System Architecture and Network Considerations Study Notes (copy)

FROM SUBJECT SAD

What is System Architecture?

The overall design defining interactions between hardware and software components to perform information system functions.

What are the key components of System Architecture?

Client, Server, Database, and Application.

What is the importance of System Architecture?

It improves performance and security, simplifies maintenance, increases reliability, and supports scalability for future expansion.

What does a Client do in System Architecture?

It is a device or application used by end users to access the system.

What role does a Server play in System Architecture?

It provides services, processes requests, and stores resources.

What is One-Tier Architecture?

All components exist on a single computer.

What defines Two-Tier Architecture?

Clients communicate directly with a central database server.

What is Three-Tier Architecture?

It separates responsibilities into distinct layers, commonly used for web/enterprise systems.

What is the Presentation Layer in Three-Tier Architecture?

It displays information such as Login pages and Dashboards.

What is an example of a Monolithic architectural style?

A single, unified application.

What does Microservices architecture entail?

The application is broken down into small, independent services.

What are the objectives of Network Architecture?

Reliable communication, fast transmission, secure access, high availability, and support for future growth.

What is the purpose of a Router in a network?

It connects different networks.

What does a Firewall do?

It filters and protects network traffic.

What is a LAN?

A Local Area Network that covers a small area.

What is a WAN?

A Wide Area Network that connects multiple geographic locations.

What does Layer 7 of the OSI model represent?

The Application layer providing network services for users/applications.

What is the function of Layer 4 in the OSI model?

Reliable data transfer with error checking and flow control.

What is meant by Scalability in Network Design?

The ability to handle growth, such as expanding from 2,000 to 10,000 users.

What are some security measures in network design?

Firewalls, VPNs, antivirus, encryption, user authentication, and multi-factor authentication.

What does Backup & Disaster Recovery include?

Daily database backups, off-site storage, and recovery planning.

What is the Interaction Flow in a system?

Users → Client Devices → Network Infrastructure → Web/Application Server → Database Server → Stored Information.