Network Devices

As far as I am concerned with

Repeater

1. A dumb, 2 port output device
2. Works at physical layer (OSI layer 1)
3. Transmits data between 2 devices only

Bridge

1. A slightly smarter Repeater
2. Works at layer 1, has 2 ports, connects 2 devices
3. Can filter data based on mac addresses

Hub

1. Works at Physical Layer i.e. OSI Layer 1
2. Contains multiple physical ports (assume multiple LAN cable points)
3. A dumb device, always broadcasts all data from one port to all other ports
4. No division of network
5. Only half-duplex transmission
6. For more info, visit GFG

Switches

1. Works at Data Link Layer i.e. OSI Layer 2
2. Switches can divide the network at data link layer using VLANS
3. Smart, uses MAC ids to identify source and destination
4. Full duplex, controls bandwidth used by individual LANs
5. More info on GFG

Routers

1. Works at Network (IP) Layer i.e. OSI Layer 3
2. Divides network based on IP subnets
3. A layer 3 switch = Router with VLAN (layer 2) capabilities
4. More info on GFG

Reference

1. https://www.geeksforgeeks.org/network-devices-hub-repeater-bridge-switch-router-gateways/