Trivia - DNS Records

The DNS (Domain Name System) database consists of several resource records. These records are usually referred to as DNS records. DNS records are text instructions that link a domain name to an IP address.

When the user types a URL into a browser, then DNS lookup is initiated. It will work through the hierarchical structure of the DNS until it reaches the DNS server for the specific domain. This server contains DNS records for that domain. Each domain at least has to have several DNS records associated with it, that help point the domain name into a certain service.

Here are some of the common DNS record types:

1.     A, maps a hostname to a 32-bit IPv4 address.

2.     AAAA, maps a hostname to a 128-bit IPv6 address.

3.     CNAME (Canonical Name), creates an alias name for a hostname. Both the original and alias hostname will point to the same IP address.

4.     MX (Mail Exchange), shows which mail servers that handle incoming email traffic related to the domain.

5.     NS (Name Server), shows the name of a registered domain and authoritative name server for that domain.

6.     SOA (Start of Authority), provides essential information for the current zone so that it can facilitate zone transfers.

7.     TXT (Text), contains plain text added by admins for specific purposes.

8.     PTR (Pointer), maps an IP address in in-addr.arpa domain to a hostname (reverse name resolution).

9.     SRV (Service), specifies server name and port number for a specific service available on the network.

 

Through different DNS records, we can gather different information. Therefore, learning about types of DNS records will be beneficial for our cybersecurity journey, especially when collecting information. Reviewing this topic will also strengthen our basic in Network. 

I think that's all for this page, thank you!

References:

Chapple, M., & Zacker, C. (2021). CompTIA Network+ Certification Kit: Exam N10-008. Sybex.

https://gcore.com/learning/dns-records-explained/