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5.2.a [i] VACL, PACL – Part 1

July 21, 2018 at 2:06 am
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Classic Three Tier Architectures in AWS

July 20, 2018 at 4:21 pm

AWS Three Tier

Note that the three-tier architecture consists of the following:

  • Presentation tier – consists of the components that users interact with; this might include web pages and/or mobile app user interface components
  • Logic-tier – contains the code required to translate user actions initiated at the presentation tier to the functionality required by the application
  • Data-tier – consists of storage media that hold the data relevant to the application architecture; this might be a database, object stores, caches, or file systems

AWS offers many technologies to assist with the presentation tier of your architecture. The Amazon Cognito service can assist with the creation and management of user identities. S3 might be the source of any static Web content you need to store and the deliver for the tier. The API Gateway can be enabled for cross-origin resource sharing compliant. This permits web browsers to invoke APIs from within your static web pages.

You can consider the logic tier to be the “brains” of the architecture. This certainly lends itself to the power of the API Gateway and Lambda functionality. They combine to allow a revolutionary new serverless approach to the multi-tier architecture. Thanks to advantages that come with serverless implementations, new levels of high availability, scalability, and security are possible. While a more traditional server-based implementation of the three-tier architecture might require thousands of servers in order to scale, a serverless environment does not need a single virtual server in its operation.

The data tier of your architecture can be utilized with a wide variety of AWS solutions. We often organize these into two broad categories. Amazon VPC-hosted data stores and IAM-enabled data stores. VPC-hosted data store options include:

  • RDS – several relational database engine options here
  • ElastiCache – boost performance with in-memory caching
  • Redshift – simple data warehousing capabilities
  • EC2 – data stored within technology offered by an EC2 instance(s)

IAM-enabled options include:

  • DynamoDB – an infinitely scalable NoSQL database
  • S3 – infinitely scalable object-based storage
  • Elastisearch Service – a managed version of the popular search and analytics engine called Elastisearch

ACLs on Switches

July 19, 2018 at 7:22 pm
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5.2.a [ii] Stormcontrol

July 17, 2018 at 8:02 pm
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Network+ N10-007 Filtering with ACLs

July 17, 2018 at 5:43 pm

Enjoy this Nugget from the 2018 Network+ course from CBT Nuggets! This course is amazing as it features myself, Keith Barker, Network Chuck, and Jemery Cioara!


The High Low Game – Part 2 – STP

July 16, 2018 at 11:24 pm
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Juniper iBGP Peering Example

July 16, 2018 at 11:10 pm

This Sneak Peek Nugget is from my BGP – Peering module at CBT Nuggets. This is one module of three on BGP that are currently complete and live on CBT Nuggets. These modules consist of many videos that provide detailed coverage on BGP with both Cisco and Juniper examples.