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Clarify Availability Zone separation (#422)

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* Clarified AZ features

* Added changes suggested by @jlevy
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Corey Quinn 2017-04-26 16:38:02 -07:00 committed by Thanos Baskous
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README.md
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@ -270,7 +270,7 @@ We’ve assembled a landscape of a few of the services. This is far from complet
### Common Concepts
- 📒 The AWS [**General Reference**](https://docs.aws.amazon.com/general/latest/gr/Welcome.html) covers a bunch of common concepts that are relevant for multiple services.
- AWS allows deployments in [**regions**](https://docs.aws.amazon.com/general/latest/gr/rande.html), which are isolated geographic locations that help you reduce latency or offer additional redundancy (though typically availability zones are the first tool of choice for [high availability](#high-availability)).
- AWS allows deployments in [**regions**](https://docs.aws.amazon.com/general/latest/gr/rande.html), which are isolated geographic locations that help you reduce latency or offer additional redundancy. Regions contain availability zones(AZs), which are typically the first tool of choice for [high availability](#high-availability)). AZs are [physically separate from one another](https://www.youtube.com/watch?v=JIQETrFC_SQ&feature=youtu.be&t=1428) even within the same region, and [may span multiple physical data centers](https://blog.rackspace.com/aws-101-regions-availability-zones). While they are connected via low latency links, natural disasters afflicting one should not affect others.
- Each service has API **endpoints** for each region. Endpoints differ from service to service and not all services are available in each region, as listed in [these tables](https://docs.aws.amazon.com/general/latest/gr/rande.html).
- [**Amazon Resource Names (ARNs)**](https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html) are specially formatted identifiers for identifying resources. They start with 'arn:' and are used in many services, and in particular for IAM policies.