Networking Study Notes

Introduction to Networking

Overview

  • Module Code: CT043-3-1
  • Version: VE1
  • Importance of networking in modern life: crucial for communication, akin to air, water, food, and shelter.

Lesson Structure

  • Topics Covered:
    • How networks affect our lives
    • Network components, representations, and topologies
    • Comparing common types of networks
    • Internet connections, reliability, trends, and security
    • Opportunities in the IT networking field

Networks Affect Our Lives

  • Communication importance
  • Network connections: No boundaries; global community.

Network Components

Basic Definitions

  • Host: Every computer on a network.
  • Server: Provides information to end devices (e.g., email, web servers, file servers).
  • Client: Sends requests to servers (e.g., retrieves web pages).
    • Examples of Servers:
      • Email Server: runs email software accessed by clients.
      • Web Server: serves web pages accessed via browsers.
      • File Server: stores files accessible by clients.
Types of Networks
  • Peer-to-Peer Networks: Both clients and servers in small setups, not recommended for larger networks due to security and scalability issues.
    • Pros: Simple setup, no centralized admin.
    • Cons: Less secure, slower performance.
Intermediary Devices
  • Examples: Switches, routers, firewalls.
    • Functions:
      • Interconnect end devices
      • Manage data flow and regenerate signals
      • Maintain network pathway information and notify devices of errors.

Network Media

Types of Media Used in Networks

  • Metal wires: Use electrical impulses.
  • Fiber Optic: Use light pulses for communication.
  • Wireless Transmission: Modulation of electromagnetic waves for data transmission.

Network Representations and Topologies

Network Diagrams

  • Symbols used to illustrate network devices.
  • Define terms: Network Interface Card (NIC), Ports.
Physical vs Logical Topology Diagrams
  • Physical Topology: Where devices and cables are located.
  • Logical Topology: Addresses, devices, and connections conceptually.

Common Types of Networks

Network Sizes

  • Small Home Networks: Few devices, basic internet connection.
  • Small Office/Home Office (SOHO): Connects home or remote office to corporate network.
  • Medium to Large Networks: Hundreds to thousands of interconnected devices.
  • World Wide Networks: Vast networks (internet).
LAN vs WAN
  • LAN: Limited geographical area, faster speeds, managed by one organization.
  • WAN: Covers larger areas, typically slower connections, managed by service providers.

Internet Connections

  • Access Technologies: Examples include DSL, cable, cellular, and satellite.
  • Connection Types:
    • Corporate Connections: Require dedicated lines, higher bandwidth, managed services.
  • Converging Networks: Combination of data, voice, video within the same infrastructure.

Reliable Networks

Key Characteristics

  • Fault Tolerance: Limiting the impact of failures by incorporating multiple pathways.
  • Scalability: Ability to expand network easily.
  • Quality of Service (QoS): Ensuring proper service quality across different types of data traffic.
  • Security: Protecting data and preventing unauthorized access.
Three Goals of Network Security
  • Confidentiality: Ensure that only authorized users can access data.
  • Integrity: Data remains unaltered during transmission.
  • Availability: Ensure timely access to data for authorized users.

Network Trends

Current Trends Affecting Networking

  • BYOD (Bring Your Own Device): Users utilize personal devices for work.
  • Online Collaboration: Usage of tools like Cisco WebEx for teamwork and communication.
  • Video Communication: Essential for meetings and collaboration.
  • Cloud Computing: Storing data on cloud servers, accessible from anywhere.
    • Types of Clouds: Public, Private, Hybrid, and Custom.
  • Smart Home Technology: Integration of networking in everyday appliances.
  • Powerline Networking: Connecting to the network via household electrical wiring where traditional connections are limited.

Network Security

Security Threats

  • External Threats: Viruses, malware, denial of service, interception.
  • Internal Threats: Lost/stolen devices, employee misuse.

Security Solutions

  • Multi-layered security approach including:
    • Antivirus software
    • Firewalls
    • Intrusion prevention systems
    • Virtual private networks (VPN)

The IT Professional

Careers in Networking

  • CCNA Certification: Validates foundational knowledge and skills needed in networking.
  • Opportunities with Cisco and partners through Talent Bridge Matching Engine.