Network devices

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

Repeater

• regenerate the signal over the same network before the signal becomes too weak or corrupted to extend the length to which the signal can be transmitted over the same network

Hub

• A hub is a basically multi-port repeater
• A hub connects multiple wires coming from different branches

Bridge

• Data Link (Layer 2) device
• A bridge is a repeater, with add on filtering content by reading the MAC addresses of the source and destination.

Router

• A router is a device like a switch that routes data packets based on their IP addresses.
• Routers connect 2 or more networks, each of which must have a unique network number in order for routing to be succesful
• Has many IPs, because has many NIC
• find the most efficient path for delivery of data on network

Switch

• Has no IP address, only MAC address

NIC

• NIC card is a layer 2 device
• network interface card is a network adapter that is used to connect the computer to the network.
• It is installed in the computer to establish a LAN.

Hub vs Switch vs Router

Features	Hub	Switch	Router
OSI layer	1	2	3
type	broadcast device	multicast device	routing device
connect devices	same network	same network	different networks
send data at same time	only 1 device	multiple devices	multiple devices
stored info	not any info	MAC addresses	IP addresses

Router vs Switch

Features	Router	Switch
speed	slower	faster
ISO layer	layer 3	layer 2
addressing used	IP	MAC
broadcasts	Blocks	Forwards
security	high	lower