Introduction to Computer Architecture

System

A collection of components linked together and organized in such a way as to be recognizable as a single unit

Environment

Anyhting outside of the system

System Architecture

Fundamental properties and the patterns of relationships connection constraints and linkages among the components and between the system

Advantages of Client-Server Architecture

Centralization - easier administration of services, easier availability and location, consistency resources

Examples of Multi-Tier Architectures

Two-tier architecture, three-tier architecture, N-tier architecture

Two-tier architecture

Two computers involved in a service

Three-tier architecture

Three computers are involved in a service

Example of two-tier architecture

Web browser and web server

Example of three-tier architecture

Client computer, web server, database server

Infrastructure as a Service (IaaS)

Cloud-based hardware emulation of virtual machines and networking

Platform as a Service (PaaS)

Tools for a developer to create and run applications

Software as a Service

Applications run on a server or processingmay be divided on server and client

Name 5 advantages for cloud computing

- Client datacenter needs are simplified; reduced costs

- Supports collaboration

- Scalable to a variety of host platforms

- Reduced maintenance time

- Lower investment for short-term projects

Name 4 risks of cloud computing

- Quality of security is questionable

- Outages or loss of connectivity

- Requires long-term commitment and viability of cloud service

- Changes in operating procedures can result in data loss

Peer-to-Peer Computing

Computers on a network are treated as equals, and can share resources with othewr computers on the network

Give 4 disadvantages of Peer-to-Peer Computing

Difficulty to...

- Establish centralized control of services

- Locate services

- Synchronize versions of files or software

- Secure network from unauthorized access and from viruses

Advantage of Peer-to-Peer Computing

-Sharing files between computers