Used to connect 2 or more networks eg router in your house connects to an Internet Service Provider
They are located at gateways or entry points to the network
They send packets of data between the two networks eg this is how the internet information comes into your house
Commonly has 2 or 4 or 8 ports
Used to connect many computers in a local area network (LAN)
Connects many computers in the LAN to a server
Used to send data within a local area network (LAN)
Commonly has 24 or 48 ports
Software that checks incoming data and stops dangerous data
Uses rules to 'filter out' this data
"It can't get past the firewall", complained the student.
A firewall can stop data based on IP addresses
Examples are Norton 360, Avast Internet Security, Intego VirusBarrier
A phone line connects to a modem, this connects the internet to the building.
Changes analogue (voice) to digital so it can go over the telephone line.
Changes the signal back from digital to analogue at the other end of the telephone line so we can hear it.
This change is called MOdulate/DEModulate
Is the hardware that connects a computer to a network
No NIC = no network
A wireless network interface card (WNIC) is common in laptops. These are usually USB/bluetooth types.
It is commonly attached to a wall and has an antenna to receive and send signals to laptops and smartphones
It sends these signals back to the server through a wired connection.
A WAP can handle anywhere from 10-50 devices connecting to it. Depending on type.
Is uses the MAC address to forward data between two ethernet LANs
It works by using the MAC address on each computer to send the data to.
A 2-port networking bridge may have LAN1 connected to its port 1, and LAN2 connected to its port 2.
For example a computer on LAN1 may send data to a computer in LAN2 and it will go through the bridge.
It builds a bridging table which gives mac addresses and ports for host connection.
Once the example above happens, a bridging table would record eg 00-97-78-AA-4D-5C and 00-26-23-C8-2A-5C on port 2.
The place where the internet comes into a network is a gateway example
Connects networks that use different protocols
Secure location with firewall, or proxy server, and other hardware such as routers
It controls data leaving the LAN and going to the internet AND coming back to the LAN
Is hardware that receives a signal, amplifies it and then sends it on.
It is used to increase the distance a signal can travel.