3-Tier Auto-scalable Web Application Architecture

"A web application or web app is any application software that runs in a web browser or is created in a browser-supported programming language (such as the combination of JavaScript, HTML and CSS) and relies on a common web browser to render the application. ... Applications are usually broken into logical chunks called "tiers", where every tier is assigned a role. ...
For more complex applications, a 3-tier solution may fall short, and it may be beneficial to use an n-tiered approach, where the greatest benefit is breaking the business logic, which resides on the application tier, into a more fine-grained model. Another benefit may be adding an integration tier that separates the data tier from the rest of tiers by providing an easy-to-use interface to access the data. For example, the client data would be accessed by calling a "list_ clients()" function instead of making an SQL query directly against the client table on the database. This allows the underlying database to be replaced without making any change to the other tiers." [Web application. Wikipedia]
The AWS architecture diagram example "3-Tier Auto-scalable Web Application Architecture" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the AWS Architecture Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.

The vector stencils library "AWS Security, Identity and Compliance" contains 25 Amazon Web Services security, identity and compliance icons.
Use it to draw AWS architecture diagrams with ConceptDraw PRO software.
Amazon Security, Identity and Compliance services includes: "Amazon Cloud Directory (Create flexible cloud-native directories), AWS Identity & Access Management (Manage User Access and Encryption Keys), Amazon Inspector (Analyze Application Security), AWS Certificate Manager (Provision, Manage, and Deploy SSL/ TLS Certificates), AWS CloudHSM (Hardware-based Key Storage for Regulatory Compliance), AWS Directory Service (Host and Manage Active Directory), AWS Key Management Service (Managed Creation and Control of Encryption Keys), AWS Organizations (Policy-based management for multiple AWS accounts), AWS Shield (DDoS Protection), AWS WAF (Filter Malicious Web Traffic)" [aws.amazon.com]
The AWS icons example "Design elements - AWS Security, Identity and Compliance" is included in the AWS Architecture Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.

"The iPhone ... is a line of smartphones designed and marketed by Apple Inc. It runs Apple's iOS mobile operating system. ...
The interface is based around the home screen, a graphical list of available applications. iPhone applications normally run one at a time. Starting with the iPhone 4, a primitive version of multitasking came into play. Users could double click the home button to select recently opened. However, the apps never ran in the background. Starting with iOS 7, though, apps can truly multitask, and each open application runs in the background when not in use, although most functionality is still available when making a call or listening to music. The home screen can be accessed at any time by a hardware button below the screen, closing the open application in the process.
By default, the Home screen contains the following icons: Messages (SMS and MMS messaging), Calendar, Photos, Camera, YouTube, Stocks, Maps (Google Maps), Weather, Voice Memos, Notes, Clock, Calculator, Settings, iTunes (store), App Store, (on the iPhone 3GS and iPhone 4) Compass, FaceTime and GameCenter were added in iOS 4.0 and 4.1 respectively. In iOS 5, Reminders and Newsstand were added, as well as the iPod application split into separate Music and Videos applications. iOS 6 added Passbook as well as an updated version of Maps that relies on data provided by TomTom as well as other sources. iOS 6 also added a Clock application onto the iPad's homescreen. However, it also no longer support YouTube. Docked at the base of the screen, four icons for Phone, Mail, Safari (Internet), and Music delineate the iPhone's main purposes." [iPhone. Wikipedia]
The example "iPhone OS (iOS) graphic user interface (GUI) - SMS application" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Graphic User Interface solution from the Software Development area of ConceptDraw Solution Park.

Use this template to prototype and design the iPhone user interface.
"At WWDC 2007 on June 11, 2007, Apple announced that the iPhone would support third-party web applications using Ajax that share the look and feel of the iPhone interface. On October 17, 2007, Steve Jobs, in an open letter posted to Apple's "Hot News" weblog, announced that a software development kit (SDK) would be made available to third-party developers in February 2008. The iPhone SDK was officially announced and released on March 6, 2008, at the Apple Town Hall facility.
It is a free download, with an Apple registration, that allows developers to develop native applications for the iPhone and iPod Touch, then test them in an "iPhone simulator". However, loading an application onto a real device is only possible after paying an Apple Developer Connection membership fee. Developers are free to set any price for their applications to be distributed through the App Store, of which they will receive a 70% share.
Developers can also opt to release the application for free and will not pay any costs to release or distribute the application beyond the membership fee. The App Store was launched with the release of iOS 2.0, on July 11, 2008. The update was free for iPhone users; owners of older iPod Touches were required to pay US$10 for it.
Once a developer has submitted an application to the App Store, Apple holds firm control over its distribution." [iPhone. Wikipedia]
The iPhone interface template for the ConceptDraw PRO diagramming and vector drawing software is included in the Graphic User Interface solution from the Software Development area of ConceptDraw Solution Park.

This Azure cloud architecture pattern diagram template was created on the base of figure in the article "Valet Key Pattern" from the Microsoft Developer Network (MSDN) website.
"Valet Key Pattern.
Use a token or key that provides clients with restricted direct access to a specific resource or service in order to offload data transfer operations from the application code. This pattern is particularly useful in applications that use cloud-hosted storage systems or queues, and can minimize cost and maximize scalability and performance. ...
Client programs and web browsers often need to read and write files or data streams to and from an application’s storage. ...
Data stores have the capability to handle upload and download of data directly, without requiring the application to perform any processing to move this data, but this typically requires the client to have access to the security credentials for the store.
... applications must be able to securely control access to data in a granular way, but still reduce the load on the server by setting up this connection and then allowing the client to communicate directly with the data store to perform the required read or write operations. ...
To resolve the problem of controlling access to a data store where the store itself cannot manage authentication and authorization of clients, one typical solution is to restrict access to the data store’s public connection and provide the client with a key or token that the data store itself can validate.
This key or token is usually referred to as a valet key. It provides time-limited access to specific resources and allows only predefined operations such as reading and writing to storage or queues, or uploading and downloading in a web browser. Applications can create and issue valet keys to client devices and web browsers quickly and easily, allowing clients to perform the required operations without requiring the application to directly handle the data transfer. This removes the processing overhead, and the consequent impact on performance and scalability, from the application and the server." [msdn.microsoft.com/ ru-RU/ library/ dn568102.aspx]
The Azure cloud system architecture diagram template "Valet key pattern" for the ConceptDraw PRO diagramming and vector drawing software is included in the Azure Architecture solutin from the Computer and Networks area of ConceptDraw Solution Park.

This wheel diagram sample was created on the base of figure illustrating the webpage "Chapter 3: Current State of the Ecosystem" of the website of the National Broadband Plan of US Federal Communications Comission (FCC). "The broadband ecosystem includes applications and content: e-mail, search, news, maps, sales and marketing applications used by businesses, user-generated video and hundreds of thousands of more specialized uses. Ultimately, the value of broadband is realized when it delivers useful applications and content to end-users.
Applications run on devices that attach to the network and allow users to communicate: computers, smartphones, set-top boxes, e-book readers, sensors, private branch exchanges (PBX), local area network routers, modems and an ever-growing list of other devices. New devices mean new opportunities for applications and content.
Finally, broadband networks can take multiple forms: wired or wireless, fixed or mobile, terrestrial or satellite. Different types of networks have different capabilities, benefits and costs.
The value of being connected to the network increases as more people and businesses choose to adopt broadband and use applications and devices that the network supports. Several factors contribute to their decisions. These include whether they can afford a connection, whether they are comfortable with digital technology and whether they believe broadband is useful.
Networks, devices and applications drive each other in a virtuous cycle. If networks are fast, reliable and widely available, companies produce more powerful, more capable devices to connect to those networks. These devices, in turn, encourage innovators and entrepreneurs to develop exciting applications and content. These new applications draw interest among end-users, bring new users online and increase use among those who already subscribe to broadband services. This growth in the broadband ecosystem reinforces the cycle, encouraging service providers to boost the speed, functionality and reach of their networks."
[broadband.gov/ plan/ 3-current-state-of-the-ecosystem/ ]
The circle pie chart example "Forces shaping the broadband ecosystem in the US" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Target and Circular Diagrams solution from the Marketing area of ConceptDraw Solution Park.
www.conceptdraw.com/ solution-park/ marketing-target-and-circular-diagrams