TryHackMe — Networking Core Protocols | Cyber Security 101 (THM)

DNS: Remembering Addresses

The Domain Name System (DNS) maps domain names to IP addresses, allowing users to access websites without memorizing IPs. DNS operates at the Application Layer (Layer 7) and uses UDP and TCP port 53. Key DNS record types include:

1. A Record: Maps a hostname to an IPv4 address.
2. AAAA Record: Maps a hostname to an IPv6 address.
3. CNAME Record: Maps one domain name to another.
4. MX Record: Specifies the mail server for a domain.

When a user types a domain, the browser queries the DNS server for the corresponding records. Tools like nslookup can be used to find IP addresses associated with a domain.

Answer the questions below

1. Which DNS record type refers to IPv6?

• AAAA

1. Which DNS record type refers to the email server?

• MX

WHOIS

WHOIS allows users to look up registered domain information, including the entity that registered the domain and their contact details. When you register a domain, you can set various DNS records like A, AAAA, and MX. Accurate contact information is required, but privacy services can conceal this information in WHOIS records. You can access WHOIS records online or through the command-line tool whois on Linux.