanding these basic concepts of DNS is crucial for comprehending how domain names are managed, how queries are resolved, and how the internet operates as a whole.
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