Domain Name System (DNS)
DNS is a networking protocol that translates human-readable domain names into IP addresses. It acts like a phone book, enabling users to access websites and resources using easily memorable domain names instead of IP addresses. Amazon Route 53 is a highly available and scalable managed DNS service that supports routing domain names to Amazon EC2 instances, Elastic Load Balancers, and more. Route 53 provides domain registration, DNS routing, and health-checking services to help users effectively manage their domains and direct internet traffic to their AWS resources.
Guide to Understanding Amazon Route 53 and DNS for AWS Solution Architect Examination
Amazon Route 53 is a scalable cloud Domain Name System (DNS) web service. It is designed to provide reliable and cost-effective routing to your applications, websites, and other resources.
Why it is Important?
Route 53 provides the ability to connect user requests to infrastructure running in AWS, which includes EC2 instances, Elastic Load Balancers, and S3 buckets. Not only that, but it also works well with non-AWS infrastructure.
What it is?
Simply put, think of Route 53 as the phone book of the internet. Humans access websites using domain names, while web browsers interact using IP addresses. Route 53 bridges this gap by translating domain names to IP addresses – this process is known as DNS lookup.
How it works?
When a user enters your website name, it's sent to the DNS service (in this case, Route 53). This service then translates the website name into an IP address. Then, it replies back to the user's browser with the IP. Assuming it's valid, the user's browser then serves the website.
Exam Tips: Answering Questions on Domain Name System (DNS)
1. Learn about Route 53's routing policies: It's important to comprehend the difference between Simple, Weighted, Latency, Failover, and Geolocation Routing Policies and to understand how to implement them.
2. DNS record types: Understanding what A, AAAA, CNAME, and MX records are and when to use them will be beneficial while answering DNS-related questions.
3. Understand DNS hierarchy: Knowledge about how DNS hierarchy works, along with an understanding of root and TLD servers, SOA, and NS records, can help answer related questions.
4. Concept of DNS hostnames and domains: Understanding the difference between fully qualified domain names (FQDN), sub-domains and apex or root domains can help answer questions.
To summarize, a solid understanding of Route 53 and the DNS service will help you to decode DNS capabilities, answer DNS-related questions, and suggest architectures based on the requirement in the AWS Solution Architect Exam.
AWS Certified Solutions Architect - Amazon Route 53 Example Questions
Test your knowledge of Amazon Simple Storage Service (S3)
Question 1
A web application is hosted using an Amazon S3 static website. Users report that some images aren't loading properly. What could be the most probable cause?
Question 2
An organization using Amazon Route 53 needs to route end-user traffic to application instances closest to the user by geolocation. Which Route 53 routing policy should be used?
Question 3
A network administrator is troubleshooting a slow internal website hosted on the company's on-premise data center. They suspect that the internal DNS server is causing the issue. What should the network administrator focus on?
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