ppt 1

Module 1: Networking Today

1.1 Networks Affect Our Lives

- Communication is essential to modern life, similar to air, water, food, and shelter.

- Networks connect people globally, enabling seamless communication and interaction.

- The Cisco Networking Academy helps individuals understand and utilize technology to improve the world.

1.2 Network Components

- Host Roles: Every computer on a network is called a host or end device.

- Servers: Provide information to end devices (e.g., web, email, file servers).

- Clients: Request and retrieve information from servers.

- Peer-to-Peer Networks: A network where devices can act as both client and server, suitable for small-scale use.

- End Devices: Devices where data originates and terminates.

- Intermediary Devices: Devices like routers, switches, and firewalls that manage and direct data flow.

- Network Media: Mediums like cables and wireless connections that enable data transmission.

1.3 Network Representations and Topologies

- Network Representations: Diagrams that visually depict network structure.

- Physical topology: Shows physical locations and cabling.

- Logical topology: Displays device connections and data flow.

1.4 Common Types of Networks

- Network Sizes: Ranges from small home networks to global networks (Internet).

- LAN (Local Area Network): Covers a small geographic area.

- WAN (Wide Area Network): Covers a large geographic area.

- Internet: A collection of interconnected LANs and WANs.

- Intranet: Private network accessible only to an organization’s members.

- Extranet: A restricted network allowing external users limited access.

1.5 Internet Connections

- Home and Small Office Connections: Include broadband, DSL, and mobile networks.

- Business Connections: Require higher bandwidth and dedicated services.

- Converging Networks: Combine data, voice, and video services into a single network.

1.6 Reliable Networks

- Network Architecture: Essential characteristics include:

- Fault Tolerance: Ensures minimal impact of network failures.

- Scalability: Allows growth without performance issues.

- Quality of Service (QoS): Prioritizes network traffic for efficiency.

- Security: Protects data integrity, confidentiality, and availability.

1.7 Network Trends

- BYOD (Bring Your Own Device): Employees use personal devices for work.

- Online Collaboration: Tools like WebEx enable remote teamwork.

- Video Communication: Video calls and conferencing enhance collaboration.

- Cloud Computing: Stores data remotely and provides on-demand services.

- Smart Home Technology: Integrates everyday appliances into networked systems.

- Powerline Networking: Uses electrical wiring for network connectivity.

- Wireless Broadband: Alternative to wired connections, especially in remote areas.

1.8 Network Security

- Threats:

- External: Viruses, malware, denial-of-service attacks.

- Internal: Insider threats, accidental misuse.

- Security Solutions:

- Home Networks: Antivirus software, firewalls.

- Large Networks: Firewalls, VPNs, intrusion prevention systems.

1.9 The IT Professional

- CCNA Certification: Demonstrates networking expertise and prepares professionals for new technologies.

- Networking Jobs: Cisco Networking Academy provides resources for career opportunities.

This guide ensures a comprehensive understanding of networking concepts covered in the module.