ITSS 3300 Lec. 6

Cloud Computing

delivery of computing services over the internet on demand, without direct active management by the user, rather than relying only on local servers

Infrastructure as a Service (IaaS)

Provides virtualized computing resources such as servers, storage, and networks (AWS)

Platform as a Service (PaaS)

Offers a platform with tools to develop, run, and manage applications without managing infrastructure (Google App Engine)

Software as a Service (SaaS)

Software over the internet usually by subscription (Microsoft 365)

3 Cloud Computing Types

1. Infrastructure as a Service (IaaS)

2. Platform as a service (PaaS)

3. Software as a service (Saas)

3 Types of Cloud Computing Models

1. Public Cloud

2. Private Cloud

3. Hybrid Cloud

Public Cloud

Resources over the internet to anyone - netflix uses AWS to stream globally

Private Cloud

Owned/operated by ONE organization within its own infrastructure to ensure compliance - JPMorgan Chase’s own data centers

Hybrid Cloud

Public + Private connected; scalability of public while keeping sensitive data under control - Coca-Cola, Azure for customer-facing apps and sensitive data on private data centers

Evolution of Computing

Mainframe (60s-80s) → Client-server (90s-00s) → Cloud (00s-current)

Mainframe (1960s-1980s) - before internet

large scale, high speed, centralized computers for internal data processing needs

Client-Server (1990s-2000s) - after the internet

Allows clients to send requests across the internet to servers and servers respond to requests by sending data back to clients

Cloud Computing (2000s-current) - business began moving 2008

allows employees and customers to access organizational data and applications located in cloud

Cloud is defined as ________

elastic leasing of pooled computer resources over the internet

Elastic = scale resources up/down dynamically with demand.

Pooled = shared groups of many resources.

Advantages of moving to Cloud

• no need to purchase

• cheap processors

• internet-based

• access anytime, anywhere

• reduced costs

• improve scalability and flexibility

Content Delivery Network (CDN)

system of hardware and software that stores user data in several geographic locations and makes it available on demand

CDN Benefits

• decreased load time

• reduce load on origin server

• increase reliability

• protection from cyber attacks

• reduced delivery costs for mobile users

3 major cloud computing providers

1. Amazon Web Services (AWS) - 61%

2. Microsoft Azure - 52%

3. Google Cloud - 19%

Computer Networks

collection of computers that communicate over transmission lines or wirelessly

Personal Area Network (PAN)

around one person; cm/in to a few m/ft

ex. bluetooth

• convenient

• low power

• limited range

• interference

Local Area Network (LAN)

Single physical site: home, office, building

ex. devices at home

• resource sharing

• high speed

• centralized data

• limited geographic data

• security risk

Wide Area Network (WAN)

connects LANs across cities, countries, continents

ex. bank w/ offices and ATMs, internet (most common)

• long distance connectivity

• scalability

• costly

• latency (delays over distance)

• needs security(encryption, VPNs)

Internet

Global network of billions of devices

ex. email, google, amazon

• access to information

• global connectivity

• privacy/security risks

• cybercrime

• addiction

4 basic types of networks

PAN, LAN, WAN, Internet

Intranet

Private network within a company for securely sharing information and communicating with employees

ex. airline employee intranet

• enhanced communication

• increase productivity

• maintenance expertise

• hard to ensure engagement

• security risks

The Internet vs. internets

The Internet is a single global network using standard protocols (TCP/IP)

(transmission control protocol/internet protocol)

internets refers to multiple interconnected networks (public or private) using the same protocols

ex. a company w/ several private internets connected to each other by not exposed to the public internet.

Virtual Private Network (VPN)

encrypted connection over the Internet from a device to a network

• masks your IP address and encrypts traffic

• enables remote work

• safely transmits sensitive data

• prevent interception

VPN creates______

secure tunnel between VPN routers across the Internet