Introduction to Networks Overview

Aug 8, 2024

Introduction to Networks - Module 1 - Cisco Network Academy (CCNA)

Overview

  • First video in a series based on Cisco NetAcad Introduction to Network course
  • Covers Module 1 of CCNA: Introduction to Networks
  • Topics include how networks affect our lives, network components, network representations and topologies, common types of networks, internet connections, reliable networks, network trends, network security, and IT professional opportunities

How Networks Affect Our Lives

  • Communication essential, especially during COVID-19 pandemic
  • Increased reliance on network systems for remote work
  • Networks allow global connectivity and create human networks

Network Components

  • Host Roles
    • Hosts or end devices: computers on a network
    • Servers: provide information to end devices (email, web, file servers)
  • Client-Server Model
    • Server software runs on dedicated computers (servers)
    • Clients request information from servers
  • Peer-to-Peer Networks
    • No central control, less secure, and not scalable
  • End Devices
    • Originate or receive messages, e.g., computers, smartphones
  • Intermediary Devices
    • Manage data flow through the network: switches, routers, firewalls
  • Network Media
    • Medium for data transmission: metal wires, fiber optics, wireless

Network Representations and Topologies

  • Network Diagrams (Topology Diagrams)
    • Symbols represent devices within a network
    • Physical Topology: shows physical location of devices
    • Logical Topology: shows devices, ports, and addressing schemes

Common Types of Networks

  • Small Home Networks: connect a few computers and devices
  • SOHO Networks: connect home/remote office to corporate network
  • Medium to Large Networks: interconnect multiple locations
  • Worldwide Networks: connect global companies and the internet
  • LAN (Local Area Network)
    • Small geographical area, high-speed bandwidth
  • WAN (Wide Area Network)
    • Large geographical area, often slower than LAN

Internet Connections

  • Home and Small Office: cable, DSL, cellular, satellite, dial-up
  • Business: dedicated lease lines, Ethernet WAN, business DSL, satellite
  • Broadband: high-speed, always-on internet connection

Reliable Networks

  • Characteristics
    • Fault Tolerance: limits impact of failures, provides redundancy through packet switching
    • Scalability: expand quickly without impacting performance
    • Quality of Service (QoS): prioritizes time-sensitive data (e.g., voice, video)
    • Security: protects network infrastructure and data

Network Security

  • Security Threats
    • External: viruses, worms, spyware, denial of service, data theft
    • Internal: lost/stolen devices, accidental misuse, malicious insiders
  • Security Solutions
    • Anti-virus, anti-spyware, firewalls, access control lists, VPNs
  • Goals of Network Security
    • Confidentiality, Integrity, Availability

Network Trends

  • Bring Your Own Device (BYOD)
  • Online Collaboration
  • Video Communication
  • Cloud Computing
    • Public, Private, Hybrid, and Custom clouds

IT Professional Opportunities

  • Cisco Certifications: CCNA, CCNP
  • Skills: foundational technologies, IP foundation, security, wireless, virtualization, automation, network programmability
  • Job Search: NetAcad website, Talent Bridge Matching Engine

Conclusion

  • Networks are essential for modern communication
  • Understand different network components, topologies, and types
  • Stay updated with networking trends and security measures
  • Cisco certifications validate network skills and knowledge