Design: How Does DNS Work?

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Useful Websites to check DNS:

Q: What are CNAME and A records?

  • A record: points a name to specific public ip(s).
  • CNAME(Canonical Name) record: points to another name, instead of ip.

CNAME and A records are the most frequent ones we will manage.

People can use names instead of ip addresses to find our websites in an easier way.
e.g:  CNAME    CNAME        A

See more in wikipedia

Q: What is NS record and SOA?

You must use your own primary nameservers to manage your DNS records.

SOA(Start of Authority record): Every domain must have a Start of Authority record at the cutover point where the domain is delegated from its parent domain. (See more)

Denny-mac:denny mac$ dig NS

; <<>> DiG 9.8.3-P1 <<>> NS
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54520
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;			IN	NS

;; ANSWER SECTION:		3599	IN	NS		3599	IN	NS

;; Query time: 128 msec
;; WHEN: Fri Mar  2 14:41:45 2018
;; MSG SIZE  rcvd: 84

Q: Explain the workflow of domain transfer.
How to switch authorized server? Nameserver.

SOA and NS?

Q: What is TXT record?

Design: How Does DNS Work

dig NS
dig MX
dig SOA

Q: What is MX record?

wikipedia: List of DNS record types

Q: AWS Route53 Routing policy

Design: How Does DNS Work

Q: Diversity of different DNS services.

Route 53 DNS vs GoDaddy?

Q: How does DDoS attack work with Cloudflare DNS protection?


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