Route 53 - DNS Flashcards
What is Amazon Route 53?
Amazon Route 53 is a highly available, scalable, fully managed, and authoritative DNS service.
What does “authoritative” mean in the context of Route 53?
It means customers can update DNS records and have full control over the DNS.
How does Route 53 map domain names to IP addresses?
Route 53 uses DNS records in a hosted zone to map domain names like example.com to IP addresses such as 54.22.33.44.
What additional service does Route 53 provide?
Route 53 acts as a domain registrar, allowing users to register domain names.
What are DNS records, and what information do they contain in Route 53?
DNS records define how traffic is routed to a domain and contain information such as the domain name, record type (e.g., A, AAAA, CNAME, NS), value (e.g., IP address), routing policy, and TTL (time to live).
What does an A record do?
An A record maps a hostname to an IPv4 address, such as example.com to 1.2.3.4.
What does a AAAA record do?
An AAAA record maps a hostname to an IPv6 address.
What are NS records in Route 53?
NS records specify the name servers for a hosted zone that can respond to DNS queries for the domain.
What is a hosted zone in Route 53?
A hosted zone is a container for DNS records that define how traffic is routed to a domain and its subdomains.
What are the two types of hosted zones in Route 53?
Public hosted zones (for public domains) and private hosted zones (for internal resources in a VPC).
What is the purpose of a public hosted zone?
A public hosted zone allows DNS queries from the internet for public domains, such as example.com.
What is the purpose of a private hosted zone?
A private hosted zone resolves private domain names within a VPC, such as api.example.internal.
How much does it cost to use Route 53?
Hosted zones cost $0.50 per month, and registering a domain starts at $12 per year.
How does Route 53 ensure high availability?
Route 53 is the only AWS service with a 100% availability SLA.
