Summary of "Computer Networking Explained | Cisco CCNA 200-301"

Overview

This is an introductory, CCNA-level overview of computer networking from CertBros. The lesson defines what a computer network is, explains common network devices and topologies (home, business, cellular), and outlines why networks matter (resource sharing and internet services). It is the first module in a full Cisco CCNA 200-301 course and promises more detailed networking lessons later.

Introductory module from the CertBros CCNA 200-301 course. See the video description for the full course link.

What is a network?

A network is a system of interconnected computers and devices that can communicate and share resources. Networks range in size from a small home LAN to the global internet (the largest WAN).

Common devices and components

Desktops and laptops
Servers and centralized file systems
Printers (shared via the network)
Switches (connect devices on a local network)
Routers (connect different networks and route traffic)
Wireless access points (APs)
Phones and VoIP devices
Smart/IoT devices (phones, tablets, security cameras, smart lights, etc.)

Home network setup

Typical home setups contain: - A switch, a router, and a wireless AP plus PCs and phones. - Note: in most consumer routers the switch and wireless AP are integrated into a single device.

LAN vs WAN

LAN (Local Area Network): a network contained within a single area, such as a home or office.
WAN (Wide Area Network): connects separate LANs across larger geographic areas. The internet is the largest WAN; businesses may also operate private WANs to connect sites.

Business network layout

Workstation network cables plug into wall/floor sockets at each desk.
Those cables run through the building’s structured wiring to a wiring closet, patch room, or server room.
Devices in the wiring closet connect to rack-mounted switches.
Multiple wiring closets (across floors or buildings) interconnect to form the larger business network.

Cellular networks

Cellular (3G/4G/5G) networks are large wireless networks that use towers and radio access to provide mobile connectivity. Connection quality depends largely on proximity to towers and network capacity.

Why networks are used

Resource sharing
- Shared printers and centralized file servers
- Easy file transfer between users
Internet-enabled services
- Web search, email, messaging
- VoIP (telephone over the internet)
- Hosted computing and cloud services
- Streaming (YouTube, media services)
Societal impact
- Enables modern communication and broad access to global information

Course and source

This video is an introductory module in a full Cisco CCNA 200-301 course (link referenced in the video description).
The presenter and source: CertBros (video host).