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