Ch 2 Communication (FULL) | AS Level CS | 9618

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Learn Networks and the Internet from Cambridge International AS Level Computer Science (9618, Paper 1 – Topic 2.1).
This video explains LANs, WANs, network models, topologies, hardware, transmission methods, and internet addressing — all with exam-focused clarity and real examples.

📌 What you’ll learn in this lesson:

✅ Networking Basics & Purpose

Why networking devices are used

Benefits of connected systems

✅ LAN vs WAN

Characteristics and key differences

When each is used

✅ Network Models

Client-server vs peer-to-peer

Roles, benefits, drawbacks

Choosing the right model

Thin-client vs thick-client

✅ Topologies

Bus, star, mesh, and hybrid

Packet transmission in each

Justifying topologies for scenarios

✅ Cloud Computing

Public vs private cloud

Advantages and drawbacks

✅ Wired vs Wireless Networks

Characteristics of:
• Copper cable
• Fibre optic
• Radio waves (WiFi)
• Microwaves
• Satellites

✅ LAN Hardware

Switches, servers

NICs and WNICs

Wireless Access Points

Cables, bridges, repeaters

Routers and their role

✅ Ethernet & Collisions

How Ethernet works

CSMA/CD and collision avoidance

✅ Bit Streaming

Real-time vs on-demand

Bit rate and broadband impact

✅ Internet vs WWW

Key differences

Hardware: modems, PSTN, dedicated lines, mobile networks

✅ IP Addressing

IPv4 vs IPv6

Subnetting and device association

Static vs dynamic IPs

Public vs private IPs + security implications

✅ URLs & DNS

How URLs locate resources

Role of the Domain Name System

✨ Perfect for AS students preparing for 9618 Paper 1, or anyone revising networking with exam-style structure and explanation.