Computer Networking Course- 2024 | Getting Started with Computer Networking
Computer Networking Part- 1
Table of contents
- What is Internet?
- The Internet is a global network of billions of computers and other electronic devices. With the Internet, it's possible to access almost any information, communicate with anyone else in the world, and do much more.
- Where internet came from?
- How do we access the internet?
- LAN - (local area network)
- MAN - (metropolitan area network)
- WAN - (Wide area network)
- Protocols:
- How are computers connected?
What is Internet?
The Internet is a global network of billions of computers and other electronic devices. With the Internet, it's possible to access almost any information, communicate with anyone else in the world, and do much more.
You can do all of this by connecting a computer to the Internet, which is also called going online. When someone says a computer is online, it's just another way of saying it's connected to the Internet.
Where internet came from?
Internet comes from under see, there are lots of submarine cable maps which connect to us with internet and also connect a country to another country.
How do we access the internet?
Physically- Optical fiber cable, coaxial cable.
Wireless- Bluetooth, wifi, 2G, 3G, 4G, 5G
LAN - (local area network)
it connects small house, offices, Ethernet, and wifi.
MAN - (metropolitan area network)
It spread across a city.
WAN - (Wide area network)
Across countries using optical fiber cable.
Protocols:
It is a rule that is define by the internet society
How are computers connected?
Topologies- A network topology is the physical and logical arrangement of nodes and connections in a network. Nodes usually include devices such as switches, routers and software with switch and router features.
1. Bus Topology- In this topology computers are connected like a backbone. See the following image.
Limitation- Horizontal line is linking to computers each other. If he got broken somehow so communication will also break down.
2. Ring Topology- In this topology computers communicate with each other.
**Limitation-**If Computer A wants to communicate with computer D then here it's creating unnecessary calls.
3. Star Topology- In this topology, It has one central device that's connected to all the computers.
**Limitation-**If the central device fails so communication will spoil.
4. Tree Topologie- it is similar to bus and star topologies mean in one single bus so many computers are connected.
5. Mesh Topologie- Every single computer will be connected to one another.
Limitation- This is very expensive because so much wire is used, .