Computer Network:
Computer Network:
A computer network is a digital telecommunication network that provide connectivity between 2 or more devices to share resources.
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Client:
Client:
A client is device that access services and functions form server.
Example: Phone, Computer, Laptop, Printer👇
📱🖥️💻🖨️ etc...
Server:
Server:
Server is a device that provides services and function to the client.
NOTE: Some devices can be a client in some cases or can be a server.
Client and Server:
Client and Server:
They both build a connect between each other to share resources.
Switch:
Switch:
Switch is a device that provide connectivity between devices within local area.
Switches have may interfaces/ports for end host to connect devices(usually 24+).
Provide connectivity to hosts within the same LAN.
Do not provide connectivity LAN and Internet.
Example: CISCO Catalyst 9200, CISCO Catalyst 3650
CISCO Catalyst 9200 series switch
CISCO Catalyst 3650 series switches
Router:
Router:
Router is a device that provides connectivity between LANs and the Internet.
Router have fewer network interfaces the switches.
Router are used to provide connectivity between LANs.
Routers are used to provide connectivity between a LAN and the Internet.
Firewall:
Firewall:
Firewall is a device that monitor and control network traffic based on configured rules.
Firewall can be inside the network or outside the network.
If firewall include more modern and advanced filtering capability they called Next Generation firewalls.
Types of firewalls:
Types of firewalls:
Two types of firewalls are available
Network Firewall
Software based firewall/host based firewalls
Network firewalls: They are hardware device that filter traffic between network.
Software based/host based firewalls: host based firewalls are installed in the device as a software that filter traffic entering and exiting a host machine like PC.
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