Chapter 1: Introduction to Networks

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Chapter 1: Network Fundamentals

A Computer Network is a set of devices (computers, servers, phones) connected together to share resources like files, printers, or internet access.

  • LAN (Local Area Network): Covers a small area like a home or office. High speed.
  • WAN (Wide Area Network): Covers large areas (Cities, Countries). The Internet is the biggest WAN.

> Network Topologies (Interactive)

Click a topology to see how data flows!

BUS TOPOLOGY

Single cable. If cut, network fails.

STAR TOPOLOGY

Central Switch. Most common today.

RING TOPOLOGY

Token passing. No collisions.

> The OSI Model (Quick Ref)

LayerNameData Unit (PDU)
7ApplicationData
6PresentationData
5SessionData
4TransportSegment (TCP) / Datagram
3NetworkPacket
2Data LinkFrame
1PhysicalBit

> Chapter Review Exam

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