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Questions and Answers
What is the purpose of Time to Live (TTL) in a DNS record?
What is the purpose of an A record in DNS?
What is the main functionality of Alias records in AWS Route 53?
What are some common issues with TTL bad configuration?
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What is a common issue that can arise from improper configuration of CNAME and Alias records in AWS Route 53?
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What do records in a Public Hosted Zone in AWS Route 53 specify?
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What is the purpose of Private Hosted Zones in AWS Route 53?
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What type of records do Public Hosted Zones contain in AWS Route 53?
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Study Notes
DNS Records
- Time to Live (TTL) in a DNS record determines how long a DNS resolver caches a DNS query response before refreshing it from the authoritative DNS server.
- An A record in DNS maps a domain name to an IP address, allowing users to access a website or application using a human-readable domain name instead of a difficult-to-remember IP address.
- Alias records in AWS Route 53 act as an alias for a given DNS name, routing traffic to a CloudFront distribution or an Elastic Load Balancer, allowing for more flexibility and scalability in resource allocation.
DNS Configuration Issues
- Improper configuration of TTL can lead to caching issues, where updates to DNS records take too long to propagate, or changes are not reflected quickly enough.
- Improper configuration of CNAME and Alias records in AWS Route 53 can cause routing issues, where traffic is not directed to the intended resource, resulting in service disruptions or downtime.
AWS Route 53 Hosted Zones
- Records in a Public Hosted Zone in AWS Route 53 specify the DNS records for a publicly accessible domain, providing a way to manage DNS records for a domain in a single location.
- Private Hosted Zones in AWS Route 53 are used to create a private DNS system for internal resources, isolating internal DNS from external access and providing an additional layer of security.
- Public Hosted Zones in AWS Route 53 contain various types of records, including A records, CNAME records, Alias records, and more, which collectively manage the DNS routing for a domain.
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Description
Test your knowledge on AWS Route 53, a scalable and highly available DNS web service, and Records TTL, which defines the amount of time that a DNS record is cached. Learn about routing end users to Internet applications and the importance of TTL values.
