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update readme #4

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Lusitaniae Mar 13, 2018
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Lusitaniae Mar 13, 2018
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Lusitaniae Mar 13, 2018
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10 changes: 6 additions & 4 deletions README.md
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Expand Up @@ -562,7 +562,7 @@ Using Access Key ID and Secret Access Key – can be used only via accessing pro

- Restrict viewer access for S3 and CDN using pre-Signed URLs or Signed cookies. E.g. You can view video only using that URL

- Using Web Application Firewalls to prevent SQL injection, CSS attacks
- Using Web Application Firewalls to prevent SQL injection, XSS attacks

- For https access, you can either use default CloudFront certificate or own certificate can be imported via ACM.

Expand Down Expand Up @@ -1029,7 +1029,7 @@ e.g. [https://www.tcpiputils.com/dns-lookup/google.com/ALL](https://www.tcpiputi

Most of the questions are scenario based.

1. Simple - Default - when a single resource performs function for your domain - only one webserver serves content
1. Simple - Default - When you have a single resource available or wish to use DNS round robin between available resources.

2. Weighted – send x% of traffic to site A and remainder (100 – x) % of it to site B. Need not be two different regions. Can be even two different ELBs. This split is over length of day not based on number of individual subsequent requests.

Expand All @@ -1049,6 +1049,8 @@ How will the users get the best experience? – evaluated dynamically by R3.

5. Geo-location – Choose where to route traffic based on geographic location of users.

6. Traffic Flow - Visually create complex set of dns records based on all the options above.

Different from Latency based as the routing is hardwired irrespective of latency.

## DNS Exam Tips
Expand Down Expand Up @@ -1163,7 +1165,7 @@ OLTP systems.

- In case of failover, No need to change connection string.

- This can be used for DR purpose only. This option has to be selected at instance creation time. This option is not useful for improving performance / scaling.
- Can be used for DR purposes only. Does not improve performance / scaling.

### Read Replica Databases.

Expand Down Expand Up @@ -1201,7 +1203,7 @@ OLTP systems.

- Stored on SSDs

- Stored on 3 geographically distinct DCs (not AZs). Built in redundancy
- Built in redundancy, data is replicated across 3 Availability Zones.

- Consistency

Expand Down