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Guide to Domain Name System (DNS)

The Domain Name System (DNS) is a core component of the internet infrastructure, serving as a directory for all internet resources.

Importance of DNS:
The DNS is essentially the phonebook of the internet. It translates human-friendly domain names like 'example.com' into IP addresses like 192.0.2.1 that computers use to identify each other on the network. Without DNS, users would need to memorize IP addresses to access websites, making internet navigation very difficult.

How DNS works:
When you enter a URL into your web browser, a DNS query is generated. This request is sent to your ISP's recursive DNS servers. These servers communicate with the authoritative DNS servers to find the correct IP address for the domain. Once the IP is obtained, the website's content is fetched and displayed to the user.

Exam tips:
When answering questions on DNS for an exam, keep the following points in mind:
- Understand the basics. Know how DNS works and why it's important- Understand DNS components. Be familiar with terms like 'authoritative DNS server', 'recursive DNS server', and 'DNS query'- Real-world applications. Understand how DNS is used in real-world scenarios, such as web browsing- Security and DNS. Consider DNS-related threats, such as DNS spoofing, and know how DNSSEC helps secure DNS.

Ensure you understand these concepts fully for a seamless exam experience on DNS related topics.

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Domain Name System (DNS) practice test

The Domain Name System (DNS) is a hierarchical, distributed database that translates human-readable domain names (e.g., www.example.com) into their corresponding Internet Protocol (IP) addresses. This allows users to access websites or other network resources using easily-remembered domain names instead of numerical IP addresses. DNS operates as a client-server system, where DNS clients send queries to DNS servers, which then resolve the requested domain name into an IP address. DNS is organized in a hierarchical structure comprising the root domain (.), top-level domains (e.g., .com, .org), and subdomains corresponding to individual organizations or users. DNS also supports various types of resource records, such as A records for IPv4 addresses, AAAA records for IPv6 addresses, and MX records for mail server information.

Time: 5 minutes   Questions: 5

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