🔸Route 53

Describe about Route 53

Route 53 is a highly avialable , scalable fully manged and Authoritative DNS. In addition it is also a Domain Registrar and has ability to check the health of your resources.

Authoritative = the customer(you) can update the DNS records.

What is DNS ?

DNS which translates the human friendly hostnames into the machine IP addreses.

e.g

// Sample
www.google.com => 172.217.18.36

Explain DNS Domain

For full path : http://api.www.example.com

Url: http://api.www.example.com

Protocol: http

FQDN(Fully Qualified Domain Name): api.www.example.com

Sub Domain: api , www

Second Level Domain (SLD): example

Top Level Domain (TLD): com

Root Domain: example.com (SLD + TLD)

How DNS works ?

1. Browser ask the Local DNS server (Managed by ISP) .

2. ISP ask to Root DNS server: Do you know www.example.com ? then Root DNS said "You should ask TLD DNS server"

3. Next we ask to TLD DNS server: Do you know www.example.com? then TLD DNS said "I know only .com for more information you should ask SLD DNS server"

4. Next we ask to SLD DNS server: Do you know www.example.com? then SLD DNS said "I know only example.com .

5. Then we send to Destination IP address back to ISP and Browser.

6. Browser and Local DNS will cache the IP .