The AWS solutions architect certification shows that you can use AWS services to solve software engineering problems and understand core best practices of the industry. In this article, I will quiz you on some sections from the material required for the exam: DNS and Route53.
I will now briefly state some key facts about DNS and the Route53 service, and then provide some example questions for the exam.
N.B: The following information on its own will not be enough to answer the questions.
Internet communication uses IP addresses. A Domain Name System allows human friendly names, such as https://T3chFlicks.org, to be translated into a network address (IP) of the CloudFront distribution server hosting the files. A fully qualified domain name (FQDN) is comprised of components, as shown in the following diagram:
The DNS system is hierarchical and follows a resolution processes to find the domain servers. These map the domain to IP address.
- Your browser queries a resolving DNS server for an IP address of t3chflicks.org.
- If the resolving DNS server does not have the address, it performs the same query on a root server.
- If the root server response is that it doesn’t have the address either, it provides the
.orgTLD server address.
- The resolving server queries the TLD server. If the TLD server does not know the address of the domain name, it provides the address of the resolving name server.
- The resolving server then queries the resolving name server. The resolving name server contains the authoritative records and sends these to the resolving server.
- The resolving name server returns this information to the user’s web browser.
The Route53 service allows users to get a domain and manage their DNS as well as perform health checks.
It is also useful to know:
- Hosted zone (zone file) is a collection of record sets and can be private or public.
- Record Types: SOA, A /AAAA, CNAME, MX, NS, PR, SPF, TXT, SRV
- An Alias Route is a special AWS record which allows mapping to AWS resource including CloudFront distributions.
- Route53 offers weighted routing, latency-based routing and geolocation routing. It also offers failover routing, disaster recovery using different resources.
- Elastic load balancer is available in every AWS region with cross-zone balancing.
Thanks For Reading
We hope to cover the rest of the topics with similar articles very soon ⭐