Computer Science · Theme A: Concepts of computer science

A2.1 — Network fundamentals

Computer Science · SL / HL · syllabus-mapped notes

1. CS_A2.1.1

   Purpose and characteristics of networks

   LAN, WAN, PAN and VPN, and what each is for.

2. CS_A2.1.2

   Modern digital infrastructures

   Purpose, benefits and limits of the internet, cloud, distributed and edge computing, and mobile networks.

3. CS_A2.1.3

   Network devices

   Gateways, firewalls, modems, NICs, routers, switches and access points, and their TCP/IP layers.

4. CS_A2.1.4

   Transport and application protocols

   TCP, UDP, HTTP, HTTPS and DHCP and what each does.

5. CS_A2.1.5

   The TCP/IP model

   The four layers and how they interact for reliable data transmission.