Understanding the Domain Name System (DNS) and How It Works
Explore the Domain Name System (DNS), its role in mapping domain names to IP addresses, preparing for attacks, common DNS record types, and essential resources. Learn how DNS facilitates communication over the internet and enhances online accessibility.
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Presentation Transcript
Domain Name System (DNS) The internet is made up of computers that are set up in large networks around the world These networks are connected by a web of underground and sometimes undersea wires Computers communicate with each other using strings of numbers Internet protocol or IP Addresses IP functions like street address identify where device is located on the internet
Domain Name System (DNS) For human it is hard to remember all these random bunch of numbers DNS translates human friendly domain names Once we enter domain name, browser and PC determine if this domain has related IP address in browser s database If domain was not found in local memory, browser goes out to the internet where it asks a series of DNS servers (if they have this domain name in their database)
Attack preparation Gathering information about the target Each of the DNS records can give bit of information about the target The more information attacker get from the upfront, the better attacker is prepared for the attack Security of DNS server is very important and sometimes ignored by many network administrators
Common DNS records types A (address) record - maps a domain name to the IP address SOA (Start of Authority) DNS server responsible for the domain info NS (Name server) identifies name servers for domain PTR (Pointers) maps IP address to a domain name MX (Mail Exchange) mail server for domain CNAME (canonical Name) additional names for the domain (www.)
Sources and materials What is DNS: https://www.youtube.com/watch?v=72snZctFFtA DNS Dumpster: https://dnsdumpster.com/ DNS Stuff: https://tools.dnsstuff.com/
