Route 53 Flashcards
In Route 53 What is an Alias Record?
- Alias records only exist within AWS.
- Maps resources to other AWS resources (like web servers to ELBs)
- “a type of record that you can create to route traffic to AWS resources.”
- Alias records, unlike CNAMES are available at the Zone Apex
What is a simple routing policy and what is the use case?
- One IP address with multiple IP addresses returned in a random order.
- Use this for something like a web server
What is a weighted routing policy and what is the use case? What about health checks?
- Allows you to split your traffic based on weight.
- If you have one larger server for example.
- you can incorporate health checks to rebalance the weighting until a failed one passes, and you can be notified of failed health checks.
What is a Failover routing policy and what is the use case?
- Health of a primary site is monitored, and a secondary one is used if there’s a failure
What is a Geolocation routing policy and what is the use case?
- Lets you route based on the location of the DNS origination
- all queries from Germany are pushed to German servers
What is a latency routing policy and what is the use case?
- Routing is based on the latency for the end-user.
- Gives the fastest response time
What is a multivalue answer routing policy and what is the use case?
- Same as simple routing but only returns healthy endpoints
What kind of a DNS record could you use to map example.com to an ELB
An alias A Record with the ELB as the target
How can you protect against man in the middle / DNS Spoofing attacks on DNS?
Endable DNSSEC
How is a Geoproximity Routing slightly different than a Geolocation Routing in Route 53?
Geoproximity can have a bias setting to grow or shrink the region from which traffic is routed to a resource, whereas geolocation routes to a resource based on origination
Geolocation lets you route based on the location of the users.
Geoproximity lets you route based on the location of resources
