Get started with Wireshark using this Wireshark tutorial for beginners that explains how to track network activity, tcp, ip and http packets. You will also see how to eardrops on username and password from unsecure websites.

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If you're new to Networking be sure to visit my channel to watch my Networking Tutorial which will give you an introduction to e.g.

Different devices
Hub
Switch
Router
Repeater

Hub
Receives data / sends to everyone
Computers decide to accept / Reject

Switch
a smart Hub
Track port usage using MAC

Repeater
Increase Signal
Amplify (Power Only)
Singal regeneration (Clean up signal)

Router
Move data across different Networks
Manage traffic flow
Has built in firewalls
Has public / private IP
DHCP server built in.