← Computer Networks learning pathComputer Networks · Module 7 of 10
Network devices and wireless
Know switches, routers, access points and Wi-Fi.
📖 Key ideas
- Hub (old) broadcasts to all ports; switch forwards to the right port.
- Router connects networks and chooses paths.
- Access points provide Wi-Fi.
- Firewalls filter traffic.
- Wi-Fi bands: 2.4 GHz (range), 5/6 GHz (speed).
💡 Real-life example: A hub shouts to everyone in the room; a switch whispers only to the right person.
HubRepeats data to all ports
SwitchForwards frames to correct port
Access pointProvides wireless access
Frequency bandWi-Fi radio range like 2.4 GHz